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View Full Version : Using AmpSwithc or similar to automatically turn on T-Amp?



nicky6
2006-04-23, 01:10
Hi

I'm wondering if anyone out there have used Felix' AmpSwitch to make the SB turn on a T-amp.

I read on the Slimdevices forum that someone have used Felix' AmpSwitch to turn on active speakers.

I'm interested to hear how you have solved the voltage to Felix AmpSwitch together with the t-amp.

I myself have bought a pair of t-amps and have hooked one up to a sealed motorcycle battery that I had lying around. That t-amp I now want to be able to turn on/off automatically when turning on/off my SB3.

any help is apreciated.

Best regards
Niclas Cederlund

peter
2006-04-23, 03:13
On Sun, 23 Apr 2006 01:10:17 -0700, "nicky6"
<nicky6.26pjyz1145780101 (AT) no-mx (DOT) forums.slimdevices.com> said:
>
> Hi
>
> I'm wondering if anyone out there have used Felix' AmpSwitch to make
> the SB turn on a T-amp.
>
> I read on the Slimdevices forum that someone have used Felix' AmpSwitch
> to turn on active speakers.

I've used Felix' circuit diagram to build switch inside an extension
cord that powers the active speakers in my living room. My electronics
skills are fairly limited, but I got it to work after first mounting the
transistor the wrong way around. Note that ampswitch doesn't work if
you're using Squeezenetwork.

> I'm interested to hear how you have solved the voltage to Felix
> AmpSwitch together with the t-amp.
>
> I myself have bought a pair of t-amps and have hooked one up to a
> sealed motorcycle battery that I had lying around. That t-amp I now
> want to be able to turn on/off automatically when turning on/off my
> SB3.

I also have two T-Amp's and I intended to do what you're planning first.
But mine are plugged into an AC adapter and they use so little power
that I decided to keep them on permanently. They're quiet enough for
that, I only hear a little noise if I put my ear against the speakers.

I asked Felix if changing the relay to a 12 volt version would be
enough, and he suggested changing the resistors to 3.3k ohm as well (no
guarantees, of course, if you break anything, you get to keep the
pieces). I think the t-amp housing is big enough to put the circuit
inside the battery compartment. I intenden to add a manual override
switch and a mini-jack connector to the housing. That way the only thing
needed to use ampswitch would be a jack - jack cord running to the SB
headphone connector. Quite an elegant solution for an SB T-Amp combo...

Regards,
Peter