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The Circuits.dk web site is dedicated to electronic engineers, developers, inventors, consultants, students, and hobbyists. Here you can find useful schematics, mainly focused on small electronic circuit building blocks, but also complete applications and reference designs. In addition you will find useful tutorials, electronic related articles, and science projects. We hope you will enjoy this site and we hope it's content will increase your knowledge and help you during the design phase of your current and future great electronic projects.

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This is our collection of free circuits schematics made exclusively available to you. Some of the circuits are designed by me, some are links to good schematics. All circuits have a brief description which we hope will be enough so that you effortlessly will understand how the circuit works. If something is not clear or you have other questions, we advice you to post your questions on the online community forum, where you can get expert help.....fast.
The links below are currently not working....... AC Power Controls Circuits
AC to AC Converters
AC to AC Power Supplies
AC to DC Converters
AC to DC Power Supplies
Acceleration Sensors / Monitors
Acoustic Circuits
Active Antenna
Active Filter circuits
All pass, Band pass, High pass, Low pass, Notch.
Acquisitions Data Circuits
Air Conditioning Circuits
Air Flow Monitors
Aircraft Receivers
Alarm Circuits
Alarm and security circuits
Burglar, smoke, water
AM (Amplitude Modulation) Circuits
AM Receiver Circuits
AM Transmitter Circuits
Amp Meters
Amplifiers
Audio Differential High Frequency High Gain High Impedance High Speed Instrumentation Limiting Logarithmic Low Noise Microwave Operational Power RF (Radio Frequency) Trans impedance Variable Gain Video
Amplifier circuits
Instrumentation amplifiers, differential amplifier, inverting amplifier, dc amplifier, summing amplifier, buffered amplifier
Audio Mixers
Audio Oscillator Circuits
Amplitude Modulation (AM) Circuits
Analog to Digital (A/D) Circuits
Analog Multipliers
Analog Switches
Anemometer Circuits
Annunciator Circuits
Antenna Circuits
Astable Circuits
Attenuators
Audio Amplifiers
Audio Circuits
Accessories Intercom Level, Tone and Balance Controls Mixers Power Amplifiers Preamplifiers Stereo Surround Sound
Audio Mixers
Audio Oscillator Circuits
Automatic Frequency Controls
Automatic Gain Control (AGC) Circuits
Automatic Level Control Circuits
Automotive Circuits
Balance Controls
Band-Pass Filters
Active
Battery Backup Circuits
Battery Chargers
Battery Monitors
Battery Testers
Barometer Circuits
Beeper Circuits
Biomedical Circuits
Bistable Multivibrators
Bridge Circuits
Buffer Circuits
Bug killer circuits
Burglar Circuits
Buzzer circuits
Camera flashers
Capacitance Sensors
Capacitance Switches
Capacitors (Super) Circuits
Carrier Current Transceivers
Charge Pump Circuits
Chopper Circuits
Clock Circuits
Code Practice Circuits
Color Organ Circuits
Colpits Oscillators
Compandor Circuits
Comparator Circuits
Computer Cables
Computer Interface
Contact Bounce Suppression Circuits
Control Circuits
Converters
AC to AC AC to DC Analog to Digital (A/D) Current to Voltage DC to AC DC to DC Digital to Analog (D/A) Frequency Frequency to Voltage Period to Voltage RF (Radio Frequency) Sine to Square Wave Voltage Voltage to Current Voltage to Frequency Wide Band
Constant Current Circuits
Cooling Fan Controls
Cosine
Counter circuits
Crystal Oscillators
Crystal Filters
Cube Root circuits
Current limiters
Current Loop Circuits
Current Meters
Current Mirrors
Current Sensors / Monitors
Current Source/Sink Circuits
Current to Voltage Converter
Current Transformer Circuits
Data Acquisitions Circuits
Data Logging circuits
DC to AC converters
DC to AC cower Supplies
DC to DC converters
DC to DC power supplies
Decibel Meter
Decoder Circuits
Delay Circuits
Demodulators
Dew Point Meters
Differential (Difference) Amplifier Circuits
Differentiator Circuits
Digital Circuits
