Circuit - Hobby Corner Circuits

DiscoverCircuits.com -- Hobby Corner
"Hobby Circuits for your Hobby Projects"

Last Updated on: 06/19/2009 02:36:16 PM

I have compiled a number of circuits, projects and ideas for you, which I think will fall into a general “hobby” category. See Introduction to the Hobby Corner for the philosophy behind creating the Hobby Corner. 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
0.5V Negative Supply
1 Amp Current Injector
1 Line Telephone Line Status Indicator
12v Light/Dark Lamp Switch NEW
12KV High Voltage Generator
12v Lamp Current Indicator
1.5V LED FLASHER Version A
1.5V Touch Activated Switch
2 Button Motor Controller	Ideal Diode Function NEW
2 Line Telephone Line Status Indicator NEW	Infrared Remote Extender
2.45GHz RF Signal Detector	Infrared Safety Switch NEW
24V DC Powered Beeper with 4 Separate Inputs	Isolated Power Supply for Digital Panel Meters NEW
3v Low Battery Voltage Flasher	Light Intensity Monitor
3V Sweeping Siren Alarm	Light to Frequency Converter
40KHz Light Detector with Sunlight Immunity	Low Voltage 120vac Power Line Alarm
6V NiCd/NMH Battery Test Circuit	Machine Vibration Controls Hour Meter
9v Battery Voltage Monitor	Medium Power 12v Brush Motor Speed Controller
9v Powered Xenon Photoflash Controller NEW	Modified LED Night Light
AC Current Indicator Light	Modulated Laser Light Source
AC Current Monitor	Motion Alarm Using Piezoelectric Device
AC Line Powered LED Pilot Light	Moving Air Indicator
AC Powered White LED Strings	NPN-PNP Transistor Tester
Acceptable Voltage Indicator NEW	Ocean Wave Power Generator Demo Unit
Audio Frequency Digital Noise Generator NEW	Piezoelectric Triggered Switch
Audio Signal Detector/Switch	Piezoelectric Vibration Sensor Activates Switch
Automatic DC Motor Brake	Pigeon Scarecrow
Automotive 12v Electrical System Voltage Indicator	Pop Free Microphone Switch
Basement Front Doorbell Beeper	Poor Man’s Digital Counter Using Pedometer NEW
Battery Charging Current Indicator	Poor Man's Timer
Battery Powered Plus-Minus 15v Supply NEW	PWM Circuit for Motor Speed Control
Broken Solar Panels	Power Reminder Beeper
Brownout Voltage Tester	Ramping LED Driver
Candle Power	Reflected Infrared Light Switch
Cheap Close-up Camera Lens	RS-232 Serial Interface Status Indicator
Cheap Electrostatic Discharge Tester	Reduced Power Relay Driver NEW
	Reduced Power Sequential LED Flasher
Cheap Light Power Meter	Run Switching Type AC Power Adapters on DC
Check Engine Beeper	Shadow Activated Motion Detector Circuit
Color Film Negative Makes Visible Light Blocking Filter	Shake to Charge Flashlight
Computer Controlled 100ma Current Source	Simple Security Wire Loop Alarm
Dark Activated 12v Power Supply Switch	Small Battery Capacity Tester NEW
DVD Recorder + TV Camera Make Cheap Data Logger	Solar Cell Test Fixture
Doorknob Alarm	Solar Insolation Monitor
Earthquake Alarm Circuit	RS-232 Serial Interface Status Indicator
Electronics Field Disturbance Monitor	Run Switching Type AC Power Adapters on DC
Fake Car Alarm Light	Universal 3V LED Flasher NEW
Flashing LED Advertising Badge #1	Universal Flasher Using a Latching Relay
Freezer Over-Temperature Alarm	Variable AC Power Supply NEW
Freezing Temperature Alarm	Very Loud Piezoelectric Beeper Circuit
Front Desk Service Beeper	Very Low Voltage Oscillator
Handbook to Optical Through the Air Communications	Watt-Hour Meter
High DC Current Indicator	Wave Power Generator Demo System NEW
High Power LED Flasher NEW	White LED Life Tester
HO Train Model Lighthouse Flasher	Wig/Wag LED Flasher NEW
Honey Bee Counter NEW	Wireless RFID Smart Key Detector
Homemade Corner Cube Reflector Using Glass Mirror Tiles	Worm Harvester
Home Made Geophone Detects Foot Stomp NEW
Human Traffic Footstep Alarm
Human Traffic Footstep Detector NEW

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