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Subwoofer auto on/off switch?
Subwoofer auto on/off switch?
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Old 30th May 2002, 03:03 PM   #1
Axeman is offline Axeman
diyAudio Member
Join Date: Jan 2002
Location: Nova Scotia Canada
Question Subwoofer auto on/off switch?

Hello fellow DIYers!

I have recently built a subwoofer for my home theater system, and I am looking for a way to create an on/off switch that detects incoming audio, and keeps the amp on for a minute or two after audio has stopped. I'm planning on using a PC power supply and a car amp(I have worked out the amperage draw and the PSU will handle it), so turning the whole contraption on can be easily done by connecting two pins on the motherboard connector. I was thinking I could use a relay connected to the audio in that would turn on the amp if the voltage was above 1V or something, but that wouldn't work well because I think the audio would be AC and would turn the amp on and off with the waveform. Also, the amp would shut off immediately once audio ceased. Any suggestions would be appreciated!

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Old 30th May 2002, 03:45 PM   #2
TG is offline TG  Ukraine
diyAudio Member
Join Date: May 2002
Location: Kiev, Ukraine
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Hello Axeman,

Maybe this will help you:
This is schematics for Rane HC6 headphone amp.
It has an LED indicator of signal presence (bulit with Z011C opamp, page 2). It gives an idea to auto-switch-on circuit. For switch-off you may use usual hint with large capacitor bypassed by diode parallel to relay coil.

Good luck!
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Old 30th May 2002, 06:07 PM   #3
shadow is offline shadow
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Join Date: Feb 2002
Location: Slovenia
and this: http://sound.westhost.com/project38.htm
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