Digital Readouts
Digital to Analog (D/A) Converters
Dimmer Circuits
Direction Finder Circuits
Discriminator Circuits
Display Circuits
Distance Monitors
Divider Circuits
Doorbell Circuits
Driver Circuits
DTMF (Dual Tone Multi Frequency) Circuits
Electronic Bugs & Detectors
Electronic Locks
Emergency Light Circuits
Encoder Circuits
FET Circuits
Fiber Optic Circuits
Field Strength Meters
Flashers and Blinkers
Flip/flop Circuits
Flyback Converter Powersupply Circuits
Fluid Level Monitors
Fluorescent Lamp Circuits
FM (Frequency Modulation) Circuits
Forward Converter Powersupply circuits
Freespace Communications
Freezer Alarm
Frequency Converters
Frequency Counters
Frequency Divider Circuits
Frequency Doublers
Frequency Meters/Monitors
Frequency Multipliers
Frequency Shift (FSK) Circuits
Frequency Synthesizer Circuits
Frequency to Voltage Converters
Frost/Freeze Alarm
Fullbridge Converter Circuits
Function Generators
Game Circuits
Gas Detectors
Gate Arrays
Geiger Counter Circuits
Geophone Circuits
Global positioning Circuits
GPS circuits, compass circuits
Ground current monitors
Ground fault interrupters
Ground leakage current measurement
Halfbridge Converter Circuits
Hall Effect Circuits
High Impedance Circuits
High-Pass Filters
Active Passive
High Speed/Frequency Circuits
High Voltage Generators
Hour Meters
Human Motion Detectors
Human Proximity Detectors
Human Touch Detectors
Humidity Sensors and Monitors
Indicator Circuits
Infrared Circuits
Insect killer circuits
Instruments
Instrumentation Amplifiers
Intercom Circuits
Interface Circuits
Inverter Circuits
Ion Generator Circuits
Joysticks
Keypad Circuits
Ladder Networks
Lamp/Light Control Circuits
Laser Circuits
Latch Circuits
LCD (Liquid Crystal Display) Circuits
LED (Light Emitting Diodes) Circuits
Level, Tone and Balance Controls
Lie Detector Circuits
Light Dimmers
Light Dependent Resistor Circuits
Light Detectors
Light Flashers
Light-Beam Communications
Limiter Circuits
Limiting Amplifiers
Liquid Crystal Displays (LCD)
Liquid Detectors / Sensors
Liquid Level Monitors
Lock Circuits
Logarithmic Circuits
Logic Circuits
Low Noise Amplifiers
Low-Pass Filters
Active Passive
Magnetic Sensors
Math Function
Cosine, Cube Root, Differentiator, Log, Multiply, Square Root
Maximum power point tracking circuits (MPPT)
Measurement and test circuits
Medical Electronics Circuits
Metal Detectors
Metronomes
Microphone Circuits
Micro Power Circuits
Microprocessor Circuits
Microwave Amplifiers
Microwave Detectors
Millivolt Meters
Miscellaneous Circuits
Mixer Circuits
Model Train Circuits
Modem Circuits
Modulator Circuits
Moisture Monitors
Monostable
Morse-Code Circuits
MOSFET Circuits
MOSFET high side driver circuits
MOSFET low side driver circuits
Motion Sensor
Motor Controls
Multiplexers
Multivibrator Circuits
Musical Circuits
Noise Generator Circuits
Noise Reduction Filters
Notch Filters
Active, Passive.
One Shot Circuits
Operational Amplifier Circuits
Optic Circuits
Optical Fiber Circuits
Optical Sensors
Opto-Isolator Couplers
Oscilloscope Circuits
Oscillators
Astable, Audio, Colpits, Crystal, RF, Sine wave, Square wave, Triangle wave, Voltage Controlled, Wein bridge.
PA, Public Address, Circuits
Passive filters
Including low pass, band-pass, notch, crystal and high pass
Peak detectors
Period to Voltage converter
Pest control Circuits
Phase detector
Phase locked loop (PPL) Circuits
Phase modulation (PM) Circuits
Phase shifting keying (PSK) Circuits
Photo cell Circuits
Photoelectric Circuits
Photo-Flash Circuits
Photography Circuits
Photovoltaic Circuits
Piezoelectric Circuits
Pink Noise Generator Circuits
Position Monitors
Potentiometer Circuits
Power Amplifiers
Power Control Circuits
Power Failure Alarm
Power FET Circuits
Power Line Circuits
Power Meters/Monitors
Power Supplies
AC to AC, AC to DC, DC to AC, DC to DC, High Voltage power supplies, Low Voltage Drop regulators, Switch mode power supplies,Uninterruptable power supplies (UPS), Variable,Laboratory,Flyback,Forward,Power factor corrected(PFC), push pull, phase shifted, hysteretic.
