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Hobby Circuits designed by Dave Johnson

Last Updated on: Tuesday, June 01, 2021 03:22 PM

List of Hobby Circuit Designs

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

Signal Generation Circuits
Circuits designed by David Johnson, P.E. :

Gated 125Khz Oscillator

Gated Crystal Oscillator with Very Low Power

Generate Short Delayed Pulse

Highly Stable Lower Power Oscillator

It's Time to Dust Indicator

LC Oscillator Medium Power 125Khz

LED Test Signal Generator-40Khz

Light to Frequency Converter

Measure Button Battery Cell's Internal Resistance 

Miniature Pushbutton On/Off Switch

Motorized Duck Decoy Timer

Oneshot & Latch Pushbutton

Oscillator Draws 2 Nanoamps

Oscillator with Ultra Low Current

Over-Temperature Micro-Power Alarm

Parallel LC Oscillator with CMOS Inverter 

Slotted Opto-Sensor used in Honeybee Counter

Time to Dust

Timer for Darkroom Camera Shutter

Triangle Signal Generator

Turn D-Flip/Flop into a One Shot Circuit

Ultra Low Power 32Khz Crystal Oscillator

VCO from CMOS Schmitt Trigger IC

Version 4 of a Ultra Low Current Oscillator

Very Low Voltage Oscillator Circuit

1 Second One Shot Circuit

100Khz Low Power Light Receiver

125KHZ Medium Power Oscillator

125khz Oscillator with Medium Power

125Khz Ultra Pure Sine Wave Signal Source

40Khz Burst Laser Diode Driver

40Khz Precision Triangle Generator

Astable Multivibrator with Very Low Power

Astable Ultra Low Power Multivibrator

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

Battery-Powered LED Flashing Advertising #2

Cheap Low Power 3v 2hz Oscillator

CMOS Inverter forms a Resonant LD Oscillator 

CMOS Inverters Form 125Khz Oscillator

CMOS Oscillator, Draws Only 0.5ua

ELC signal between 200Mhz-400Mhz

Flashing LED Advertising Badge #1

Flexible Outputs from Square Wave Driver


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Dave's Circuits

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