Circuits designed by David Johnson, P.E.
Last Updated on: Monday, October 09, 2017 03:38 PM

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More  Constant Current / Current Sink

1 Amp Current Injector Circuit
designed by David A. Johnson

I designed and built this thing many years ago. I published the hobby circuit in the now defunct “Radio Elecronics” magazine back in 1992. The electronic circuit injects a precise 1 Amp of current into any unknown resistor, up to about two ohms. Two alkaline C cells power the complete circuit.
 A voltage booster provides the current control circuit with a higher voltage, to insure the electronic circuit operates properly, even as the battery voltage drops.  A single LED provides both power monitoring and a low battery indicator.  The current source is activated when a pushbutton switch is pressed.
With a good digital voltmeter, you can use this device to measure resistances down to less than one micro ohm. That is 0.000001 ohms. I often use it to measure contact resistance of a relay or the resistance of big chunk of heavy gauge wire or the resistance of a copper trace on a circuit board. You can also use it to measure the voltage drop of a power diode, when conducting one Amp of current.  For more details on this circuit, click here.

Click on Drawing Below to view PDF version of Schematic

Circuit 1 AMP Current Injector designed by David A. Johnson, P.E.

More  Constant Current / Current Sink

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