Turning a “switch” off when voltage present

[Vishnu R]

For a project I'm working on, I want to be able to turn a "switch" (eg, a transistor) off when a voltage is present in another part of the circuit.

 

Is there a way of doing this?

 

TIA,

Kevin

SOLVED: Problem solved: nand gate (Can’t post a reply with my phone)

[Ashutosh Bhatt]

ok congrets

but I didnt get you exactly!

what was your problem? what you were trying to do? and what you get as solution?

[Author]

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