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Hobby Circuits designed by Dave Johnson

Last Updated on: Tuesday, October 24, 2017 03:04 PM

List of Dave's Circuit Designs

Text & Graphics Copyright David A. Johnson, PE  --  ALL Rights Reserved.
LINKING to Dave's circuits is permitted but DO NOT COPY CONTENT to your WEB SITE server!




Timer / Counter Circuits
Circuits Designed by David Johnson, P.E. :

Digital Counter using Pedometer

Divide a TTL Clock Signal by 1.5

Divide By 1.5 Counter

Dusk To Dawn Latching Relay

Front Desk Service Beeper

Garage Door Timer

Laser Used as Vehicular Traffic Counter

Latching_Relay_Dusk_To_Dawn

Line Powered 60hz Clock Generator

Long Period Computer Watch Dog Timer

Low Power Oscillators

Motorized Duck Decoy Timer

On/Off Flip/Flop Circuit with Automatic Timeout

On/Off Latch Circuit with 2 Second Delay

On/off Pushbutton Switch with 30 Minute Timeout

Poor Man's Timer

Press & Hold Latching Circuit

Pushbutton Activates Service Request Beeper

PWM Motor Controller uses a 555 Timer

Service Request Beeper

Three-Minute Closet Light

Timer for Darkroom Camera Shutter

Two Transistor Oscillators

Two-Transistor Low Power Oscillators

Watchdog Timer set for 36 Hrs

2 Transistor Oscillators

3 Minute LED Closet Light

36-Hour Watchdog Timer

3-Minute Closet Light

3-Minute Closet Light #2

555 Timer Forms Simple Circuit PWM Motor Controller

60hz Clock Generator is Line Powered

Accurate One Shot Pulse Generator

Automatic Timeout included with this On/Off Flip/flop Circuit

Call-for-Service Beeper

Camera Shutter Time Measurement

Chicken Coop Door Opener with Timer

Circuit Forms Divide By 1.5 Counter

Closet Light with Automatic 3-Minute Timeout

Computer, Long Period, Watch Dog Timer

Count Cars with Laser

Darkroom Camera Shutter Timer

 

Hobby Circuits by Category

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  David A. Johnson, P.E. about these circuits

 

 


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