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+ of 2000 circuits found in the web Alarms and circuits related with safety Amplifying of audio potency and RF, video related, tv tranmistter, collection fm transmitter, microcontollers, 8051, pic programmers, alrmas circuits various schematics


Alarms and circuits related with safety
Amplifiers of audio potency and RF
Acquisition of data and logical circuits
Automotive and circuits related with cars
Solar energy
Filter
Power supply fixed and you adjusted
Games and stuff (circuits)
Illumination control circuits
Instruments of having supported test and measurement
Infrared
Laser transmission and power sources
LED related circuits
Medical and health instruments
Microcontrollers circuits, programmers and development boards
Miscellany of circuits
Miscellany of audio circuits
Modelism and remote control
Motor and controls in general
Music related circuits
PC and periferals
PDA interfaces
Audio Pre-amplifiers
Radiofrequency (also sees transmitters)
Telephony and intercommunication
Timers, oscillators, etc.
Transmitters FM, AM, radioamators, etc
Video circuitos related
Direct Links to the circuits, problems with broken links we inform! Good luck.
Alarms and security related circuits

  1. A Combination Lock
  2.  Residential Alarm
  3. Proximity alarm
  4. Enhanced 4 Digit Alarm Keypad
  5. Modular Burglar Alarm
  6. Electronic lock
  7. Electronic door codelock (PIC16F84)
  8. Moisture alarm
  9. Fridge door alarm
  10. Ultrasonic remote control & alarm system
  11. Sun - Up Alarm
  12. Wire loop alarm
  13. Digital entry lock
  14. Proximity switch
  15. Toxic Gas Detector
  16. LEVEL CROSSING
  17. Door knob alarm (PDF)
  18. Water seepage alarm (PDF)
  19. Micro-power over temperature alarm (PDF)
  20. Personal silent alarm system
  21. Active IR motion detector
  22. A Basic RF Transmitter for PIR Sensors
  23. PIR motion detector
  24. Simple alarm system
  25. Automatic door opener using PIC12C508
  26. Home security project
  27. 5 Zone alarm circuit
  28. Miniature loop alarm
  29. Novel Buzzer
  30. Gate alarm circuit
  31. Modular Burglar Alarm
  32. Motorcycle alarm
  33. Enhanced 5 Digit Alarm Keypad
  34. Enhanced 4 Digit Alarm Keypad
  35. RF Alarm
  36. Single Zone Alarm
  37. Water Activated Alarm
  38. Water level alarm
  39. Perimeter monitor
  40. Digital combination lock
  41. Alarm control keypad
  42. Almost Ultrasonic Motion Sensor
  43. Touch activated alarm system
  44. Combination Lock (PIC16F84)
  45. Low power RFID transponder


  46. Go to Top
    Amplifiers of audio potency and RF
  47. amplificador de 100w rms com o tda7294
  48. 70...100w_dmos_audio_amplifier_with_mute&st-by
  49. 70w-pwr-amp
  50. ampli-lm1875-18w
  51. TDA7294
  52. Amplificador de 60 Watts com tip3055 e 2955 
  53. Two transistor audio amplifier
  54. amplificador de 22000 w rms
  55. amplificador stereo de 100w com stk4231
  56. amplificador a mosfet de 100w
  57. Personal stereo audio amp
  58. Headphone amplifier
  59. Amplificador com o tda8571
  60. 1.5W Audio amplifier
  61. Low-level audio amp
  62. 10W amplifier
  63. 80W amplifier
  64. amplificador de Audio com o tda2030
  65. LM383 12V Amplifier
  66. Amplificador de 100w rms com  tip 142 e 147
  67. 100W Amplifier
  68. 18W Audio amplifier
  69. 25W MOSFET amplifier
  70. Headphone amplifier
  71. Portable headphone amplifier
  72. amplificador de three way de 300w
  73. amplificador de 70w rms
  74. amplificador de 310w rms
  75. 2W amplifier
  76. 4W amplifier
  77. 8 watt audio amp
  78. amplificador de 100 e 200w em brigid
  79. 20W Amplifier
  80. 50W Amplifier
  81. amplificador de 120W mosfet irf9540 540
  82. 100W Audio amplifier
  83. 100W RMS Amplifier
  84. 2-Channel Power Amplifier
  85. Push-Pull Class A Amp using type 5687 dual triodes
  86. amplificador com o tda7386
  87. Push-Pull Class A 2A3 Stereo Amp
  88. Single Ended Class A2 SV811-10 Stereo Amp
  89. Audio amplifier output relay delay
  90. Spatial Distortion Reduction Headphone Amp
  91. amplificador de 380w rms
  92. HeadBanger Headphone Amp
  93. 2W Amplifier
  94. TDA2030 8 Watt amplifier
  95. Amplificador Linear de RF
  96. Headphone distribution amp
  97. Headphone monitor amp
  98. 50W audio power amplifier
  99. amplificador de 10w com o tda2003
  100. Bi-Directional 2.4 GHz One Watt Amplifier
  101. Bi-Directional 900Mhz One Watt Amplifier
  102. 20 Watt GaAaFET Power on 2.3 GHz
  103. 1 Watt 2.3 GHz RF Amplifier Using a MRF2001
  104. Subwoofer ativo
  105. 2.3 GHz Power Amplifiers
  106. 2304 and 3456 MHz Power Amplifiers
  107. High quality exponential VCA
  108. 16 Watt amplifier
  109. 8 Watt amplifier
  110. Power amp schematic (PDF)
  111. amplificador de 100w rms
  112. 20 Watt Class-A Power Amplifier
  113. El-Cheapo - A Really Simple Power Amplifier
  114. Single Chip 50 Watt / 8 Ohm Power Amplifier
  115. Hi-Fi Headphone Amplifier
  116. amplificador stereo de 25w com stk4141
  117. 100W Guitar Amplifier
  118. Death of Zen (DoZ) - A New Class-A Power Amp
  119. Soft-Start Circuit For Power Amps
  120. Thermo-Fan To Keep Your Amp Cool
  121. amplificador de áudio stéreo de 600w rms
  122. Audio Amp Output Power Limiter
  123. 55W (Originally 75W) Power Amplifier
  124. 300W Subwoofer Power Amplifier
  125. 20 Watt / Channel Stereo Power Amplifier
  126. Mini bench amplifier (LM386)
  127. 12 Watt Valve Guitar Amp
  128. amplificador de 300w
  129. amplificador de 400w
  130. amplificador de 110w rms com o 2n3055

