Speaker protection/relays? Headphone bypass? - diyAudio
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Old 20th December 2012, 03:55 AM   #1
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Join Date: Sep 2012
Default Speaker protection/relays? Headphone bypass?

I built by first stereo! yay!

It sounds better than anything I've heard... well, ok, first there was all kinds of noise but then I realized I was using an input from my computer and I had the output @ 100%. Once I turned that down to about 90% all the noise cleared up and it sounds amazing.

One problem though. If I have the preamp circuit turned up at all, and I power off the amp (the switch kills the power to both transformers, the pre and power amps...) it's silent for about 1 second and then I hear a squeel that descends and then I get a big "pop" sound. To me it sounds like capacitors dumping, but hell if I know.

I'm assuming this is what the "speaker protection" relays I've read people are using are for. I've done lots of searches but unfortunately all I'm finding are post from people that clearly know what they are, what they're for and how to design them. I do not. So if anyone could link me to some relevant reading material I'd appreciate it. Is it as simple as adding relays of the appropriate wattage ratting between the speakers and the power amp? It seems it takes a full second for the caps to dump... so if the relays lost power at the same time as everything else it seems like it would take care of it for me, but being a noob, I dont want to guess.

Lastly, occasionally my very mean wife forces me to use headphones. Any links relating to how headphone jack bypass's work would be great. Even if I have to flip a switch, that'd be fine. I'm just not sure what I should be powering down or not. Perhaps I could shut off the same relays? I dunno... any tips or links would be great! Thanks!
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