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

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

HOME Schematics Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches
Welcome to DiscoverCircuits.com - online since 2002

See Media Kit for
Advertising Opportunities

Attention Designers:  Please alert us by eMail if we have linked to sites
where your original material has been copied without your permission.
We will change to the LINK to your site.  
Thank you.


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!

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

CMOS Inverters Form 125Khz Oscillator

CMOS Nand Gate Forms Gated 125Khz Oscillator

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

High Power Touch Switch Exciter Circuit

Laptop Power Supply

LC Oscillator Medium Power 125Khz

Medium Power 125khz Oscillator

Medium Power 125khz Oscillator #2

Micro Power Over-Temperature Alarm

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

Square Wave Driver Has Flexible Outputs

Touch Switch Exciter

Ultra Low Power Human Finger Detector

Ultra Pure 125kHz Sine Wave Signal Source

Very Low Power Astable Multivibrator

Very Low Power Gated Crystal Oscillator

Voltage Boost to Series Regulator provided by Capacitor

Voltage Converters-0.5 to 6 Volts
+5v Powered Charge Pump Battery Charger

0.5v Negative Supply

0.5v to 6v Voltage Converter

1 Watt Fluorescent Lamp Night Light

125Khz LC Oscillator

125KHZ Medium Power Oscillator

125Khz Oscillator from CMOS Inverters

125khz Oscillator with Medium Power

125Khz Ultra Pure Sine Wave Signal Source

12v to 19v Laptop Power Supply (Concept)

12v Touch Switch Exciter Circuit

200Mhz-400Mhz Voltage Controlled Oscillator (VCO)

24v NiMH
Battery Charger using a 12v Solar Panel 

300v Peak to Peak Signal Generator

5+V Classic Linear Supply using 6.3VAC Transformer

50/60Hz Sync Generator-Fully Isolated

Astable Multivibrator with Very Low Power

Audio Frequency Digital Noise Generator

Battery Powered Plus-Minus 15v Supply

Caps Provide Voltage Boost to Series Regulator

Charge Pump Battery Charger-+5 Volts

Charge Pump Efficiently Divides Supply Voltage 

Classic Linear 5v Supply using 6.3vAC Transformer

CMOS Inverter 125khz LC Oscillator

CMOS Inverter forms a Resonant LD Oscillator 


Hobby Circuits by Category

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



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

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

Discovercircuits.com endeavors to credit original designers.   Please alert us by eMail so we can
delete links to material that have been copied without your permission
.   Thank you.

Copyright of all original material on this website is the property
of David A. Johnson, P.E. (Dave Johnson & Associates ) unless otherwise noted.  

Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.
All material is provided "as is" without guarantees or warranty of any kind, either expressed or implied.