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More Switches, FET circuits

Universal DC Sink to Source 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.

Click on Drawing Below to view PDF version of Schematic

universal DC Sink to Source converter designed by David A. Johnson



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