Using a momentary switch for main power switch? - diyAudio
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Old 25th June 2002, 12:25 PM   #1
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Wink Using a momentary switch for main power switch?

Hi guys,

I'm in the process of rebuilding my pre/power amps so the enclosures are a bit less 'Ghetto'

I have aquired a vandel proof switch with a built in LED which looks identical to the switch on the front of the Pass X1000 , the only problem is that it's momentary and has rather weedy ratings.

My question is this, how/where could I find a circuit to use this as a method of switching the main power on and off? My ideal solution would be to have the preamp on all the time, but have the momentary switch activating some 12v feeds on the back of the preamp, so I could turn those thirsty Zen's on and off remotely (they are in another room). A time delay would be nice too, as four channels worth of SOZ take quite a bit of inrush juice


Thanks
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Old 25th June 2002, 12:45 PM   #2
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bumperty bump bump
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Old 25th June 2002, 12:52 PM   #3
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i've got a circuit that will do just that .... i'll post it in a few hours time as soon as i find where i've got it stored.
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Old 25th June 2002, 02:02 PM   #4
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tnx m8ey

am I right in thinking there will be some logic involved?
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Old 25th June 2002, 02:44 PM   #5
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You shouldn't need logic to do what you want. A handful of relays and possibly some timed relays as well should do what you want. We'll see what Audiofreak has. He is pretty good with this stuff and won't steer you wrong.
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Old 25th June 2002, 02:55 PM   #6
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Well, just have a look here. One overkill solution (mine ) and one simple. Makes a good starting point.

Hope this helps
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Old 25th June 2002, 04:13 PM   #7
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Thanks alot ftorres, thats almost exactly what I was thinking of (idea, not schematic )
Do you have to hold down the switch to turn it on/off, or do you just touch it? Additionally, does that give a 12v pulse or constant 12v.
Thanks again doods, I'll wait to see what AudioFreak comes up with before I build anything.
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Old 25th June 2002, 04:21 PM   #8
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Just push the switch and release it. It produces a clock pulse that toggles the flipflop. 12V is not mandatory, just use above 3V and below 18V (for CMOS), and match your relay voltage to supply's. Pulse is available at the ff's clock input, and a constant level at the drain of the mosfet.

Hop, this helps
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Old 25th June 2002, 05:43 PM   #9
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Sorry but i'm going to have to hit the sack.... i've fallen ill and I'm not up to doing this right now .... i'll post my solution in the morning... this is just going to have to wait i'm afraid.

As for logic, you can do it with just a few transistors a bunch of caps and resistors plus a few relays... i prefer to make the 'timer' myself rather than using a timed relay. Of course you can also do it with a couple of logic chips and indeed this is the way that it is done in all the computers, quick, cheap, stable, reliable it is but versatile it is not .... i'll leave you to work out which solution I prefer and yes it uses transistors
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Old 25th June 2002, 08:23 PM   #10
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NP AF, I look forward to seing what you come up with
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