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View Full Version : Use SB3 to switch a relais?



Heimiko
2006-01-27, 07:31
Hello,

I would like to mod the SB3 to trigger a relais upon powering up the unit (and also, deactivate it ofcorse when powering off). I would like to do this, to power up my amp. This way, i can turn on/off all that I need with the push of 1 button.

Anyone any idea what part of the circuit gets powered on/off, what amount of voltage at what point to take for the relais? I got some 12Volt relais laying around, they have a res of 350 ohm, thus taking about 35mA at 12V.

I do have a multimeter, and i can ofcorse poke around, but I want to know for sure that i can draw some current before soldering a wire and finding out that activating the relais would blow up some IC ;-)

Any suggestions / insights?

Claus-DK
2006-01-27, 09:05
Hello,

I would like to mod the SB3 to trigger a relais upon powering up the unit (and also, deactivate it ofcorse when powering off). I would like to do this, to power up my amp. This way, i can turn on/off all that I need with the push of 1 button.

Anyone any idea what part of the circuit gets powered on/off, what amount of voltage at what point to take for the relais? I got some 12Volt relais laying around, they have a res of 350 ohm, thus taking about 35mA at 12V.

I do have a multimeter, and i can ofcorse poke around, but I want to know for sure that i can draw some current before soldering a wire and finding out that activating the relais would blow up some IC ;-)

Any suggestions / insights?

I suggest that you have a look at this:
http://www.gwendesign.com/slimserver/dev_hard_and_software.htm#ampswitch

Regards
Claus

Heimiko
2006-01-27, 09:30
Looks interesting... however, my headphone stage is probably gonna get disabled, since i will perform the "analog mod", which cuts signals downstream to the headphone-jack.

As you understand now, I need a different approach...

Suggestions, anyone?

gonk
2006-01-27, 12:58
I think most solutions, simple, and not simple, for this have been covered in these threads:

http://forums.slimdevices.com/showthread.php?t=17974
http://forums.slimdevices.com/showthread.php?t=15796

If you find an internal signal to hook up a driver to a relay to, please let me know. The problem is that nothing is turned off internally when the SB is powered down. All outputs remains active.

Or vote for this bug that might help you:

http://bugs.slimdevices.com/show_bug.cgi?id=1397