Hi
I have read about grounding the outputs on preamps and such (with a delay and relays) to avoid a thump in speakers at power on but how do I apply that on my soundsystem on my computer?
I got an amp (from old active speakers) connected to Line out on the soundcard and a couple of Zigmahornets hooked up to the amp.
Grounding the amps inputs doesnt feel right but maybe with a small resistor between signalpath and the relay (and the relay to ground)?
Well, any suggestions would be thankful.
I have read about grounding the outputs on preamps and such (with a delay and relays) to avoid a thump in speakers at power on but how do I apply that on my soundsystem on my computer?
I got an amp (from old active speakers) connected to Line out on the soundcard and a couple of Zigmahornets hooked up to the amp.
Grounding the amps inputs doesnt feel right but maybe with a small resistor between signalpath and the relay (and the relay to ground)?
Well, any suggestions would be thankful.
I'm currently building this power supply for a large amp, and it has a 'soft start' relay on the AC input to the transformer. There are probably many designs for this, the link has a short section explaining the circuit. Another way is to use a relay to mute the output of the amp, which is also relatively easy.
It depends on how robust the output stage is and whether they designed it to survive an output short.MammaMumin said:
I would play safe and measure the output impedance of the sound card. This will give a clue to whether a protection resistor has been included.
Simpler to add a 220r followed by the muting relay or FET.
But even 220r may be too low to offer sufficient loading. I would NOT increase this to 1k0. It will make the next stage and the interconnects difficult to drive.
But, if fitted at the receive end will have much less effect.
Didn't play safe 
but ran in to some other trouble. Forgott that I had a split from the soundcard output. Signal goes to the amp and a switch (the switch gives me the option wether to use my headphones with the computer or my stereo).
And to make it even more funny I had reversed + and - (soldering at night, tired and sleepy) from the power adaptor. Blew the timercircuit but the amp and soundcard's ok. Anyways, the inputs where shorted but the signal level where really low, volyme down at the headphones. So to speak.
I guess the split messes things up. Maybee have to solve this another way.
but ran in to some other trouble. Forgott that I had a split from the soundcard output. Signal goes to the amp and a switch (the switch gives me the option wether to use my headphones with the computer or my stereo).And to make it even more funny I had reversed + and - (soldering at night, tired and sleepy) from the power adaptor. Blew the timercircuit but the amp and soundcard's ok. Anyways, the inputs where shorted but the signal level where really low, volyme down at the headphones. So to speak.
I guess the split messes things up. Maybee have to solve this another way.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.