Hobby Corner Circuits

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DiscoverCircuits.com -- Hobby Corner
Last Updated on: 03/19/2008 06:54:11 AM

Hobby Corner -- Introduction to the Hobby Corner
Circuits designed by David A. Johnson, P.E.
Last Updated on: 03/04/2008 07:02:03 AM

I have compiled a number of circuits, projects and ideas for you, which I think will fall into a general “hobby” category. For those who frequent this site, some of the material will look familiar as I borrowed some of it from the DC forum. Plans for the future are to pull together interesting links to hobby circuits from around the world. The emphasis will be for projects that perform some useful function. Please feel free to make suggestions.

0.5v to 6v Voltage Converter
1 Amp Current Injector
12KV High Voltage Generator
1.5V LED FLASHER Version A
2 Button Motor Controller
2.45GHz RF Signal Detector
24V DC Powered Beeper with 4 Separate Inputs
3v Low Battery Voltage Flasher
40KHz Light Detector with Sunlight Immunity
9v Battery Voltage Monitor
AC Current Indicator Light	Light to Frequency Converter
AC Current Monitor	Machine Vibration Controls Hour Meter
AC Powered White LED Strings	Modified LED Night Light
Audio Signal Detector/Switch	Modulated Laser Light Source
Automatic DC Motor Brake	Moving Air Indicator
Automotive 12v Electrical System Voltage Indicator	NPN-PNP Transistor Tester
Basement Front Doorbell Beeper	Ocean Wave Power Generator Demo Unit
Battery Charging Current Indicator	Pigeon Scarecrow
Broken Solar Panels	Pop Free Microphone Switch
Brownout Voltage Tester	PWM Circuit for Motor Speed Control
Candle Power	Power Reminder Beeper
Cheap Close-up Camera Lens	Reflected Infrared Light Switch
Cheap Electrostatic Discharge Tester	RS-232 Serial Interface Status Indicator
Cheap Light Power Meter	Run Switching Type AC Power Adapters on DC
Check Engine Beeper	Simple Security Wire Loop Alarm
Color Film Negative Makes Visible Light Blocking Filter	Shadow Activated Motion Detector Circuit
DVD Recorder + TV Camera Make Cheap Data Logger	Shake to Charge Flashlight
Doorknob Alarm	Solar Cell Test Fixture
Earthquake Alarm Circuit	Solar Insulation Monitor
Electronics Field Disturbance Monitor	Solar Powered Lithium Ion Battery Charger
Flashing LED Advertising Badge #1	Solid State Relay Requires Ultra Low Control Current
Freezer Over-Temperature Alarm	Ten Turn Pot Forms Frequency Readout
Freezing Temperature Alarm NEW	Two 12v Battery Isolator
Handbook to Optical Through the Air Communications	Universal Flasher Using a Latching Relay
High DC Current Indicator	Very Loud Piezoelectric Beeper Circuit
HO Train Model Lighthouse Flasher	Very Low Voltage Oscillator
Freezing Temperature Alarm	Watt-Hour Meter
Front Desk Service Beeper	White LED Life Tester
Homemade Corner Cube Reflector Using Glass Mirror Tiles	Wireless RFID Smart Key Detector
Infrared Remote Extender	Worm Harvester
Light Intensity Monitor

250 Science Fair Projects

Hobby Circuits in Progress - List of ideas on Dave's workbench.

Suggested Tool Kit List NEW

Links to other Hobby Circuits