    131. Go to Top
    Audio pre-amplifiers
  131. pré-amplificador com lm741 ou ca3140
  132. sistema de loudnes com pré-amplificador
  133. Microphone amplifier
  134. mesa de som stereo de 3 canais
  135. RIAA phono amplifier
  136. pré-amplificador de microfone
  137. Low impedance microphone amplifier
  138. Dynamic microphone preamplifier
  139. buffer para cd player
  140. Phono preamp
  141. Masthead preamp
  142. tonal ativos com controles dos graves
  143. Preamplifier for microphone or guitar use
  144. Simple microphone preamplifier
  145. crossover ativo
  146. Tube microphone preamp
  147. Simple Stereo Electret Microphone Preamplifier
  148. Simple Stereo Electret Microphone Preamplifier
  149. chave digital de áudio
  150. Phono Preamp
  151. Simple microphone preamplifier
  152. ECM Mic preamp
  153. pré-amplificador com agudos
  154. Hi Fi preamp
  155. Balanced microphone preamp
  156. Audio preamp
  157. pré-amplificador para microfone de eletreto
  158. Electret mic amplifier
  159. Audio preamplifier
  160. pré-amplificador de alta qualidade
  161. Vacuum Tube Microphone Preamp
  162. FET Preamp Cable
  163. Audio preamp
  164. pré-amplificador para mic de eletreto
  165. pré-amplificador de audio
  166. pré-amplificador para captador
  167. pré-amplificador com realimentação híbrida
  168. sistema de loudnes com pré-amplificador
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    Automotive, circuits for car and moto
  169. Electronic auto stethoscope
  170. Turn signal alarm
  171. Motorcycle turn-signal system
  172. Cigarette lighter 9V adaptor
  173. Analog Tachometer for Gasoline Engines
  174. Headlight On reminder with Light
  175. Adaptive Windscreen Wiper Control
  176. Car clock
  177. Car message display
  178. Car interval wiper
  179. Safety indicator light
  180. Speed limit alert
  181. Grand Cherokee Off-Highway Lights
  182. Engine control unit schematics
  183. Portable CD Player Adapter For Car
  184. Car battery charger
  185. Wireless Auto Tachometer
  186. Alternator Signal Detector
  187. Automotive alarm system
  188. Road ice alarm
  189. Automotive Anti-Lock Brake Control Driver
  190. Headlight reminder
  191. Breath Alcohol Tester controlling a car ignition system
  192. Simple car battery charger
  193. Parking sonar
  194. Fuel injector pulse width monitor
  195. BMW R Series Motorcycle Regulator Schematic
  196. 80188XL Engine Tachometer
  197. Integrate Fuel Pump Wire Security Cut Off with a Turbo Timer
  198. Simple Car Preamplifier and Artificial Earth
  199. FCD (Fuel Cut Defencer)
  200. Interface between GM's 5 Volt 8192 baud ALDL data stream and a PC serial port
  201. 5301 wideband fuel mixture display
  202. Wide Band Fuel Mixture Display
  203. 3rd brake light
  204. 12V to 9V car coverter
  205. Car Nicad charger
  206. Combination lock for car liftgate
  207. BMW motorcycle side stand protection mod

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    Data aquisicion and logical circuits
  208. Air flow detector
  209. Air flow detector
  210. Strain gauge sensor
  211. Digital Water Wave/Tide/Level Meter (PIC16F876)
  212. Self made data-logger V2.5 (second edition)
  213. Magnetometer
  214. Analog input section based on AD9220
  215. uModem 4+4/8 channel A/D board
  216. ADXL202 accelerometer to CV output
  217. Light direction sensor
  218. 12-Bit ADC interface
  219. Digital thermometer
  220. Universal flight controllers / datalogger
  221. Rain detector
  222. Home Brew Compass Sensor
  223. Using 555 Timer as an A/D converter
  224. ADC0804LCN 8-bit A/D converter
  225. Web-based thermometer project
  226. Low Flow-Rate Thermal Flowmeter
  227. Geiger counter
  228. Differential Capacitance Measurement for Tilt Meter
  229. Honey Bee counter (PDF)
  230. Capacitance type liquid level measurement (PDF)
  231. Thermostat node schematic
  232. Digital PC Oscilloscope
  233. Ultrasonic Range & Imager
  234. Precision Digital Altimeter
  235. Digital compass schematic
  236. Temperature datalogger
  237. Serial Port A/D-converter
  238. Centronics port D/A converters and low-pass filter
  239. LCD Thermometer
  240. Acceleration monitor using Analog Devices ADXL202
  241. Optical sensor using PIC12C508
  242. Wireless Liquid Level Sensing for Restaurant Applications
  243. Accelerometer Schematic
  244. Pressure Sensor-Based Altimeter Circuit
  245. Ultrasonic range finder circuit
  246. 1-wire barometer
  247. Water-level sensor
  248. Addressable ADC
  249. Electronic altimeter using PIC16F877
  250. Wireless weater station