Preamplifiers
Pressure Sensors
Probe Circuits
Programmable gain amplifier Circuits
Protection Circuits
Over current and overvoltage protection
Proximity Circuits
Pulse Generator
Pulse Width Modulation (PWM) Circuits
Push-Pull Converter Circuits
Quadraphonic Circuits
Quadrature detectors
Radar Circuits
Radar detectors
Radiation detectors
Radiation monitors
Radio control Circuits
Radio frequency identification devices (RFID)
Rain detector circuits
Rain gauge circuits
Receiver Circuits
Rectifier Circuits
Reference Circuits
Regulated Power Supply Circuits
Regulator Circuits
Relay Circuits
Remote Control Circuits
Including RC5 encoder / decoder standard
Resistance Meters
RF (Radio Frequency) Amplifiers
RF (Radio Frequency) Converters
RF (Radio Frequency Mixers
RF (Radio Frequency Oscillators
RF (Radio Frequency) Receivers
RF (Radio Frequency) Transmitters
RFID (Radio Frequency Identification Device)
RMS (Root Mean Square) Meters
Robot Circuits
Rocket Circuits
Rotation Monitors
RPM (Revolutions Per Minute) Monitors
Safety Circuits
Seminar TI powersupply design compendium
Sample and Hold Circuits
Sawtooth Generator Circuits
Scanner Circuits
Schmitt Trigger
SCR (Silicon Controlled Rectifier) Circuits
Security Circuits
Seismic Monitors
Sensors / Detectors
Accelerations, Air Flow, Automotive, Capacitance, Current, Distance, Frequency, Gas, Human Motion, Human Proximity, Human Touch, Humidity, Light, Liquid, Magnetic Sensors, Metal, Microwave, Moisture/Water, Motion Sensor, Peak Detectors, Phase Detectors, Position, Pressure, Proximity, Radar, Radiation, Resistance, RF (Radio Frequency), Rotation, Seismic, Solar Energy, Smoke, Temperature, Vibration, Voltage, Water/Moisture, Wind Speed.
Servo Circuits
Shunt Regulators
Signal Generators
Signal Injectors
Sine to Square Wave Converters
Sine-Wave Generators
Sine Wave Oscillators
Siren Circuits
Solar Cell Circuits
Including solar controllers, solar regulators, and solar tracking systems
Solar Energy Monitors
Solenoid Circuits
Solid State Relays
Sound Effect Circuits
Sound Level Monitors
Sound Synthesizer
Sound Operated Circuits
Square Wave Generators
Square Wave Oscillators
Strain Gauge Circuits
Stepper Motor Circuits
Stereo Circuits
Strobe Circuits
Super Capacitor Circuits
Surround Sound Circuits
Fishing circuits
Electronic lure
Sweep Circuits
Switch Circuits
Switch Mode Power Supplies
SMPS Circuits
Sync Circuits
Synthesizer Circuits
T/R (Transmitter/Receiver) Switch Circuits
Tachometer Circuits
Telecommunication
GSM module and GSM/GPRS module related applications and circuits. Including M2M applications
Telemetry Circuits
Telephone Circuits
Telephone Ringers
Television Circuits
Television/VCR Remotes
Temperature alarms
Temperature compensation Circuits
Temperature control circuits
Temperature censors
Tesla Coil circuits
Testers
Theremin Circuits
Thermistor Circuits
Thermocouple Circuits
Thermometers
Thermostat circuits
Tilt Meters
Time Delay Circuits
Timer circuits
The popular 555 timer and circuits
Tone Controls
Torque Circuits
Touch Switch Circuits
Track and Hold Circuits
Train (Model) Circuits
Transceiver Circuits
Transformer Circuits
Transimpedance Amplifiers
Transistor Circuits
Transceiver Circuits
Transmitter Circuits
Triac Circuits
Triangle Wave Generators
Triangle Wave Oscillators
Triggering Circuits
UHF (Ultra High Frequency) Circuits
Ultrasonic Circuits
UPS (Uninterruptable Power Supplies)
Vacuum tube circuits
Vapor detector circuits
Variable Gain Amplifiers
VCO (Voltage Controlled Oscillator) Circuits
Very High Frequency (VHF) Circuits
Video amplifiers
Video Circuits
Voltage Comparators
Voltage Converters
Voltage Monitor circuits
Voltage Multiplier circuits
Voltage reference circuits
Voltage Regulator circuits
Voltage to Frequency Converters
Voltmeters
VU (Volume Unit) Meters
Water Sensors
Water Level Monitors
Watt Hour Meter Circuits
Waveform Generators
Wave-shaping Circuits
Weather instruments
White noise generators
Wide band circuits
Wind energy circuits
Wind speed/Direction Monitor
Window Comparator Circuits
Wireless microphones
Wireless telephones
Wire tracer
Xenon lamp Circuits
Yag laser Circuits
Zero cross detectors
Zero offset circuits

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