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Switch a negative powersupply?

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jgeens

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I have a question:
I want to switch a negative powersupply (on and off).
I have a controller (open drain,pull-up outputs).

This was my idea: (I wont work because the current cant flow through the fet)

**broken link removed**
 

While switching negative power with N-Channel MOSFET it's better idea to use optocoupler .. see attached picture ..

More on this issue you can find here:
**broken link removed**

Rgds,
IanP
 

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