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    Filters rf and audio
  251. Galaxy Noise Filter
  252. Low-pass active filter
  253. Filter Circuit for the Earthworm Seismic Data Acquisition System
  254. Active 2nd Order Filters
  255. RC Notch Filter (Twin T)
  256. Multiple Feedback Bandpass Filter
  257. CW filters
  258. Self-tune filter
  259. SSB AF filter
  260. Helical Resonator Notch Filter
  261. 3KHz low-pass filter plus audio amp (PDF)
  262. Active bandpass filters
  263. Bandpass filters
  264. Butterworth filters
  265. Narrow band audio bandpass filter
  266. Inversal notch and bandpass filter
  267. DC Accurate, Active RC Lowpass Filter
  268. Chebyshev Bandpass Filter
  269. Bandpass filters
  270. Chebyshev / Butterworth filters
  271. Biquad Active Bandpass Filter Schematic
  272. "A" Weighting Filter For Audio Measurements
  273. Multiple Feedback Bandpass Filter
  274. Digital signal processor (DSP) for radio communications
  275. 29.85 MHZ bandpass filter schematic
  276. 29.85 MHZ notch filter schematic
  277. LC filter design

    278. Go to Top
    Games and fun  (circuits)
  278. Visor cradle serial interface
  279. Electronic coin tosser
  280. Electronic craps game
  281. First response monitor
  282. VCR ping pong game
  283. Video ping pong game
  284. MBC5/CPLD for the GameBoy
  285. GameBoy Camera Parallel Port Interface
  286. Mobile robot (PDF)
  287. PSX controler to PC MIDI converter
  288. Dreamcast PC serial adapter
  289. GameBoy Cart Programmer
  290. Memory game
  291. 32 Kb x 8 emulator for the GameBoy
  292. Project: NES to Atari 2600 controller interface
  293. Battery Meter for Pinball Machines
  294. SRX1 (Stephane's Robotic eXperiment 1)
  295. Pine Racecar Victory Judge
  296. Interfacing Sony control stick to Empeg
  297. Electronic Nicad glow plug driver
  298. April Fools LEDs
  299. Pinewood Derby logic
  300. Quiz Master
  301. GameBoy Schematic
  302. GameBoy LCD schematic
  303. GameBoy Power & Cartridge schematic
  304. GameBoy ROM+RAM+MBC1 Cart Schematic
  305. GameBoy MBC1 circuit equivalent
  306. Super GameBoy schematic
  307. Quiz show indicator
  308. Dreamcast interface
  309. Bingo!!! (on your tv)
  310. Slot car TV cronograph
  311. Furby reverse-engineered circuit
  312. Sanyo 20EZ monitor Arcade Game (300k ZIP)
  313. Burger Time Arcade Game (500k ZIP)
  314. Dig Dug Arcade Game (800k ZIP)
  315. Frogger Arcade Game (500k ZIP)
  316. Galaga Arcade Game (542k ZIP)
  317. Gyrus Arcade Game (800k ZIP)
  318. Junior Pacman Arcade Game (400k)
  319. Ladybug Arcade Game (335k ZIP)
  320. Mappy Arcade Game (470k ZIP)
  321. Moon Cresta Arcade Game (300k ZIP)
  322. Mr.Do Arcade Game (554k ZIP)
  323. PacLand Arcade Game (316k ZIP)
  324. Pengo Arcade Game (313k ZIP)
  325. Q*Bert Arcade Game (600k ZIP)
  326. Qix Arcade Game (476k ZIP)
  327. Scramble Arcade Game (600k ZIP)
  328. Time Pilot'84 Arcade Game (870k ZIP)
  329. Xevious Arcade Game (450k ZIP)
  330. Magic Wand Conjuring Trick
  331. Quiz game circuit
  332. E.S.P. Conjuring Trick
  333. Video game system using PIC18F252 (direct video generation)
  334. Video game system using SX28 (direct video generation)
  335. DIT shutterglasses controller
  336. Tic-tac-toe game using PIC16F628
  337. Archery timer
  338. PIC micro Tetris game
  339. Magic lamp, IR remote control jammer and other fun circuits (PDF)
  340. Lego Mindstorms Double Rotation Sensor


    341. Go to Top
    Infra-red circuits remote control and outers
  341. IR detector
  342. Infrared body heat detector
  343. Stereo IR audio receiver
  344. General purpose IR receiver
  345. Wireless IR headphone transmitter
  346. Wireless IR headphone receiver
  347. Infrared remote control shutter release system
  348. Infrared transmitter for locomotives
  349. Infrared gate for door
  350. Infrared circuits for remote control
  351. Serial port controller infrared transmitter (PIC16F628)
  352. IR Receiver (Amplitude Modulated IR)
  353. IR Transmitter for Audio (Amplitude Modulated IR)
  354. Digibox interface
  355. IR remote control
  356. Long Range Infrared Remote
  357. iRDA to TTL interface
  358. 40KHz light receiver (PDF)
  359. 40KHz TV-VCR repeater (PDF)
  360. Micro based PIR to IR remote converter
  361. IR-related ASCII Schematics V1.00
  362. Infrared remote transponder
  363. Build an Infrared night scope
  364. Decoding IR Remote Controls
  365. IR detector
  366. PC IR Remote Control Hardware
  367. PC IR Remote Control
  368. An Ambient-Light-Ignoring Infrared Active Motion Detector
  369. Infrared Transmitter and Receiver schematic diagrams
  370. Pyroelectric Infrared Sensor
  371. Minimal Infrared transmitter for PC
  372. Simple IR transmitter circuit
  373. Simple infra-red detector
  374. AVR (AT90S2313) serial port infrared receiver
  375. Infra Red Switch
  376. IR remote control extender
  377. IR Remote Control Extender Circuit (Mark 2)
  378. IR Remote Control Extender Circuit (Mark 3)
  379. IR Link
  380. IR remote control tester
  381. 40khz IR Tester
  382. 555 timer 40khz IR Oscillator
  383. IR detector / emitter
  384. Fire-Stick infrared remote control
  385. Simple infrared remote control
  386. Infrared / Ultrasonic beacon
  387. Implementing Infrared Object Detection
  388. IR detector for robotics
  389. Computerized Infrared Remote

