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Hobby Circuits designed by Dave Johnson

Last Updated on: Tuesday, June 01, 2021 03:06 PM

List of Hobby Circuit Designs

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

   

Oscillator Circuits

ELC signal between 200Mhz-400Mhz

Flexible Outputs from Square Wave Driver

Gated 125Khz Oscillator

Gated Crystal Oscillator with Very Low Power

Highly Stable Lower Power Oscillator

Inductive Pulse Receiver (175Khz)

LC Oscillator Medium Power 125Khz

LED Test Signal Generator-40Khz

Light to Frequency Converter

Measure Button Battery Cell's Internal Resistance 

Oscillator Draws 2 Nanoamps

Oscillator with Ultra Low Current

Over-Temperature Micro-Power Alarm

Parallel LC Oscillator with CMOS Inverter 

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

 

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

Astable Multivibrator with Very Low Power

Astable Ultra Low Power Multivibrator

Cheap Low Power 3v 2hz Oscillator

CMOS Inverter forms a Resonant LD Oscillator 

CMOS Inverters Form 125Khz Oscillator

CMOS Oscillator, Draws Only 0.5ua

 

 
 

Hobby Circuits by Category

Dave's Circuits

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



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