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Circuits & schematics

  • Audio
  • Automotive
  • Games and entertainment
  • Microcontrollers
  • Miscellaneous
  • Models and model remote control
  • Motor, light and power control
  • Oscillators and timers
  • PC related
  • Power
  • RF circuit
  • Robotics
  • Security and other sensors and detectors
  • Telephone related
  • Test and measurement
  • Video and TV

    • Electronics guide

  • The very first steps
  • On the boards
  • Measuring current and voltage
  • Capacitors
  • ICs, oscillators and filters
  • Diodes I
  • Diodes II
  • Transistors
  • Analogue integrated circuits
  • Digital integrated circuits I
  • Digital integrated circuits II
    		•

    Sitemap

    Audio
    1. 1.5W Audio power amplifier (12V)
    2. 10 Band Audio Equalizer
    3. 100W Audio Amplifier
    4. 100W Guitar Amplifier
    5. 100W RMS Amplifier
    6. 10W Audio Amplifier with Bass-boost
    7. 10W Audio Power Amplifier
    8. 10W Mini Audio Amplifier
    9. 16w Bridge Amplifier
    10. 18W Audio Amplifier
    11. 1W Bass Power Amplifier
    12. 200W audio amplifier
    13. 20W Power Amplifier
    14. 22 Watt Audio Amplifier
    15. 22W Stereo Amplifier
    16. 250 mW Audio Amplifier
    17. 25W Mosfet audio amplifier
    18. 3 Channel Spectrum Analyzer
    19. 3 Line Mixer
    20. 3 Transistor Audio Amp (50 milliwatt)
    21. 5 band graphic equalizer using a single IC/chip
    22. 5 Watt Class-A Audio Amplifier
    23. 50 Watt Amplifier
    24. 60W Bass Amplifier
    25. 60W Guitar Amplifier
    26. Amplified Ear
    27. Amplifier 2x30W with STK465
    28. Amplifier of acoustic frequencies with preamplifier
    29. Audio Distribution Amplifier
    30. Audio Visual Indicator for Telephones
    31. Automatic Loudness Control
    32. Bass-treble tone control circuit
    33. Bass-treble tone control circuit
    34. Baxendall Tone Control
    35. Classic Audio Mixer
    36. Digital Volume Control
    37. Digital Volume Control
    38. Digital Volume Control
    39. Electret Microphone Pre-Amplifier
    40. Electronics Attenuator
    41. FET Audio Mixer
    42. Guitar Amplifier
    43. Headphone Amplifier
    44. Improved 3 Transistor Audio Amp (80 milliwatt)
    45. Infrared Head Phones
    46. Low cost intercom using transistors
    47. Low impedance microphone amplifier
    48. Mini-box 2W Amplifier
    49. Musical Instrument (Expandable) Graphic Equaliser
    50. Phono Preamplifier
    51. Portable Headphone Amplifier
    52. Portable Microphone Preamplifier
    53. Portable Mixer
    54. Precision Audio Millivoltmeter
    55. Simple Intercom
    56. Sound Controlled Filp Flop
    57. Sound Level Meter
    58. Sound Pressure Level Meter
    59. Speaker Microphone
    60. Speech Recorder
    61. Stereo Channel Selector
    62. Stereo Preamplifier with Bass-boost
    63. Stereo Tone Control
    64. Stereo Tube Amplifier
    65. Surround Sound Decoder
    66. Three-Level Audio Power Indicator
    67. Two transistor audio amplifier circuit
    68. Two way cross-over 3500 Hz
    69. Ultrasonic pest repellent
    70. Ultrasonic Switch
    Automotive
    1. Automatic Headlight Brightness Switch
    2. Capacitor Discharge Ignition Circuit (CDI)
    3. Car Battery Charger
    4. Charge Monitor for 12V lead acid battery
    5. Dome light dimmer for Cars
    6. Headlight Flasher
    7. Headlights Timer
    8. Intermittent wiper controller
    9. Lighting Third Brake Light
    10. Nite Rider Lights
    11. Park-Aid
    12. Pulsing Third Brake Light
    13. Simple but reliable car battery tester
    14. Speed-limit Alert
    15. Synchronized multi-spark module (SMSM) for Electronic Ignition Devices (EID)
    16. Ultrasonic Parking Sonar
    17. Wiper Speed Control
    Games and entertainment
    1. 3V LED Chaser
    2. 6V Ultra-Bright LED Chaser
    3. Electronic Scoring Game
    4. Game Show Indicator Lights (Who's First)
