Subwoofer auto on/off switch?

Axeman · 30th May 2002, 04:03 PM

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!

Phil

TG · 30th May 2002, 04:45 PM

Hello Axeman,

Maybe this will help you:
www.rane.com/pdf/hc6sch.pdf
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!

shadow · 30th May 2002, 07:07 PM

and this: http://sound.westhost.com/project38.htm

30th May 2002, 04:03 PM	#1
Axeman diyAudio Member Join Date: Jan 2002 Location: Nova Scotia Canada	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! Phil

30th May 2002, 07:07 PM	#3
shadow diyAudio Member Join Date: Feb 2002 Location: Slovenia	and this: http://sound.westhost.com/project38.htm __________________ Watching beginnings of social decay.... Virus - Iron Maiden

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
My GC STK4231-2 Subwoofer amp, should I switch to discrete?	EWorkshop1708	Chip Amps	5	28th December 2004 12:14 AM
Audio Auto Switch	mariorockero	Analogue Source	0	31st March 2004 03:30 AM
Subwoofer auto power on	the_DOOMer	Subwoofers	5	16th October 2003 11:12 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

30th May 2002, 04:45 PM	#2
TG diyAudio Member Join Date: May 2002 Location: Kiev, Ukraine	Hello Axeman, Maybe this will help you: www.rane.com/pdf/hc6sch.pdf 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!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)