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Hobby Circuits designed by Dave Johnson

Last Updated on: Wednesday, November 22, 2017 02:30 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!




Multi-Vibrator Circuits
 
Circuits Designed by David Johnson, P.E. :
Indicates when it is Time to Dust

Indicates when it is Time to Dust

It's Time to Dust Indicator

LED Flashing Badge #1

LED Flashing Badge #2

Low Power H Bridge Motor Controller

Low Power Oscillators

Miniature Pushbutton On/Off Switch

Momentary Touch Activated Switch

On/Off Flip/Flop Circuit with Automatic Timeout

One Shot (D-Flip/Flop) Circuit

Oneshot & Latch Pushbutton

Pulse Period to Voltage Converter

Pushbutton Oneshot & Latch

Slotted Opto-Sensor used in Honeybee Counter

Time to Dust

Timer for Darkroom Camera Shutter

Touch Activated Switch

Turn D-Flip/Flop into a One Shot Circuit

Two Transistor Oscillators

Two-Transistor Low Power Oscillators

Ultra Low Power Astable Multivibrator

Very Low Power Astable Multivibrator
Automatic Timeout included with this On/Off Flip/flop Circuit

Battery-Powered LED Flashing Advertising #2

Capacitance Touch Switch

Delayed Pulse Generator

D-Flip/Flop One Shot Circuit

Flashing LED Advertising Badge #1

Generate Short Delayed Pulse

1 Second One Shot Circuit

1.5V Touch Activated Switch

12v Touch Switch Exciter Circuit

2 Transistor Oscillators

Accurate One Shot Pulse Generator

Advertising Badge #1 with Flashing LED

Advertising Badge #2 with Flashing LED

Astable Ultra Low Power Multivibrator

H Bridge Motor Controller uses Low Power

Honeybee Counter

 

Hobby Circuits by Category

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