[divie23]

Is there any benefit in using a DPDT switch to 1) switch the live wire on the STEPS input and simultaneously 2) switch the output from the STEPS to the PPA ?

 

[jarthel]

how is turning them on at the same time using a dpdt different from a simple switch which just turns on the psu?

just use a thermistor like cl-80 to control current rush.

 

[divie23]

I was thinking more about the behaviour when turning OFF.

 

[NeilR]

Quote:

Originally Posted by divie23 I was thinking more about the behaviour when turning OFF.

If the PPA has diode D1 installed, it should accomplish the same thing- preventing the amp from reverse biasing the supply.

 

[divie23]

Perfect. Thank you NeilR.

 

[NeilR]

Quote:

Originally Posted by divie23 I was thinking more about the behaviour when turning OFF.

Just as an aside, with all the discussions over time of reverse biasing problems at shutdown, I'm surprised that I don't recall ever seeing this very simple solution offered. In your case, with the PPA, it probably would not do anything more than PPA D1 does for you, but for an amp that isn't reverse bias protected, this is a very elegent solution. Adding a diode has other benefits, of course and I don't think I would want a serious wall powered amp without one, but it is an interesting mental exercise. A diode is also cheaper than upgrading to a DP switch if cost is the main concern.