1 Topic by perlguy

  • perlguy
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  • Registered: 2012-09-19
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Topic: Relay question for silicon heat pad

I am attaching a photo of a relay that I have.

I want to put it between a separate 12v supply.

Is there a way to just use the 2 wires that used to go to power the old heating resistor?

I am trying to figure out how to hook this all up.

Thanks!

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2 Reply by ysb

  • ysb
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  • Registered: 2012-08-09
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Re: Relay question for silicon heat pad

mmm... i try to use something like that..

my idea was to use a step-down convertor.. 12v to 5v as the original line of the heater is a on/off 12v... so it will change for a on/off 5v.. then i connect that to this sort of relay which work for arduino command line (5v)

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3 Reply by ronsii

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  • Registered: 2012-10-28
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Re: Relay question for silicon heat pad

perlguy wrote:

I am attaching a photo of a relay that I have.

I want to put it between a separate 12v supply.

Is there a way to just use the 2 wires that used to go to power the old heating resistor?

I am trying to figure out how to hook this all up.

Thanks!

Just use a 7805 regulator from your new 12v supply to power the relay board and then either make a resistor voltage divider from the old resistor wires or another 7805 and current limiting resistor after that, there are lots of different ways to turn a 12v into a 5v signal

4 Reply by heychris

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  • Registered: 2012-11-28
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Re: Relay question for silicon heat pad

When I connected my standard 12V relay to separate the power, the old heater leads caused my relay to flicker back and forth.  I put in a flyback diode and it cleared it up.

http://goo.gl/euBFl

So the end result was a diagram similar to the link above.  The old heated resistor leads now trigger the relay with the flyback diode.  That trigger allows a second power supply to trigger the relay.  I did have to go into the firmware and make sure it was bang-bang insead of PID