By changing to the output - or "DC side" you can control the power going to the amp. However, the PSU is ALWAYS on and so is the Charger. And no, it's not like a bridge rectifier.Ah right ofcouse it's like a bridged rectifer right? What if I changed the switch to the dc side of the circuit instead of the ac side would that work?
Controlling their output is not the way to handle this unless you want to have a master switch that can turn both the PSU and the Charger on at the same time. THEN you have control over the circuit. All you're doing is selecting the DC source for your amplifier.
There are so many different ways you can control this but it's not the way I'd go with this if it were my project. I still think I'd go with the rotary switch, transistors and relays (and a couple flyback diodes).
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