    5. JAM(Just A Minute) Circuit
    6. Pinewood Derby Finish Line Lamps
    7. The flashing Heart
    8. The Millipede
    9. TV remote control Blocker
    Microcontrollers
    1. "SimpleMouse" Smartcardprogrammer
    2. ATMEL 89 Series Flash Microcontroller
    3. EPROM adapter for ATMEL 89 Series Flash Microcontroller Programmer Ver 2.0
    4. Funcard Programmer by Diesel
    5. Gold wafer cards
    6. Phoenix Programmer
    7. PIC diode tester
    8. Ponyprog Circuit for ATMEL'S AVR
    9. Producing your own Decrypt Viewing Card Mk2
    10. Programmers for Jupiter Card
    11. Servo Motor Control with PIC16F84
    12. Telephone operated remote control using PIC16F84A microcontroller
    Miscellaneous
    1. 7 Segment LED Counter
    2. Cellular Phone calling Detector
    3. Cuckoo sound Generator
    4. Digital Step-Km Counter
    5. Economical Pump Controller
    6. Economy radar detector
    7. Flyback Transformer Driver
    8. Intercommunication (Intercom)
    9. Keys Finder
    10. Nocturnal Animals Whisker
    11. One-IC two-tones Siren
    12. Pot plant water tester
    13. Programmable Digital Code Lock
    14. S-video to RCA
    15. Simple Lie Detector
    16. SmartCard PC Emulator
    17. Time Delay Relay
    18. Time Delay Relay II
    19. Ultrasonic Pest Repeller
    20. Whistle Responder
    Models and model remote control
    1. Clap Activated Remote
    2. Deluxe Charge Rate Limiter for Small Capacity NiCad Batteries
    3. Discharger for Receiver Battery Packs
    4. Downed Model Locator
    5. Downed Model Locator II
    6. Infra Red Switch
    7. Infrared Remote Control
    8. Multi Rocket Launcher
    9. Precision Receiver Battery Low Voltage Alarm
    10. Radio Remote Control using DTMF
    11. Receiver Battery Low Voltage Alarm
    12. Remote control using telephone
    13. Remote control using VHF modules
    Motor, light and power control
    1. 1.5 Hour Lamp Fader (Sunset Lamp)
    2. 12 Stage Neon Sequencer (NE-2 / NE-51)
    3. 12 Volt Lamp Dimmer
    4. 120VAC Lamp Chaser
    5. 12VDC Fluorescent Lamp Driver
    6. 16 Stage Bi-Directional LED Sequencer
    7. 18 Stage LED Sequencer
    8. 220 Volts Flashing Lamps
    9. 25 Light Sequencer using Xmas lamps
    10. 6 Channel Auto Reverse Sequential
    11. 60 Light Sequencer using a Matrix
    12. 73 MHz Hallogene Lamp Radio-Controlled
    13. Adjustable Strobe Light
    14. Alternating Flasher
    15. Audio Light Modulator
    16. Auto Heat Limiter for Soldering Iron
    17. Automatic 12 Volt Lamp Fader
    18. Automatic Dual output Display
    19. Automatic Room Lights
    20. Automatic Speed Controller for fans & Coolers
    21. Battery-powered Night Lamp
    22. Bicycle back Safety Light
    23. Black Light
    24. Brightness Control for small Lamps
    25. Brightness of multiple displays control circuit
    26. Christmas Star
    27. Courtesy Light
    28. Dancing LEDs
    29. Dark-activated LED or Lamp Flasher
    30. DC Motor Control Circuit
    31. DC Motor Reversing Circuit
    32. Digital Stopwatch 0-60sec
    33. Discrete component motor direction controller
    34. Discrete component motor direction controller
    35. Dome Lamp Dimmer
    36. Emergency Light
    37. Expandable 16 Stage LED Sequencer
    38. Fading LEDs
    39. Fancontrol
    40. Flashing Neons (NE-2 / NE-51)
    41. Flashy Christmas Lights
    42. High And Low Voltage Cut Off With Time Delay
    43. Infa-Red Remote Control
    44. Interfacing 5 volt CMOS to 12 volt/ 25 Watt Loads
    45. IR Remote Control Jammer
    46. Knightrider lights for model cars
    47. LASER Transmitter/Receiver
    48. LED Chaser
    49. LED or Lamp Flasher
    50. LED or Lamp Pulser
    51. LED Photo Sensor
    52. LEDs or Lamps Sequencer
    53. Light Activated Relay
    54. Light Flasher
    55. Optical toggle switch using a single Chip
    56. Pulse Width Modulation DC Motor Control
    57. PWM Motor/Light Controller
