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Alarms-and-Security

active ir motion detector
water level alarm
Door knob alarm
single zone alarm
Low power RFID transponder

Audio Power Amplifier

Linear FM 50 watt amplifier with BLY90
Amplified ear for surveillance
Audio amplifier output relay delay
20 Watt Class-A Power Amplifier
16 Watt amplifier

Audio preamp circuits

Microphone amplifier
masthead preamp
balanced microphone preamp
Audio preamplifier
RIAA phono amplifier

Automative car and motorcycle

Automatic headlight brightness switch
speed alert wireless portable unit
Turn signal alarm
Car battery voltage tester using LM3914
3rd brake light

Data acquisition and data logging

Wireless Weather Station
Electronic altimeter using PIC16F877
Serial Port A/D converter
Magnetometer
Strain gauge sensor

Filter

Butterworth filters
Galaxy Noise Filter
29.85 MHZ bandpass filter schematic
Active bandpass filters
Inversal notch and bandpass filter

Games and fun stuff

Lego Mindstorms Double Rotation Sensor
E.S.P. Conjuring Trick
Flashing Heart
Furby reverse-engineered circuit
GameBoy Power & Cartridge schematic

Infrared based

Pyroelectric Infrared Sensor
IR remote control extender
IR detector
Simple infra-red detector
IR Remote Control Extender Circuit (Mark

Laser related power supplies and data transmission

Simple laser communicator
Laser transmitter schematics
OPT301 Laser receiver
10MHz to 20MHz laser light detector (PDF)
Laser diode transmitter

LED related

3V LED chaser using 4017
LED pulser with audible output
LED Mood Light
Flashing LED advertising badge -2 (PDF)
9 Second LED Relay Timer

Lighting

Sequencing Neons (NE-51 / NE-2)
5W Fluorescent light intensity modulator (PDF)
LX-800 Lighting system
Digitally Addressable DALI Dimming Ballast (PDF)
6 Channel Auto Reverse Sequential Disco Running Lights

Medical and health

Brain Wave Machine
Salt taster detects the amount of salt
Heartbeat transducer
Simple lie detector
Muscular Bio stimulator

Microcontroller

PIC16F873 ultrasonic range meter
Connecting LED to PIC Micro I/O pins (PDF)
Atmel AVR and 8051 series ISP programmer
PIC micro multiple servo motor interface
PIC16F877 Programmer And Development System

Miscellaneous Audio

Paradoxical Sound Syntheizer
Dual Voltage Controlled Oscillator w/Modulator
Loudspeaker Protection and Muting
Analog VU meter
Magnetic cartridge amplifier

Miscellaneous Schematics

Bleeper box for time reference
Smooth Tone Clickless CW Sidetone Generator
Circuit for gold wafer card
Seismic detector interfaces to datalogger
Very basic circuits

Model and remote control

27Mhz toy car receiver
tw1o tone train horn
Precision Receiver Battery Low Voltage Alarm
Signal breaking module
Pad launch controller for model rockets

Motor and general control

555 Timer Monostable Circuit Using Pushbutton
Assorted relay control circuits
Gasoline generator automatic throttle controller
35KHz Magnetic Radiation Remote Control
Simple 10 Stage Control Box

Music related schematics

Microcontroller MIDI interface
Simple line mixer
Miniature metronome
Wave Multiplier for music synthesizers
Octave screamer

PC related

Compter microphone
160 Baud ALDL Hardware Interface
PC interface for point controller
Commodore 64 24-bit parallel port interface with 8255
Apple II/II+/IIe IDE Drive Interface

PDA interfaces and related

Aladin interface using op-amp
Casio interface cable
Interfacing ADXL202 accelerometer to PalmPilot
Wireless local netw1ork for PalmPilot (large PDF)
Hamamatsu UVTron Interface to a BrainStem

Power supplies and control

Unplugged power cord alarm
Nagative voltage generation using 555 timer
Voltage converter
Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VAC
Simple +5V power supply circuit

Radio-frequency

Superregenerative 27MHz receiver
Huge LED Antenna Direction Display (part 2)
One transistor FM receiver
136 kHz direct conversion receiver
TRF AM Receiver circuit

Solar Powered

Solar robots
Solar charge controller
Solar Charged LED Flashlight
Zener-based solar engine
PM1 solar engine

Telephone and intercom

Assorted telephone circuits
Telephone amplifier
Telephone in use light
Talking phone dial monitor
Telephone Line Monitor

Test equipment

Latching continuity tester using 4093
Crystal tester
Capacitance meter
Self Oscillating Amplifier for Distortion Testing
220V live wire-in-wall scanner

Timing oscillators

TV based Receiver for a Standard Frequency Generator
Stable 40KHz clock
`Rounding Off` a square wave
Line powered 60Hz clock generator (PDF)
Crystal oscillator

Transmitter RF

FM transmitter bug
Miniature FM transmitter
5W PLL Transmitter
AM transmitter
7MHz QRP transmitter

Uncategorized

Soft Switching Amplifier With Tone Controls
Digital Delay Unit for Surround Sound
Musical Instrument (Expandable) Graphic Equalizer
Audio Graphic Equalizer
Better Volume Control

Video

Television signal amplifier
Macrovision removal
Video Amplifier #2
8 x 8 Audio-video switch
PIC micro frame grabber (TDA8708)

@ 2010 Make Circuits - More Electronics Schematics.

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