Get the RSS FeedAlarms-and-Security
motorcycle alarmelectronic combination lock
Combination Lock (PIC16F84)
single zone alarm
Door knob alarm
Audio Power Amplifier
Audio Amp Output Power Limiter2304 and 3456 MHz Power Amplifiers
Death of Zen (DoZ) – A New Class-A Power Amp
20 Watt Class-A Power Amplifier
El-Cheapo – A Really Simple Power Amplifier
Audio preamp circuits
Microphone amplifierbalanced microphone preamp
fet preamp cable
Low impedance microphone amplifier
RIAA phono amplifier
Automative car and motorcycle
synchronized multi spark module smsmElectronic auto stethoscope
Turn signal alarm
Headlight flasher
Car battery voltage tester using LM3914
Data acquisition and data logging
Capacitance type liquid level measurementStrain gauge sensor
Digital compass schematic
Rain detector
Air flow detector
Filter
Narrow band audio bandpass filterActive bandpass filters
29.85 MHZ notch filter schematic
Low-pass active filter
Filter Circuit for the Earthworm Seismic
Games and fun stuff
Gyrus Arcade Game (800k ZIP)GameBoy ROM+RAM+MBC1 Cart Schematic
E.S.P. Conjuring Trick
GameBoy Power & Cartridge schematic
Xevious Arcade Game (450k ZIP)
Infrared based
Digibox interfaceInfrared transmitter for locomotives
Wireless IR headphone transmitter
Pyroelectric Infrared Sensor
Infrared link for 10-BASE-T
Laser related power supplies and data transmission
12V supply for He-Ne laserLaser transmitter/receiver
Laser transmitter schematics
20MHz VCSEL 3mW laser test circuit (PDF)
Digital radar speedometer
LED related
Knight rider scanning LED lights9 Second LED Relay Timer
LED Audio VU Meter
IR Illuminator
Flashing Christmas LED display
Lighting
RHINO8 EL SequencerMicrocontroller Multichannel Light Dimmer
Touch Activated Lamp
Sequencing Neons (NE-51 / NE-2)
120VAC Lamp Chaser Using Solid State Relays
Medical and health
Simple lie detectorHeartbeat transducer
EKG/EEG circuit
Lie detector
Electronic Stethoscope
Microcontroller
PIC16F84 TRIAC / IGBT brightness phase controllerPIXpand
Motorola 68HC11 evaluation board
AT89C2051/4051connecting dumb terminal
Ser-Key 10-Key Serial Keypad Encoder
Miscellaneous Audio
Intercom preampMagnetic cartridge amplifier
Simplest Ever Amplifier Bridging
Warbler
Improved PL tone decoder
Miscellaneous Schematics
Broadband 5MHz optical fiber receiver (PDF)1uS light pulse receiver plus post amp (MISC)
MAX924 bar-graph level gauge
Electroscope
Electronic fish lure
Model and remote control
Model rocket launch controller0-10V control for RC servos
Pad launch controller for model rockets
tw1o tone train horn
Incline Railway Control Circuit
Motor and general control
Stepper motor controllerPushbutton one-shot and latch (PDF)
Pulse Width Modulation DC Motor Control
PWM DC motor control with SG3525
Programmable light-activated relay
Music related schematics
Wave Multiplier for music synthesizersMiniature metronome
Electronic metronome
MIDI Controller Footpedal
Guitar fuzz effect
PC related
Dive computer interfaceRS-232 line monitor and loopback cables
PC interface for point controller
PC thermometer
Sound Blaster Microphone Preamplifier
PDA interfaces and related
Hamamatsu UVTron Interface to a BrainStemPalmPilot serial port interface
IBM PC keyboard to PalmPilot interface
Wireless local netw1ork for PalmPilot (large PDF)
Aladin interface using op-amp
Power supplies and control
Simple power supplyLow Power DC to DC Converter
Nagative voltage generation using 555 timer
LM317 Variable Voltage Regulator
Valve power supply
Radio-frequency
SOP receiver (PDF)Assorted RF circuits
Variety of receiver converter projects
14MHz SSB 10mW Transceiver
Improved FM Stereo Modulator
Solar Powered
FLED solar engineSolar cell Nicad charger
Solar robots
LED7 solar tracker
Solar tracking control system
Telephone and intercom
Universal telephone holdPhone to audio interface
Telephone Line Monitor
Soft musical telephone ringer
Cellular Phone calling Detector
Test equipment
Audio MillivoltmeterFrequency and capacitance meter
ESR Meter
Pink Noise Generator for Audio Testing
Line Output / Flyback transformer tester
Timing oscillators
Clock dividerAstable Multivibrator
Line powered 60Hz clock generator (PDF)
Budget timer
High Precision GPS/TV controlled Reference Oscillator
Transmitter RF
Simple RF transmitter4 watt FM transmitter
Small Radio Transmitter
Small radio transmitter
Low Power FM Transmitter
Uncategorized
Designing With the LMC835 Digital Controlled Graphic EqualizerDigital Delay Unit for Surround Sound
Soft Switching Amplifier With Tone Controls
Musical Instrument (Expandable) Graphic Equalizer
Better Volume Control
Video
LM359N video amplifierLH0032 video amplifier
Television signal amplifier
Decoder for encoded transmissions in Videocrypt and D2MAC
Video amplifier
@ 2010 Make Circuits - More Electronics Schematics.
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