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Alarms-and-Security

enhanced 5 digit alarm keypad
novel buzzer
alarm control keypad
single zone alarm
personal silent alarm system

Audio Power Amplifier

20 Watt / Channel Stereo Power Amplifier
8 Watt amplifier
Death of Zen (DoZ) – A New Class-A Power Amp
20 Watt Class-A Power Amplifier
50W audio amplifier using ICL8063

Audio preamp circuits

electret mic amplifier.html
Audio preamplifier
RIAA phono amplifier
Microphone amplifier
balanced microphone preamp

Automative car and motorcycle

Electronic auto stethoscope
Car battery charger
Car battery voltage tester using LM3914
wireless auto tachometer
3rd brake light

Data acquisition and data logging

Wireless Weather Station
Wireless Liquid Level Sensing
4 channel data telemetry system
Digital Water Wave/Tide/Level Meter
Serial Port A/D converter

Filter

Multiple Feedback Bandpass Filter
Galaxy Noise Filter
Helical Resonator Notch Filter
Self-tune filter
Butterworth filters

Games and fun stuff

Qix Arcade Game (476k ZIP)
Burger Time Arcade Game (500k ZIP)
Magic Wand Conjuring Trick
Scramble Arcade Game (600k ZIP)
PIC micro Tetris game

Infrared based

Wireless IR headphone transmitter
Build an Infrared night scope
IR Remote Control Extender Circuit (Mark
Infrared link for 10-BASE-T
Stereo IR audio receiver

Laser related power supplies and data transmission

40KHz laser burst detector (PDF)
OPT301 Laser receiver
20MHz VCSEL 3mW laser test circuit (PDF)
Laser transmitter/receiver
HeNe laser power supply

LED related

tw1o Transistor LED Flasher
16 Stage Bi-Directional LED Sequencer
9 Second LED Relay Timer
LED Audio VU Meter
Big 7-segment LED display board with SPI interface

Lighting

5W Fluorescent light intensity modulator (PDF)
Low-voltage light dimmer
Touch Activated Lamp
Microcontroller Multichannel Light Dimmer
Electronic night light

Medical and health

Heartbeat transducer
Electronic Stethoscope
Lie detector
Simple lie detector
Salt taster detects the amount of salt

Microcontroller

PIXpand
PICADC – a free, PIC based "intelligent" A/D converter
90S2313 AVR Robot Board
DS1820 Arbiter V2.00 Schematic
PIC16F84 Serial I/O-expander with PicBasic

Miscellaneous Audio

Code practice oscillator
MS Stereo Decoder
6-Input mixer
MS Stereo Microphone
Base / treble control circuit using LM10

Miscellaneous Schematics

Fogger smoke machine
Simple nitrogen spark generator (PDF)
Low-power optical interrupter (PDF)
Sound finding cricket with phase detector
Morse Code Practice Keyer 2

Model and remote control

Electronic millipede robot
Model rocket launch controller
27Mhz toy car receiver
Launch controller for multiple rockets
Precision Receiver Battery Low Voltage Alarm

Motor and general control

Frequency switch
PWM Motor Speed Controller / DC Light Dimmer
DC Push Button Motor Control Circuit
Assorted relay control circuits
Optically isolated stepper motor controller

Music related schematics

Peak-reading meters
Musical Instrument (Expandable) Graphic Equaliser
Vocal zapper
Apple Mac to MIDI synthesizer interface cable
Amiga MIDI interface

PC related

Ericsson phone to PC serial port interface
iLINK Interface
How to construct Garmin GPS receiver interface cables
PC electrically isolated RS422 interface using SN75176B or MAX485
Using the joystick port as general purpose input

PDA interfaces and related

Hamamatsu UVTron Interface to a BrainStem
Interfacing ADXL202 accelerometer to PalmPilot
Interfacing ultrasonic range finder to BrainStem
Aladin interface
PalmPilot serial port interface

Power supplies and control

Pulse Charger for reviving tired Lead Acid batteries
Variable Voltage and Current Power Supply
Machine power loss beepter (PDF)
Unplugged power cord alarm
Charger for gel lead acid batteries

Radio-frequency

Demodulator Schematic/Design
Smooth Tone Clickless CW Sidetone Generator
Vibrating pocket bug detector
AM receiver for aircraft communications
Regenerative shortw1ave receiver

Solar Powered

AA battery solar charger
Solar Panel Charge Controller / Low Voltage Disconnect Circuit
D1 solar engine
Solar charge controller
Portable solar battery charger

Telephone and intercom

4-line telephone status indicator (PDF)
Phone in-use
Cut telephone line detector
Phone Line to Audio
Telephone amplifier

Test equipment

Mini DDS (direct digital synthesizer)
Capacitance meter
Crystal tester
Frequency and capacitance meter
Full Featured Transistor Tester

Timing oscillators

Budget timer
CMOS oscillator
Countdown timer with relay
D Flip-flot one-shot circuits (PDF)
TV based Receiver for a Standard Frequency Generator

Transmitter RF

Simple RF transmitter
7MHz QRP transmitter
RF/SS Handie Hopper Transmitter Schematic
Tracking transmitter
2 Transistor FM Voice Transmitter

Uncategorized

Musical Instrument (Expandable) Graphic Equalizer
Improved PL tone Decoder
Better Volume Control
Audio Graphic Equalizer
Simple, Easy Parametric & Graphic EQ`s, Plus Peaks & Notches

Video

Video Amplifier #2
Decoder for encoded transmissions in Videocrypt and D2MAC
8 x 8 Audio-video switch
LH0032 video amplifier
Video Clock Superimposer

@ 2010 Make Circuits - More Electronics Schematics.

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