Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 45,000+ electronic circuits, cross-referenced into 500+ categories.
We have searched the web to help you find quick solutions & design ideas.

Got Designs?
Please eMail
if you want me to link to and/or post your original design
NOTE:  We make every effort to link to original material posted by the designer. 
Please contact us if our link is not to your site!  Thanks.

Hobby Circuits designed by Dave Johnson

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

Text & Graphics Copyright David A. Johnson, PE  --  ALL Rights Reserved.
LINKING to Dave's circuits is permitted but COPYING CONTENT to your WEB SITE server IS NOT!

Voltage Converters (Transimpedance) Circuits

Circuits designed by David Johnson, P.E. :

Capacitance-Based Touch Switch

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

0.5v to 6v Voltage Converter

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


Hobby Circuits by Category

Dave's Circuits

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

HOME Schematics Index Hobby Corner Dave's Circuits Contact Info
Imagineering Ezine Dave Johnson & Associates Faraday Touch Switches

 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy

Copyright  January, 1998 - June, 2021     David A. Johnson  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.