    390. Go to Top
    Laser trnsmitters and power supply for laser equippaments
  390. Light beam receiver for laser pistols
  391. 12V supply for He-Ne laser
  392. Laser diode transmitter
  393. Laser power supply
  394. Laser transmitter/receiver
  395. Laser harp
  396. Laser Telephone Receiver Circuit
  397. Fiber Optic Voice Communications
  398. Efficient Laser Supply
  399. 20MHz VCSEL 3mW laser test circuit (PDF)
  400. 10MHz to 20MHz laser light detector (PDF)
  401. Micro-power 40KHz burst laser diode driver (PDF)
  402. 40KHz laser burst detector (PDF)
  403. Modulated laser diode tester (PDF)
  404. Ar/Kr Ion Laser Power Supply
  405. Laser diode power supply circuits
  406. RS-232 Laser Transceiver
  407. HeNe laser power supply
  408. OPT201 Laser receiver
  409. OPT301 Laser receiver
  410. Laser transmitter schematics
  411. Diode Laser Power Supplies
  412. Laser bug circuit
  413. RS-232 Laser Transceiver
  414. Experimental laser data link
  415. Ar/Kr Ion Laser Power Supply Design
  416. Simple laser communicator

    417. Go to Top
    LED ilumination light circuit
  417. Big 7-segment LED display board with SPI interface
  418. LED Flasher
  419. LED pulser with audible output
  420. IR Illuminator
  421. Flashing Christmas LED display
  422. ICL7660 LED flasher
  423. LM3909 replacement using discrete components
  424. Color fade
  425. LEDs shimmer randomly as though on fire
  426. LED power supplies for AA cells
  427. 1.5 Volt LED Flashers
  428. AC Line Powered LEDs
  429. Astable Multivibrator
  430. 9 Second Digital Readout Timer
  431. 9 Second LED Relay Timer
  432. 16 Stage Bi-Directional LED Sequencer, other sequencer and flaser circuits
  433. 10 Stage LED Sequencer
  434. 28 LED Clock Timer
  435. Fading Red Eyes
  436. Two Transistor LED Flasher
  437. 16 Stage Bi-Directional LED Sequencer
  438. Expandable 16 Stage LED Sequencer
  439. LED Photo Sensor Circuit
  440. LED chaser
  441. 7 Segment LED Counter
  442. 7 by 10 LED Moving Sign ( 27C512 EPROM)
  443. Sequencial LED Flasher with Reversable Direction
  444. Tri Color LED Controller with Serial Interface
  445. 1.5V LED flasher B (PDF)
  446. Low current LED flasher (PDF)
  447. 1.5V LED flasher A (PDF)
  448. Flashing LED advertising badge (PDF)
  449. Flashing LED advertising badge (PDF)
  450. Pulsed LED test circuit (PDF)
  451. Low battery voltage flasher (PDF)
  452. Adjustable flashing LED
  453. PWM white LED drivers
  454. Heart of LEDs
  455. Christmas Star
  456. Christmas tree
  457. LED Counter
  458. PIC16F84 LED chaser
  459. PIC16F84 LED signboard
  460. PIC16F84 LED signboard 2
  461. White LED circuits
  462. Assorted LED circuits
  463. LED Mood Light
  464. LED Audio VU Meter
  465. Robot Beacon rotating light using PIC12C508
  466. LM3909 LED flasher
  467. Animated LED signboard (PIC16C84)
  468. Picxie 2 - 8x8 Animated LED Signboard

    Go to Top
    Ilumination an light related cicuit
  469. Dimmer AC
  470. Garden light switch
  471. DMX lighting and special effects
  472. Microcontroller Multichannel Light Dimmer
  473. Digital timer light switch
  474. Hand clap lamp control
  475. Radio controlled light switch
  476. Disco style Strobe Light
  477. Varying Brightness AC Lamp
  478. 12 Volt Lamp Dimmer
  479. 120VAC Lamp Chaser Using Solid State Relays
  480. Flashing Neons (NE-51 / NE-2)
  481. Sequencing Neons (NE-51 / NE-2)
  482. Touch Activated Lamp
  483. 220V Flashing lights
  484. Coutesy lamp
  485. Bedside lamp timer
  486. TRIAC light dimmer
  487. 12VDC Fluorescent Lamp Driver
  488. Strobe light
  489. Adjustable Strobe Light
  490. RHINO8 EL Sequencer
  491. Light Sequenced Candelabra
  492. Light timer
  493. 5W Fluorescent light intensity modulator (PDF)
  494. 1W Fluorescent lamp night light (PDF)
  495. Low-voltage light dimmer
  496. Light chaser
  497. 4-channel dimmer rack
  498. PIC16F873 light controller
  499. Disco light controller
  500. Neon desklamp
  501. Electronic night light
  502. Neon lamp dimmer
  503. LED Mood Light
  504. LX-800 Lighting system
  505. Xenon Strobe Light
  506. Lamp flasher/dimmer

    507. Go to Top
    Health and hospital circuits related
  507. Snore alarm electronic device
  508. Heartbeat transducer
  509. ECG Amplifier
  510. EKG/EEG circuit
  511. Radiation Dosage-Rate Meter
  512. Heartbeat monitor
  513. Cranial Electrotherapy Stimulator
  514. Automated crib lights
  515. Jogging timer
  516. Tan timer
  517. Muscular Bio-stimulator
  518. Pedometer
  519. Simple lie detector
  520. EEG preamp, anti alias filter and isolation circuit
  521. Self Contained Electromyograph (EMG)
  522. Cardiac monitor
  523. Galvanic Skin Response (GSR) Schematic
  524. Brain-Wave Machine
  525. Lie detector
  526. Simple lie detector
  527. ECG project page
  528. The ESP SIM (Sound Impairment Monitor)
  529. Respiration system

