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: Tuesday, June 01, 2021 03:22 PM

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!

DC to DC Power Supply Circuits
Circuits designed by David Johnson, P.E. :

Digital noise generator

ELC signal between 200Mhz-400Mhz

Exciter Circuit-12v Touch Switch

FETs & Logic Devices Divides Supply Voltage on Charge Pump Efficiently 

Flexible Outputs from Square Wave Driver

Fluorescent Lamp Night Light Needs Only 1 Watt

Fully Isolated 50/60hz Sync Generator

Gated 125Khz Oscillator

Gated Crystal Oscillator with Very Low Power

Generate 0.5v Negative Supply

Laptop Power Supply

LC Oscillator Medium Power 125Khz

Negative 0.5 Volt Supply

Over-Temperature Micro-Power Alarm

Peak to Peak 300v Signal Generator

RS-232 Serial Interface Status Indicator Circuit

Simple Circuit Negative Supply Circuit

Touch Switch Exciter

Voltage Boost to Series Regulator provided by Capacitor

0.5v to 6v Voltage Converter

125KHZ Medium Power Oscillator

125khz Oscillator with Medium Power

125Khz Ultra Pure Sine Wave Signal Source

24v NiMH Battery Charger using a 12v Solar Panel 

5+V Classic Linear Supply using 6.3VAC Transformer

Astable Multivibrator with Very Low Power

Battery Powered Plus-Minus 15v Supply

Charge Pump Battery Charger-+5 Volts

CMOS Inverter forms a Resonant LD Oscillator 

CMOS Inverters Form 125Khz Oscillator


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.