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Help with using transistor as both N.O & N.C Relays
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Author Topic: Help with using transistor as both N.O & N.C Relays  (Read 914 times)
h3rman
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« on: March 31, 2013, 12:36:57 AM »

I made a circuit (the finished circuit is going to have many more "contacts") that is supposed to replace a bunch of relays.

Question no 1 - Does this work for the N.O function?

Question no 2 - How can i make an N.C. function? (I cannot use the 60 VDC as power supply. The N.C function must be working when there is no input voltage, and do to the place where the circuit is going to be i cannot use a separate power line or ground.
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Hero999
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« Reply #1 on: April 02, 2013, 11:07:45 PM »

The NC function generally needs a permanently live powersupply but there are ways round it.

The simplest way is to is to use a depletion mode power MOSFET or a JUGFET driving a BJT being driven by a small pulse transformer.

Another trick involves using a small battery to bias a transistor on and use an opto-coupler to turn it off.
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I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

Please ask on the open forum if you have a question: if I know the answer, I'll be happy to help.

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