    Go to Top
    Microcontrollers circuits, programmers ands board development for pic, 8051, avr, motorola, basic step, and outers
  530. CURSO BÁSICO DE PIC
  531. Microcontroladores PIC E-book gratuito do Pic16f84
  532. 3dip8 programador e Microchip forum
  533. ART2003 Pic programador
  534. Ecopic Programador
  535. GTP-04 e GTP-07  programador
  536. GTP-Lite Programador
  537. GTP-USB-#0 e #1
  538. GTP-USB-#F1
  539. GTP-USB-232
  540. JDM programmer
  541. Pablin
  542. Paraprog
  543. PG3B
  544. Pic800
  545. Picburner
  546. PP2
  547. Propic2
  548. Gravador de PIC PROGPIC II Revista mecatrônica fácil
  549. RCD Programmer
  550. Gravador JDM com fonte externa (recomendável)
  551. PROGRAMADOR DE MICROCONTROLADORES PIC POR PUERTO USB
  552. PIC based packet radio encoder (PDF)
  553. Atmelprog
  554. Avr2313mod1
  555. Avr8515_eval-board_node13_gpl2
  556. Avr_zigbee_802.15.4_reva01
  557. avrmp3
  558. Evaluationboard_at89xx
  559. ICD2-2
  560. ICD2
  561. PIC18f452
  562. Wineprom
  563. RS485-Version of the SAB80C535-Microcontrollerboard
  564. PC IR receiver based on PIC16F84
  565. Record and play fast 1-bit sound on a PIC micro
  566. AT89C2051/4051scanning 7-segment display and keypad
  567. AT89C2051/4051 Driving dot LED
  568. AT89C2051/4051stepper motor interface
  569. AT89C2051/4051connecting dumb terminal
  570. Motorola 68K SBC (single board computer)
  571. 8051 SBC (single board computer)
  572. Simple RS232C Level Converter using Transistors
  573. Motorola 68HC11 evaluation board
  574. C-52 EVB Robot Controller
  575. Mains clock controller using AT89C2051
  576. AT89C2051/4051 Easy-Downloader
  577. AT89C51/52/55 Easy-Downloader
  578. PIC16F84 programmer
  579. PIC16F84 miniature real-time controller
  580. Isolated RS232 for PIC16F84
  581. PIC16F84 debugging terminal
  582. MiniLOGGER V1.0
  583. Analog datalogger based on T89C51RD2
  584. Atmel 89C Series Flash Microcontroller Programmer
  585. Atmel 89C2051 prototype board
  586. AT89C2051 real-time controller
  587. PIC12C508 Night-light saver
  588. AT89C2051 Night light saver
  589. Atmel 8051 Flash Based-Microcontroller Programmer
  590. AT89C2051 Digital thermometer and clock
  591. 4-Channel Timer using Atmel 89C4051 and MAX7219 display driver
  592. PIC16F84 CW decoder (PDF)
  593. 12C508 Smart Lock
  594. 80C31 stepper motor controller
  595. Build a PIC controlled DDS VFO, 0 to 6 MHz
  596. PIC controlled DDS VFO, 0 to 6 MHz
  597. Basic Stamp Lightning Activity Monitor
  598. Parallel AVR programmer
  599. PIC16F84 line following robot
  600. PIC16C505 IR / wireless remote control
  601. Automatic door opener with PIC12C508
  602. RS485-like multi-drop bus with half duplex serial protocol
  603. WWWpic2 - A web server in a PIC
  604. PIC16F84 web server
  605. 50 MHz frequency counter, voltage meter & SWR/PWR indicator
  606. Microcontroller board using the Atmel AVR AT90S8535
  607. Programmer PIC16F84,12C50x and EEPROM 24Cxx
  608. RDS Encoder - digital part
  609. PIC programmer for serial port
  610. Fully functional PS/2 mouse based on the PIC16F84
  611. PIC 18 programmer (PIC18F458, PIC18F452, PIC18C252, PIC16C745, PIC18F6620, PIC18F6720)
  612. Foreign vocabulary recollector
  613. Illuminate holiday destinations on a world map
  614. Embedded system to send e-mails (small TCP/IP stack)
  615. Speaking clock using PIC & ISD device
  616. Speaking doorbell using PIC & ISD device
  617. Whistle detector using 8-pin PIC
  618. PIXpand
  619. PIC16F877 to IDE interface
  620. 68HC11 stepper motor control
  621. 90S2313 AVR Robot Board
  622. POCSAG encoder/decoder
  623. Network Time Protocol AVR Clock
  624. DS1820 Temperature Sensor Readout Unit
  625. Rotating Sprocket Wheel Generator (PIC16F84)
  626. Talking PIC - based on SP0256
  627. Serial to parallel converter using the AT89C2051
  628. AT89C2051 serial COMs to LED driver
  629. PIC16F877 Programmer And Development System
  630. DS1820 Arbiter V2.00 Schematic
  631. Microchip PIC ICSP implementation
  632. 101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU
  633. LCD Serial Terminal
  634. Propellor clock (PIC16F84)
  635. Optical sensor using PIC12C508
  636. Interfacing S-7800A to PIC16F877
  637. A Scenix (and PIC) Programmer
  638. MMC to PIC16F876 circuit diagram
  639. 8088 maximum mode SBC
  640. EZ80 single board computer schematic (Z80)
  641. 8051 Development System Circuit Board
  642. Voice recording and message retrieval system
  643. Interfacing a GPS to an LCD using a Microcontroller
  644. Long-period watchdog timer
  645. PIC16F84 Range Finder Project
  646. Generate video signals in real-time using a PIC16F84
  647. PIC ICD
  648. PIC Project #1 - RS232 to I2C Interface
  649. Galvanic decoupling of I2C bus
  650. Programmer PIC16F84,12C50x and EEPROM 24Cxx
  651. Dual PIC16C84 prototype board
  652. Graphic LCD interface
  653. FSK modem with PIC16C84
  654. Talking YODA project (PIC16C84)
  655. PIC16F84/PIC16F87x-In-System-Programmer
  656. Microcontroller interface for 5KW microwave oven
  657. Using an I2C Serial EEPROM with a Basic Stamp 2
  658. PIC16F84 Based Morse Code Reader
  659. AVR-Based Serial Port IR Receiver
  660. Interfacing piezo elements to a microcontroller
  661. Victoria TAFE programmer (based on AT89C2051)
  662. JDM programmer
  663. PIC micro programmer
  664. Speech recognition using HM2007
  665. PIC microcontroller servo motor interface
  666. PIC micro multiple servo motor interface
  667. PIC16F84 countdown timer
  668. PIC16F873 ultrasonic range meter
  669. PIC16F873 Digital clock
  670. PIC16F873 remote display
  671. PIC16F84 stepper motor controller
  672. Way small web server
  673. PICADC - a free, PIC based "intelligent" A/D converter
  674. 8051 development system circuit board
  675. 8088 maximum mode single board computer (SBC)
  676. Basic 89C2051 / 89C4051 circuit diagram
  677. Debugging dump terminal for 89C2051 designs
  678. Easy debugging terminal
  679. Galvanic decoupling of I2C bus
  680. Circuits interfacing piezo elements to a microcontroller
  681. Driving a TRIAC using a PIC12C508
  682. Isolated RS232C for PIC16F84
  683. Microchip ICD (in-circuit debugger) circuit diagram
  684. Microchip PIC ICSP implementation circuit diagram
  685. Interfacing NMEA GPS to LCD using PIC16F84
  686. PIC ICD (in-circuit debugger)
  687. PIC16C71 morse code callsign generator
  688. PIC16F84 to LCD interface
  689. PIC16F84 I/O expander with PicBasic
  690. Scanning 7-Segment & Keypad
  691. 10-key serial keypad encoder
  692. Simple RS232C Level Converter using Transistors
  693. Talking PIC microcontroller using SP0256
  694. PIC-Programmer 2
  695. Connecting PIC12C508 8 to 93AA46 serial eprom
  696. KD7LMO Micro Beacon (PIC18F252)
  697. GPS LCD Display Project
  698. PIC16F84 LED chaser
  699. PIC micro LED projects
  700. PS/2 keyboard keystroke logger based on Atmel 89C2051
  701. Electronic distance meter based on Motorola 68HC908QY4
  702. Fan timer based on Motorola 68HC908QT2
  703. Atmel AVR and 8051 series ISP programmer
  704. AT89C2051 line-follower robot
  705. Night light saver (PIC12C508)
  706. USB and GLCD expansion board for 8051 SBC
  707. Basic stamp interface circuits
  708. Microcontroller sensor and actuator interfaces
  709. Giant money counter (PIC16F876)
  710. PIC12C509 logic gate replacement for nitrogen filler
  711. PIC demo board
  712. PIC12C509 Gym Timer
  713. PIC LCD and Keypad driver
  714. PIC12C508 Phase Controller for 2kW heater
  715. PIC16F84 TRIAC / IGBT brightness phase controller
  716. PIC16F84 pulse monitor with date/time output (ZIP)
  717. Programmer for the 68HC705C8 MicroController
  718. 27c801 EPROM Programmer Project
  719. LCD to PIC16C54 schematic
  720. 68HC11 based RDS decoder
  721. Acceleration monitor using ADXL202 and AVR
  722. 40+ MHz 5-digit frequency counter with an AVR 2313
  723. Interfacing DRAM to AT90S8515
  724. Temperature monitor/controller: AVR 2313 / DS1621
  725. PIC micro to ISA bus interface
  726. PIC16C84 VT-52 Emulator for Linux
  727. Microchip PIC ICD (in-circuit debugger)
  728. Tony Nixons Pocket Programmer (PIC)
  729. PicoWeb V5.1 (AT90S8515) tiny web server
  730. Atmel 89C2051 In-Circuit Programmer Schematic
  731. 8051 Development System Circuit Board
  732. 8051 Development System Circuit Board
  733. Microprocessor using Xilinx FPGA
  734. Temperature controlled based on AT89CX051
  735. I2C LCD interface
  736. AFSK 1200 Modem based on PIC16C620
  737. PicCon - Hidden Radio Transmitter Controller
  738. PIC16F84 tone generator with source code
  739. PIC16F84 tone generator
  740. PIC16F84 tone generator (6-Bit)
  741. AVR Beacon Super Keyer
  742. AVR Frequency Counter
  743. AVR Digital Voltmeter
  744. AVR Signal Generator
  745. Ser-Key 10-Key Serial Keypad Encoder
  746. 2-wire LCD interface using PIC16CF84
  747. PIC16F84 Serial I/O-expander with PicBasic
  748. RS 485-RPT Schematic
  749. Camera remote control system using Basic Stamp
  750. Low cost Atmel in-system programmer
  751. Ultra low-cost programmer for AT90S family
  752. AVR to USB interface
  753. Programable LCD counter with memory backup based on Atmel AT90S1200A
  754. Connecting AT90S2313 with LCD display 2x16 char and 4x4 keypad
  755. Atmel AVR RCEN fuse bit programmer
  756. Electronic safety lock based on ATtiny26
  757. GSM SMS remote control using AVR microcontroller
  758. 128x64 LCD Driver for AT90S2313 (ZIP file)
  759. Connecting LED to PIC Micro I/O pins (PDF)
  760. Microprocessor RS-232 Reset
  761. AT90S8515 experimenter board
  762. Multi-chip programmer for PIC microcontrollers
  763. Buffered PIC chip interface
  764. A PIC-Based Keyboard Emulator
  765. PIC-based robot
  766. ScanMate audio activated recorded
  767. PIC vacuum fluorescent display interface
  768. PIC18F252 bootloader schematics
  769. PIC16F876 Datalogger
  770. GPS Repeater
  771. Kodak DC-20 camera interface (PIC12C509)
  772. Kodak DC-20 camera interface (PIC16F84)
  773. PIC ICD in-circuit debugger circuit diagram
  774. PIC programmers for parallel port
  775. Wisp628 ISP Microchip PIC Programmer
  776. WLoader - PIC16F877 application loader / bootloader
  777. Nixie clock (PIC16F876)
  778. Zilog Z80 thermostat embedded web server
  779. Picxie 2 - 8x8 Animated LED Signboard (PIC16F84) Picxie 2 - 8x8 Animated LED Signboard
  780. 10 tricks for interfacing to the PIC16C508
  781. Interfacing the PIC16C508
  782. PIC 5x7 display
  783. Analog to digital conversion notes
  784. Multi-chip programmer

