Modifying A SCART to HDMI Adapter...

Jdurg

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Hey Guys. Before I go into the advanced forums on the web where this simple electrical question would be laughed at and shunned, I wanted to post here in a more friendly environment. :)

I've got myself an SNES which I have hooked up to an HDMI adapter/scaler. Amazingly, the scaler doesn't introduce any additional lag that I can notice so I'm happy sticking with it.

The only issues are that it automatically stretches the input signal to 16:9 without pillarboxing it, and the device is always on which creates additional heat that I'd like to avoid. (Plus, it means my autoswitcher can't detect when the SNES turned on).

The case in the scaler has some room so I'm thinking of adding in a little circuit that will only allow power into the adapter/scaler when it detects the 5V output from the SNES.

My question is, can this be done? I can easily tap into the SCART connector on the board and the DC input connector. Just wondering if the 5V line from the SNES is consistent enough so that the adapter doesn't turn off during gameplay. Also wondering if a type of circuit like this can be created from resistors/capacitors/diodes/etc. and not needing any type of IC in there.
 
Okay, I think this actually can be done. If I use an AND gate and hook up one input to 5V DC power input on the adapter, and the other input to the 5V line coming from the SNES on the SCART connector, when i turn on the SNES it will cause both inputs to be 5V and thus allow 5V to the rest of the adapter board.

Will go and look up circuitry and see what else i might need to include in the basic circuit to make sure nothing gets fried. Have a TON of spare parts from a dead A/V Receiver i can harvest to build this.
 
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