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Hobby Circuits designed by Dave Johnson

Last Updated on: Tuesday, October 24, 2017 03:04 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!

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

Circuit Eliminates 9v Battery

Classic Linear 5v Supply using 6.3vAC Transformer

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

Nine-Volt Battery Eliminator

RS-232 Serial Interface Status Indicator Circuit

Servo Pulse to Voltage Converter

Simple Circuit Negative Supply Circuit

Touch Switch 240VAC

Ultra Low Power Human Finger Detector

Variable Isolated AC Voltage Spans 0VAC to 280Vac

Voltage Boost

Voltage Boost to Series Regulator provided by Capacitor

Voltage Converters-0.5 to 6 Volts
0.5v to 6v Voltage Converter

0VAC to 280VAC Variable Isolated AC Voltage

12v to 19v Laptop Power Supply (Concept)

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

240VAC to 5VDC Power Supply

5+V Classic Linear Supply using 6.3VAC Transformer

9v Battery Eliminator

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

Battery Eliminator

Battery Powered Plus-Minus 15v Supply

Capacitance-Based Touch Switch

Caps Provide Voltage Boost to Series Regulator


Hobby Circuits by Category

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


Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

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