    Go to Top
    Several audio circuits
  785. Electronic siren
  786. Two-tone siren
  787. Underwater microphone
  788. Code practice oscillator
  789. Noise generator
  790. Electronic whistle
  791. Twin-T Audio Sine Wave Oscillator
  792. 1.5V Audio Amplifier
  793. Low Power Op-Amp - Audio Amp (Intercom)
  794. 555 Tone Generator (8 Ohm Speaker)
  795. 3 Transistor Audio Amp (50 milliwatt)
  796. Low Frequency Sinewave Generator
  797. Automatic Charger for Battery Operated Hi-Fi Preamps
  798. Audio level indicator
  799. Room noise detector
  800. Amplifier timer
  801. Bell ring generator
  802. Amplified ear
  803. Precision audio millivoltmeter
  804. Six-channel Mixer and Amplifier
  805. Audio Signal Source
  806. Analog VU meter
  807. Voltage controlled amplifier
  808. Audio graphic equaliser
  809. Intercom preamp
  810. FET audio mixer
  811. Microphone mixer
  812. Tone control
  813. Digital volume control
  814. Sound level meter
  815. CMOS IC audio oscillator
  816. Three band Active Tone Control
  817. Automatic gain control (AGC) circuits
  818. Audio frequency meter
  819. Bull Horn
  820. Sound Mixer/Amplifier
  821. Very loud beeper (PDF)
  822. Digital noise generator (PDF)
  823. Tone display system
  824. Tube amplifier
  825. Condenser microphone hookup
  826. Phase shifter
  827. Paradoxical Sound Syntheizer
  828. Various tube crossover circuits
  829. Bias circuits
  830. Audio line isolator
  831. Dynamic microphone to electret microphone input
  832. Line level signal to microphone input adapter
  833. Simple two line output combiner
  834. Electret microphone powering circuits
  835. Use amplifier phono input as line level input
  836. Speaker signals to line level inputs
  837. Spring reverb unit
  838. Sine wave generator
  839. Simple amplifier
  840. 3-Band equalizer
  841. 6-Input mixer
  842. Doorphone intercom
  843. Stereo line driver
  844. Audio notch filer
  845. Peak reading audio level meter
  846. Tone control
  847. Speaker Microphone Circuit
  848. Electronic canary
  849. Electronic siren
  850. Microphone phantom power supply
  851. Voltage Controlled Mixer w/Modulator
  852. Dual Voltage Controlled Oscillator w/Modulator
  853. Dual Voltage Controlled Filter w/Modulator
  854. Stereo Ducker
  855. MS Stereo Decoder
  856. MS Stereo Microphone
  857. RIAA Equalized Stereo Phono Preamp
  858. Tube active crossover
  859. Improved PL tone decoder
  860. Magnetic cartridge amplifier
  861. LM358 preamp
  862. Sound detector
  863. Tone detector
  864. Tone generator
  865. Warbler
  866. Voltage Controlled Panner
  867. Low Noise Microphone Preamplifier
  868. Bridging Adapter For Power Amplifiers
  869. Simple Surround Sound Decoder
  870. Simplest Ever Amplifier Bridging
  871. Stereo Width Controllers
  872. Power Amplifier Clipping Indicator
  873. Phono Preamps For All
  874. Digital Delay Unit For Surround Sound
  875. Parametric And Sub-Woofer Equaliser
  876. High Quality Sound Mixer
  877. Loudspeaker Protection and Muting
  878. Direct Injection Box for Recording & PA Systems
  879. Minimalist Discrete Hi-Fi Preamp
  880. Signal Detecting Auto Power-On Unit
  881. Load Sensing Automatic Switch
  882. Amplifier thermal protection
  883. Active Sub-Woofer and Controller
  884. Balanced Line Driver & Receiver
  885. VU And PPM Audio Metering
  886. Variable Amplifier Impedance
  887. Linkwitz Cosine Burst Generator
  888. Low Noise Balanced Microphone Preamp
  889. Fast Audio Peak Limiter
  890. Subwoofer Equaliser
  891. Surround Sound Decoder Mk2
  892. Audio mixer

