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Starting the cabinet all at once. It works! And here's how...

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Popcorrin:
Peale I was looking to do the same thing you are.  I get the jist of what rsoandrew is suggesting but I don't see how you can operate the relay off one of the leads of the power supply.  The way I understand it there is no juice to the leads off of the power supply until you release the power button, not when the button is actually depressed.  

rsoandrew:
Popcorrin-It's kind of confusing (and I'm still only 98% sure that it would work because of timing issues) but a relay that is normally closed doesn

Popcorrin:
I understand what you are saying and how a relay works.  The only thing I was questioning and I may be mistaken on this is that the power on the computer doesn't become active when you press the power button but rather after you release it.
You close the circuit and then open it.  Once it opens the power comes on.  If I am correct (which is not a sure thing)  the relay will not open because it needs power and to get power it needs to open.   It won't be hard to test and you may already have.

SirPeale:
I'll have to consult my EE friend about this.

rsoandrew:

--- Quote from: Popcorrin on May 20, 2004, 04:04:37 pm ---I understand what you are saying and how a relay works.  The only thing I was questioning and I may be mistaken on this is that the power on the computer doesn't become active when you press the power button but rather after you release it.
You close the circuit and then open it.  Once it opens the power comes on.  If I am correct (which is not a sure thing)  the relay will not open because it needs power and to get power it needs to open.   It won't be hard to test and you may already have.

--- End quote ---

You are correct. I didn't really consider that possibility.

I just simulated this on my home PC (unplugged it and then held the on button while plugging it back in) The PC did not power up until I RELEASED the button. So in order for this to work the relay would have to be connected to the 110v system and couldn't be connected to the pc power supply.

It still might work with a normally closed relay but you'll have to do some experimenting. I would be afraid that it wouldn't stay closed long enough - but it might.

Of course since I was wrong on my other theory, you may not want to listen to me at all. I sure sounded good though.

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