|
|
|
 |
DiscoverCircuits.com, has
26,000+ electronic circuits or schematics
cross-referenced into 500+ categories. As a
vital resource for engineers, hobbyists, inventors &
consultants, the site's collection of information will
help you find quick solutions to electronic design
problems. |
|
|
|
|
|
|
|
|
|
DiscoverCircuits.com
-- Hobby Corner
Last Updated on:
03/19/2008 06:54:11 AM |
|
|
|
|
High DC Current Indicator
designed by David A. Johnson, P.E. |
|
A while back, someone requested a simple method to indicate when 20 to 50 amps of DC current was flowing through a wire. The circuit below
works well and is about as simple as you can get. A sensitive reed relay from www.Jameco.com
acts as the current sensor. The magnetic field produced by such a current is enough to close the relay contacts, if one or two turns are wound around the relay. The turns do not have to be
tight. I was able to close the contacts with two turns about 2 inches in diameter with 20 amps. A simple LED and resistor can be used to indicate the current by tapping into the automotive
+12v supply. |
 |
 |
 |
|
|