    893. Go to Top
    miscellany (various circuits)
  893. Ultrasonic radar
  894. Mobile APRS / GPS tracking system
  895. Electronic fish lure
  896. Ultrasonic sound receiver
  897. Experimental data transmitter for fiber optics
  898. Experimental fiber optic receiver
  899. Ion detector
  900. Darkness monitor
  901. Electroscope
  902. Simple event counter
  903. Geiger counter
  904. Light detector
  905. Short-circuit beeper
  906. LM 1800 FM stereo decoder
  907. Glitch detector
  908. MAX924 bar-graph level gauge
  909. Ultrasonic generator
  910. Negative ion generator
  911. ELF Monitor
  912. Chaos generator
  913. Simple BFO metal detector
  914. Voltage Comparator Information And Circuits
  915. Build Your Own Digital Setting Circles For Your Astronomical Telescope
  916. PL tone generator (NE567)
  917. Bat detector
  918. Bat detector microphone pre-amplifiers
  919. Full-duplex doorphone with 3 wires connection
  920. G Strain energy absorber
  921. RDS Encoder
  922. Toggle Switch Debounced Pushbutton
  923. Discrete Set/Reset Flip Flop
  924. Monostable Flip Flops (one shot)
  925. Discrete Bistable Flip Flop
  926. Talking Morse Code Practice Computer
  927. Plant watering watcher
  928. Capacitance sensor
  929. Whistle responder
  930. Nocturnal animals whisker
  931. 12V DC electronic door chime
  932. Biasing Op-Amps into Class A
  933. Parasite zapper
  934. Bleeper box for time reference
  935. Analog computer
  936. BayComm packet modem
  937. Morse monitor
  938. HamComm modem interface
  939. Morse paddle keyer
  940. UV light box
  941. Hardware Random Bit Generator
  942. Random noise generator
  943. Analog pulse counter
  944. Analog opto-isolator
  945. Pulse width modulators (PWM)
  946. Pulse width to voltage converter
  947. Fantastic Atom Expander
  948. Black Light
  949. Computerize Your Room/Home
  950. Flash slave trigger
  951. Suddent ionospheric disturbance (SID) receiver
  952. A Visual CW Zero Beating Aid
  953. A two-way Morse practice set
  954. Magnetic levitation device
  955. Tesla power receiver
  956. Lazer Tag Equipment Modifications
  957. Garmin GPS data interconnect
  958. Inexpensive APRS Weather Station
  959. Walking robot
  960. Basic op-amp circuits
  961. Power line FM intercom
  962. Intercom circuit
  963. Lightning Storm Detector
  964. Large LCD Display Buffering Driver
  965. Text to speech converter
  966. Ion detector
  967. 1uS light pulse descriminator plus F to V converter (PDF)
  968. Broadband 2MHz optical fiber receiver (PDF)
  969. Modulated light received (PDF)
  970. 1uS light pulse receiver plus post amp (MISC)
  971. Broadband 5MHz optical fiber receiver (PDF)
  972. High-speed light receiver (PDF)
  973. Basement doorbell beeper (PDF)
  974. Time to dust indicator (PDF)
  975. Low-power optical interrupter (PDF)
  976. Simple nitrogen spark generator (PDF)
  977. Ultrasonic transducer oscillator circuit
  978. Build logic gates using discrete parts
  979. Jacob's Ladder
  980. Sudden Ionospheric Disturbance (SID) Receiver
  981. A selection of robotics projects
  982. Bat detector (new)
  983. Vat detector (old)
  984. Variety of quick designs
  985. Gold wafer (smartcard) programmer
  986. Making a FRED photopopper
  987. GPS receiver support kit
  988. Griffith Observatory Tesla Coil
  989. Fogger smoke machine
  990. Dinsmore 1490 digital compass
  991. Geiger counter
  992. Electric field disturbance monitor
  993. Inexpensive seismometer project
  994. Digital dial
  995. Speech recognition using HM2007
  996. GPS receiver interface
  997. Doorbell for the Deaf
  998. Electromagnetic field detector
  999. Insect Repellant
  1000. High Quality Intercom
  1001. Magnetic Gun.
  1002. Metal detector
  1003. Static Electricity / Negative Ion Detector
  1004. Ultrasonic dog whistle
  1005. Popular Electronics Ultrasound Detector
  1006. An Inexpensive X-ray Machine
  1007. Navigator 555A radio direction finder (RDF) circuit diagram
  1008. Magnetic levitation circuit
  1009. PE3342 Programmer Schematic
  1010. u-Blox GPS receiver board
  1011. Assorted digital circuits
  1012. Basic electronic circuits
  1013. Miscellaneous simple circuits
  1014. Digital Call Sign Annunciator
  1015. Monitor output from Motorola Oncore GPS engine in HP Z3801A in GPS Disciplined Oscillator
  1016. Ultrasonic switch
  1017. Sound finding cricket with phase detector
  1018. Sound finding cricket
  1019. APRS GPS tracker schematic (PIC16C73)
  1020. Common Ground for Older VPW Circuit
  1021. Very basic circuits
  1022. Bat detector
  1023. FCTS Project
  1024. Smooth Tone Clickless CW Sidetone Generator
  1025. Morse Code Beacon Keyer
  1026. Lightning Activated Camera Shutter Trigger
  1027. Simple metal detector electronic circuit
  1028. Three Power Supplies for the Garmin GPS-20 Sensor Board
  1029. Driving N-channel FETs from TTL
  1030. Miniature Self-Powered Autonomous Robot
  1031. Morse Code Practice Keyer 1
  1032. Morse Code Practice Keyer 2
  1033. 741 Light Sensor
  1034. Fluid level detector
  1035. The Aisin-Seiki GPS-Receiver (The "US$20 GPS")
  1036. Morse code display
  1037. Intercom schematic
  1038. Scaling ADXL50 accelerometer output

