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 03:06 PM

List of Hobby Circuit Designs

Text & Graphics Copyright © David A. Johnson, P. E. -- ALL Rights Reserved.
LINK to Dave's circuit, but DO NOT COPY to your WEB SITE server!

Light Sensor Circuits
 

12 Volt Lite/Dark Lamp Switch

12kv High Voltage Generator

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

1Khz to Over 70Mhz Light Receiver

1us Light Pulse Receiver

1W White LED Night Light

24 Volt Day Night Switch

24v NiMH Battery Charger using a 12v Solar Panel 

2Mhz Broad Band Optical Fiber Receiver

3mw Laser Test-20Mhz VCSEL

40Khz Burst Laser Diode Driver

40KHz Light Detector with Sunlight Immunity

Ambient Light Dectector with Compensation

Broad Band 50Mhz Optical Fiber Receiver Version A

Broken Solar Panels

Capacitance Touch Switch

Cell Phone Solar Powered Charger

Dark Activated 12v Power Supply Switch

Detect Clear Fluid

Detect Short Xenon Lamp Flashes

Detects Xenon Lamp Flash

Fully Isolated 50/60hz Sync Generator

High Ambient Light Immunity with a 40Khz Light Detector

High Speed Light Detector from FET Input

Ideal Diode for PV Panels

Ideal Diode Function

Improve Response Time of a Photo Transistor Circuit

Improved Solar Path Light

Infrared Remote Extender Circuit

Insolution_Meter_Solar

It's Time to Dust Indicator

Laser Burst Light Detector

Laser Light Detyector-10Mhz to 20Mhz

Latching_Relay_Dusk_To_Dawn

LED/Laser Light Output Intensity Meter

Light Detector

Light Intensity Monitor

Light Monitor Circuit

Light Pulse Receiver (2uS)

Light Receiver 30Khz Amp

Light Receiver Front-End Circuit

Light Receiver-10MHz to 20MHz

Light to Frequency Converter

Modified LED Night Light

Modulated Light Receiver Front-End Circuit

Modulated Light Receiver uses a Single IC

One-Watt White LED Night Light

Operation of Cascode Light Receivers

Optical Fiber Receiver-5Mhz Broad Band

Optical Filter using Color Film Negative

Photovoltaic Solar Panels-Ideal Blocking Diode Circuit

PV Solar Cell Test Fixture

PV Solar Panels-Ideal Blocking Diode Circuit

RFID Test Circuit

Safety Light

Salvaged Broken Solar Cells

Shop Safety Light

Slotted Opto-Sensor used in Honeybee Counter

Slotted-Type Optical Interrupter Draws Microamps

Snow Depth Alarm

Solar Cell Test Fixture

Solar Insulation Monitor

Solar Powered Lithium Ion Battery Charger

Tester for Modulated Light

Time to Dust

Transmitter for Line Powered Xenon Flash

TV-VCR Light Source 40Khz Repeater

Ultra Low Power Detects Clear Fluid

Use Color Film Negative to Make an Optical Filter

Water Pump controlled by Solar Power

Xenon Flash Receiver-Pg2
 

Hobby Circuits by Category

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.