ANSWERED A point to tap into for power based on DemoNs power state

oblivioncth

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Apr 13, 2012
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I am really hoping someone can help me with this and a feel bad because I PMed a staff member and asked something similar in another forum, but I and too unsure and don't want to try anything on my own yet because I don't want to damage my DemoN.

What I need to do is really simply. I want to install a relay into the console that turns on when the DemoN is on, and turns off when the DemoN is off. In order to do this I simply need to draw power from something DemoN related (DemoN, its daughterboard, the ribbon cable, etc.) and know what voltage that power is (so that I know what relay to get), but I can just measure that with a multimeter. So does anyone know a safe place on the DemoN to take power from (obviously a point that doesn't provide power in standby, while the DemoN is off)? I only needs to be enough to power a relay. I either need to be able to do this or fine some other device that can flip a switch every time the power button for the DemoN is pressed.
 

oblivioncth

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Apr 13, 2012
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CR_EN carries voltage at standby and is 3.3v when the DemoN is activated. Don't know if this helps.
I am using a CR3 Lite so I am not using that point directly, but if I tapped into that wouldn't it interfere with togging the power of the CR3? If not That could work because I could just get a relay that requires a voltage higher than the standby voltage.
 

oblivioncth

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Apr 13, 2012
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Dur a diode makes total sense. Also I was thinking about the CR_EN point on the Coolrunner attachment for older revs. I didn't realize there was another point for it on the DemoN itself. I think this could work. Thanks a bunch!
 

oblivioncth

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Apr 13, 2012
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Yeah, it's 3.3v when the DemoN is activated and 0v when it's off. It's these values whilst the PSU is connected.
Sounds good then. Any model of a diode you recommend? I mean I can just go to radioshack and an ordinary diode should do the trick.
 
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oblivioncth

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Apr 13, 2012
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One last thing. It is 3.3V when the DemoN is activated (but console is on standby with PSU plugged in), but is it also (and I would think it is) 3.3V when the console is actually on?
 

oblivioncth

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Apr 13, 2012
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What sucks it that I am having a hard time finding a relay that powered by 3.3V (or 3V). Tons of 5V ones but the DemoN doesn't carry that much voltage anywhere.
 

oblivioncth

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Apr 13, 2012
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Sorry to pick this up again, but I have been talking to someone on a circuits forum and they were saying that I could just use something like a 1n4007. Is there any reason that the 1N4148 is more desirable? I don't mind using the 1N4148 I am just curious as to why you recommended it other than the fact that I have seen it used in Xbox modification before.
 

oblivioncth

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Apr 13, 2012
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Ok, I do have a bunch of left overs and from what I read on the wiki article it does seem to be very efficient. Also, if you know anything about this, there was a worry about the relays "inductive kick" blowing through the diode?