    58. Running Message Display
    59. Simple DC motor PWN speed control
    60. Solid State Power Controller
    61. Stepper Motor Controller
    62. Sunrise Lamp
    63. Super simple stepper motor controller
    64. Temperature-controlled Fan
    65. Touch Activated Light
    66. TRIAC Light Dimmer
    67. Triple Stroboscope
    68. Two-wire Lamp Flasher
    69. Unipolar Stepper Motor Controller
    Oscillators and timers
    1. 1KHz Sinewave Generator
    2. 28 LED Clock Timer
    3. 28 LED Clock Timer
    4. 50 Hertz LED Clock Timebase
    5. 72 LED Clock
    6. 9 Second Digital Readout Countdown Timer
    7. 9 Second LED Timer and Relay Circuit
    8. Amplifier Timer
    9. Bedside Lamp Timer
    10. Headlights Timer
    11. Jogging Timer
    12. Low Frequency Sinewave Generators
    13. Low Voltage, High Current Time Delay Circuit
    14. Low-distortion Audio-range Oscillator
    15. Mini Metronome
    16. Photo Timer Circuit
    17. Precision Metronome and Pitch generator
    18. Pulse-Generator & Signal-Tracer
    19. Reverse Bias Oscillator
    20. Sawtooth wave generator
    21. Self-powered Sine to Square wave Converter
    22. Simple IF Signal Generator
    23. Simple variable frequency oscillator
    24. Tan Timer
    25. Timed Beeper
    26. Triangle and Squarewave Generator
    PC related
    1. 3-Axis Stepper Controller
    2. 4 - Channel Digital Logic Analyzer and 5 Channel Digital Oscilloscope by using PC Parallel Port
    3. 7 segment rolling display using PC
    4. 8 Channel software controlled fanbus with PWM
    5. A Laboratory Control System for Cold Atom Experiments
    6. A Worked Stepping Motor Example
    7. An Improved Infrared Receiver with Status LED
    8. Build your own printer cable LCD Display
    9. Casio data logger
    10. Control electrical appliances using PC
    11. DS1620 based USB Digital Thermometer
    12. DS1621 pc thermometer
    13. Improved Infrared Receiver with status led
    14. IrDA interface for your mainboard
    15. LCD Module Control with PC
    16. LCD2LPT with LIRC
    17. Monitor Your PC's CPU Core Temperature
    18. Opto-Isolated Stepper Motor Controller
    19. Parallel Port Relay Interface
    20. PC based Frequency Meter
    21. PC Serial Receiver (57.6K Baud / TTL & CMOS)
    22. PC Thermometer V2
    23. Reading Data From The Parallel Port
    24. RJ45 Network card to IR communication
    25. RS-232 Laser Transceiver
    26. Simple Analog to Digital Converter
    27. Simple PC thermometer
    28. Stepper motor controller
    29. The 8Way Relay Board
    30. The Relay Sub Board
    31. The Simplified I/O Interface
    32. Use the CD-ROM drive as a audio CD player without the computer
    33. VGA to TV Scart
    Power
    1. 0-30 vdc stabilized power supply with current control 0.002-3 a
    2. 0-50V 2A Bench power supply
    3. 10 Amp 13.8 Volt Power Supply
    4. 12 Volt 30 Amp PSU
    5. 120 VAC Lamp Dimmer
    6. 12V Inverter
    7. 13.8V 20A power supply
    8. 2 Watt Switching Power Supply
    9. 2W Switching Power Supply
    10. 3-30 V/2.5 A Stabilized power supply
    11. 500W low cost 12V to 220V inverter
    12. 5V/1A Power Supply
    13. 6V to 12V Converter
    14. A simple step-up converter (6V to 12V)
    15. AC Current Monitor
    16. Basic UPS Power Supply
    17. Batteries charger & PSU - ideal for digital cameras
    18. Constant Current Battery Charger
    19. DC to DC Converter
    20. Dual Polarity Power Supply
    21. Dual Regulated Power Supply
    22. Fixed Voltage Power Supply
    23. Fuse Monitor / Alarm
    24. High and Low Voltage Cutout with delay and Music
    25. High Current Power Supply
    26. High Voltage, Low Current Supply
    27. Instrument panel lamp dimmer control
    28. Inverter
    29. LASER Power Supply
    30. LM317 VARIABLE POWER SUPPLY
    31. Negative Supply from single positive Supply
    32. Ni -Cd Batteries Charger
    33. Ni-Cd Battery Auto Charger
