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Hobby Circuits designed by Dave Johnson

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

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Field-Effect Transistor (FET) Circuits
Circuits designed by David Johnson, P.E. :

FETs & Logic Devices Divides Supply Voltage on Charge Pump Efficiently 

Form Push-Pull Driver using N-Ch & P-Ch Transistors 

High Impedance JFET Buffers

High Speed Light Detector from FET Input


Peak to Peak 300v Signal Generator

Protects from Battery Polarity Reversal

Solid State Touch Activated Switch

Universal DC Sink to Source Converter

AC/DC relay from Charge Coupled MOSFET

Astable Multivibrator with Very Low Power

Bi-Directional Charge Coupled Powers MOSFET Relay

Characteristics of CMOS Logic Inverter Amplifiers


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 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.