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Hobby Circuits designed by Dave Johnson

Last Updated on: Wednesday, June 02, 2021 04:01 AM

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!

Voltage Regulator Circuits
Circuits designed by David Johnson, P.E. :

Circuit Eliminates 9v Battery

Generate 0.5v Negative Supply

High DC Current Indicator

Laptop Power Supply

Light to Frequency Converter

LM317 adjustable voltage regulator used in Battery Eliminator Circuit

Miniature Pushbutton On/Off Switch

Negative 0.5 Volt Supply

RS-232 Serial Interface Status Indicator Circuit

Servo Pulse to Voltage Converter

Simple Circuit Negative Supply Circuit

Touch Switch 240VAC

Voltage Boost

Voltage Boost to Series Regulator provided by Capacitor

0.5v to 6v Voltage Converter

0VAC to 280VAC Variable Isolated AC Voltage

12v-24v AC & DC Day/Night Switch

5+V Classic Linear Supply using 6.3VAC Transformer

AC to DC (240v to 5v)Power Supply

Battery Powered Plus-Minus 15v Supply

Capacitance-Based Touch Switch


Hobby Circuits by Category

Dave's Circuits

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

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