    34. Nicad Battery Charger
    35. NiCd - NiMH Charger
    36. Over / Under Voltage Cut-Out
    37. Portable CD Player Adapter For Car
    38. Power-Off Time Delay Relay
    39. Power-On Time Delay Relay
    40. Pulse Charger for reviving tired Lead Acid batteries
    41. Regulated 12 Volt Supply
    42. Self switching Power Supply
    43. Self-powered Fast Battery-Tester
    44. Simple Car Battery Charger
    45. Solar charger for lead-acid batteries
    46. Solid State Tesla Coil/High Voltage Generator
    47. Transformerless Power Supply
    48. TTL Power Supply with ‘Crowbar’ protection
    49. Ultra low drop linear voltage regulator
    50. Variable 3 - 24 Volt / 3 Amp Power Supply
    51. Variable DC Power Supply
    52. Variable Voltage and Current Power Supply
    53. Varying brightness AC lamp
    54. Voltage Inverter
    55. Voltage Inverter II
    56. Whistle On - Whistle Off
    RF circuit
    1. 1 Watt C-Class RF Amplifier
    2. 15W Fm-transmitter
    3. 2 Transistor FM Voice Transmitter
    4. 20dB VHF Amplifier
    5. 3W FM Transmitter
    6. 4 Band Double Tuned Preselector
    7. 4 Transistor Transmitter
    8. 4 Watt FM Transmitter
    9. 40 meter Direct Conversion Receiver
    10. 4W FM Transmitter
    11. 6 x 6 Loop Antenna
    12. 60W Linear amplifier
    13. A small FM transmitter (SMD)
    14. Active Antenna for Medium Wave
    15. AM FM Simultaneous Transmitter Using Digital IC
    16. AM Receiver
    17. AM To FM converter
    18. AM Transmitter
    19. Band 2 Preamplifier
    20. Bipolar Regenerative receiver
    21. CB receiver
    22. CB transmitter
    23. Coil-less FM Transmitter
    24. Coilless FM transmitter
    25. Economy short-wave receiver
    26. Electronic Eavesdropping Devices Detector
    27. Field Strength Meter
    28. FM Beacon Broadcast Transmitter (88-108 MHz)
    29. FM radio
    30. FM transmitter
    31. FM Transmitter Bug
    32. FM Transmitter with Opamp
    33. FM voice transmitter for Band 2 VHF
    34. Linear FM 30Watt
    35. Linear FM 50Watt with BLY90
    36. Long range FM transmitter
    37. Low Distortion Crystal Oscillator
    38. Low-Frequency Crystal Controlled Oscillator
    39. Medium range transmitter
    40. Micro Power AM Broadcast Transmitter
    41. MK414 SW Receiver
    42. MK484 Portable Receiver
    43. MPF102 FM Receiver
    44. One Transistor FM Radio
    45. Powerful AM transmitter
    46. Sensitive Field Strength Meter
    47. Simple FM Transmitter
    48. Simple Op-Amp Radio
    49. Small Radio Transmitter
    50. Surveillance Transmitter Detector
    51. SW RF Pre-Amplifier
    52. Transmitter FM 45W with valve
    53. TV Signal Amplifier
    54. VHF Audio Video Transmitter
    55. VHF Video Transmitter
    56. Video Signal Amplifier
    57. Video to RF Modulator
    58. ZN414 Portable AM Receiver
    Robotics
    1. 12-way Input/Output Interface
    2. 5-motor walker circuit
    3. 90S2313 AVR Robot Board
    4. IR Detector for Robotics
    5. Line Robot
    6. RF Modem Robotics Project
    7. Walker Robot
    Security and other sensors and detectors
    1. 4 channel Telemetry System
    2. 4 in 1 Burglar Alarm
    3. A simple electronic buzzer
    4. Beeper
    5. Big Ben Sound
    6. Brakelight Flasher
    7. Capacitive Sensor
    8. Car anti theft wireless alarm
    9. Color Sensor
    10. Combination Lock
    11. DayLight Alarm
    12. Dew sensor
    13. Digital Remote Thermometer
    14. Door Alarm
    15. Electronic detector of air flow
    16. Electronic Lock
    17. Electronics Telephone Talking Circuit
    18. Emergency Light & Alarm
    19. Factory Siren
    20. Field-strength meter
    21. Fire Alarm
    22. Fridge door Alarm
    23. Frost Alarm
    24. Heating System Thermostat
    25. Infra-red Level Detector
    26. Infrared Alarm
    27. Infrared beam barrier/ proximity sensor
    28. Infrared emitter and infrared Reciever
    29. IR Remote Control Extender Circuit
