Hope to get some great ideas on this.
I have set up a passive speaker system with a rack mixer and a power amplifier along with a couple of speakers. I would like to power it all on with one "master" switch but since the amp powers up faster than the mixer I get some "Popping" from the speakers when the mixer turns on. Is there any way to build a delay of some sort for the mains to the amp so that the mixer turns on before the amp so I get rid of the "pop"? Would love to be able to have a "one-switch" solution for it.
There are commercial power sequencers like Furman M-8S ($200) that would certainly do what you want. A lower-cost option might be to use a current sensing/"smart" outlet strip. Here is one on Amazon. Note that I have not tried these for this use, though I have used the Furman.
You could possibly build something yourself, but the serious fire and electrocution risk means that it is better to purchase something.
Thanks for the reply. The Furman gear isn't really something I can use for this set-up. The rack mixer has it's own power converter that I can't connect to the Furman. I have, however, gotten in contact with an expert in electronics that will try to help me out.