    1039. Go to Top
    Modelism and remote control
  1039. Snake throat muscle controller
  1040. Handy cricket for robotic applications
  1041. Incline Railway Control Circuit
  1042. A Receive Signal Decoder
  1043. 27Mhz toy car receiver
  1044. 27Mhz toy car transmitter
  1045. One ounce rocket ejection timer
  1046. LED traffic lights
  1047. Two-tone siren
  1048. Proportional radio remote control
  1049. Alf: The Robotic Matchbox car
  1050. Seaplane schematic
  1051. Model Rocket with Video Camera
  1052. Signal breaking module
  1053. RF serial link for robot
  1054. PIC based rocket altimeter
  1055. Robot with PIC16F84 brain & InfraRed eyes
  1056. 0-10V control for RC servos
  1057. Robotic microcontroller board
  1058. Multi Rocket Launcher
  1059. Model rocket launch controller
  1060. Pad launch controller for model rockets
  1061. Simple flashing light circuit
  1062. Simple flashing light circuit
  1063. A dual alternating flashing light circuit
  1064. Simple flashing light circuit
  1065. A dual tandem flashing light circuit powered by a 9 volt battery
  1066. Simulate the Gyralite (dual flashing headlights).
  1067. Simple train detector using ambient light and a photocell
  1068. Simple charge rate monitor
  1069. Deluxe charge rate monitor
  1070. "CLONEPAC" memory module for Futaba 8UAF/8UAP
  1071. Battery pack discharger
  1072. Plane locator
  1073. Plane locator 2
  1074. Battery low voltage alarm