Circuit - Hobby Corner Circuits

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

Last Updated on: 12/31/2008 02:47:38 AM

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

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