    30. IR transceiver 1.0
    31. Light Barrier Detector
    32. Light switch
    33. Light/Dark Detector
    34. Live-line Detector
    35. Low Voltage Alarm
    36. Magnetic proximity sensors
    37. Mains Remote-Alert
    38. Melody generator for greeting cards
    39. Metal Detector
    40. Metal Detector
    41. Police Siren
    42. Power supply failure alarm
    43. Proximity Alarm
    44. Rain Alarm
    45. Remote Doorbell Warning Switch
    46. Room Noise Detector
    47. Sound Operated Switch
    48. Temperature Sensor with Digital Output
    49. Theft preventer alarm
    50. Touch Switch II
    51. Tough switch
    52. Ultra-simple Voltage Probe
    53. UltraSonic Radar
    54. Ultrasonic switch
    55. Voice activated switch
    56. Water Level Indicator with alarm
    Telephone related
    1. Audio Visual Ringer
    2. Conversation Recorder
    3. Cordless phone backup
    4. Cut Phone Line Detector
    5. Detector of cellular phone incoming call
    6. FM Telephone Bug
    7. Having secrecy in parallel telephones
    8. Multipurpose Circuit for telephone
    9. Off line Telephone tester
    10. Phone "Hold" With Music
    11. Phone Broadcaster
    12. Phone Busy Indicator
    13. Phone line indicator
    14. Ringing Phone Light Flasher
    15. Simple Phone Tap
    16. Smart Phone light
    17. Soft Musical Telephone Ringer
    18. Telephone amplifier
    19. Telephone Audio Interface
    20. Telephone call meter using calculator & COB
    21. Telephone Headgear
    22. Telephone Hold Button
    23. Telephone line based audio muting and light on circuit
    24. Telephone line monitor
    25. Telephone Line Vigilant
    26. Telephone Number Display
    27. Telephone Ringer using 556 dual timers
    28. The Link 4+0 – Internal Intercom
    29. The Link A2B+1 (the Link Telephone Intercom - DTMF version)
    30. The Link Telephone Intercom – Every Home Should Have One!
    31. The Original 2 Phone Link Design
    32. Two line intercom plus a telephone changeover switch
    Test and measurement
    1. Inductive meter adapter
    2. 12V Lead-Acid Battery Monitor
    3. 1GHz Simple Frequency Counter
    4. A simple Remote control Tester
    5. AC Line Current Detector
    6. Audio level meter (vumeter)
    7. Beeper to find short circuits
    8. Capacitance Meter
    9. Car Water Temperature
    10. Contactless Mains Voltage Indicator
    11. Continuity Tester
    12. Crystal Tester
    13. Decibel Meter
    14. Digital Voltmeter
    15. Digital Voltmeter
    16. Electronic Thermostat and Relay Circuit
    17. Frequency Comparator
    18. Function Generator
    19. High Resistance Voltmeter
    20. IR Remote Control Tester
    21. Latching Continuity Tester
    22. Led display digital Voltmeter
    23. Linear Resistance Meter
    24. Mosfet TESTER
    25. Oscilloscope testing module (huntron circuit)
    26. Picoammeter circuit with 4 ranges
    27. Thermostat for 1KW Space Heater (SCR controlled)
    28. Transistor Tester
    29. Triangle / Squarewave Generator
    30. Voltage follower with 1G ohm input resistance
    31. Voltage Monitor
    32. XTal Tester
    33. XTal Tester
    34. Zener Diode Tester
    Video and TV
    1. 4 Stage 555 Timer for Video Cam Control
    2. Audio / video switch
    3. Composite color video signal travels on twisted-pair cable
    4. Driver for Multiple VGMonitors
    5. Isolation between antenna network and TV/radio equipment
    6. LH0032 Video Amplifier
    7. S-video to composite video adapter
    8. The Video / Audio Distribution Amplifier
    9. UHF Preamplifier
    10. Video Clock and Message Generator
    11. Video Distributor Amplifier
    12. Video Line Selector
    13. Video monitor adapter enhances oscilloscope
    14. Video multiplexer uses high-speed op amps
    15. Video Signal Amplifier
    16. Video Switch
    17. Video/Audio Wireless Transmitter
    Total 529 pages

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