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Circuits designed by David Johnson, P.E.
Last Updated on: Wednesday, October 18, 2017 05:04 AM

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More Switches, FET circuits

 

Sink to Source Universal DC Converter

As illustrated below, many control systems use an open collector transistor to turn something on.  Perhaps it is a LED light, a relay or a small motor.  However there are other  systems which require a common ground connection instead of a common V+ supply connection.

The circuit below converts the "sink to ground" current path to a "supply source" power connection.  With the components shown, the circuit will operate over a wind 3v to 28v range with a current up to 1 Amp.

Text & Graphics Copyright of David A. Johnson, PEAll rights reserved, NO EXCEPTIONS!

Click on Drawing Below to view PDF version of Schematic

Sink to Source Universal DC Converter designed by Dave Johnson

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