Question about a relay inverter

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Paulos91

Joined Jul 8, 2023
9
Hi guys
Im needing some help,

I'm running a hot water pump from a little 0-12v power transformer and 12v relay; the circuit looks like this:

As you can see the transformer is a single winding type (not centre-tapped)

What I want to do is, use this same transformer and in place of the relay (which has a finite life) use two transistors (2n3055) with resistors, but I dont know how to wire it up. If you can give any help, maybe a circuit diagram it'll be really appreciated. thanks. Paul.
 

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crutschow

Joined Mar 14, 2008
33,370
You can't readily use those transistors to switch AC voltage.
Two MOSFETs can be configured to do that.

How much current does the pump take?
What controls the relay?
Does the control ground need to be isolated from the transformer AC output?
 

Thread Starter

Paulos91

Joined Jul 8, 2023
9
You can't readily use those transistors to switch AC voltage.
Two MOSFETs can be configured to do that.

How much current does the pump take?
100mA
What controls the relay?
Just the wiring to the battery (it flip flops from 0-12v)

Does the control ground need to be isolated from the transformer AC output?
I'm not sure-will have a think about that..
Thanks for help
 

Thread Starter

Paulos91

Joined Jul 8, 2023
9
You can't readily use those transistors to switch AC voltage.
I was thinking to use them in Astable multivibrator mode and wire outputs to the the little transformer.. was my thinking
 
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