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Idea, connect another 5V regulator before the 3.3V regulator. That will decrease the difference of potential on the 3.3V reg, keeping things cooler :-)Another alternative if you don't want to increase the parts number, would be to connect the input of the 3.3V reg to the output of the existing 5V regulator.. I prefer the first option though..
It is still a good idea to install some heatsink on the regulators :-)
Yes, and there are many that can do that.. Please have a look at this video, it explains it quite well.https://www.youtube.com/watch?v=IrB-FPcv1Dc
Hi, nice Instructable.. You can use a P-Channel MOSFET (instead of the protection diode), with the Drain connected to the positive of the Power Supply, and the Source connects to the AMP's V+, and the gate connects to ground. Make sure you choose a Mosfet with a maximum "Gate - Source" voltage higher than the supply voltage. Something around 20V should be Ok.The advantage is that the voltage drop across the Mosfet is negligible. Make sure you also choose a Mosfet with a low RDSon (ON resistance).