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Last Updated on: Sunday, December 31, 2017 08:07 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.

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Sink to Source Universal DC Converter designed by Dave Johnson

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