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.

DiscoverCircuits.com -- Hobby Corner
Last Updated on: Tuesday, June 01, 2021 03:06 PM

Hobby Circuits List

The contents & graphics of Discovercircuits.com are copyright protected.
LINK to Dave's circuit, but DO NOT COPY any files to your WEB SITE server


More  Tester Circuits


Solar Insulation Meter (June 1, 2017)
designed by David A. Johnson, P.E.

You donít need a fancy and expensive meter to measure the sunís intensity.  With some inexpensive parts you can build your own meter.  I used a 1ma meter movement and a single solar cell I got on eBay with an area of about one square inch.  I calibrated the meter on a very clear bright summer day when the sun was directly overhead.  I pointed the solar cell for the maximum deflection on the meter and then adjusted the 100 ohm variable resistor R2 for a full scale reading. 

The meter is great for spot checking expected sun power at specific roof angles, times of the day and even overcast conditions.  I was amazed when I expected a low power reading on a cloudy day but measured about 60% intensity.  I have also shown below the circuit needed for a typical 100uA meter movement.

Click on Circuit Below to view PDF of Schematic


Hobby Circuits List
eMail David A. Johnson, P.E. about this circuit


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.