[sdiy] Blocking audio at power off

[Justin Owen]

-----Original Message-----
From: Roy J. Tellason [rtellason at verizon.net]
Received: 09.09.2008 16:15:39
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Blocking audio at power off

On Monday 08 September 2008 09:46, Justin Owen wrote:
>> Hey all,
>>
>> Probably hoping for too much here - but what's the absolute simplest way of
>> blocking an audio signal through a circuit when it is powered down.

>Feed the audio through a relay,  when power to the coil goes away,  the 
>contacts open...

Thanks all - a few people have suggested a relay as the way to go.

Rapid have this on special - 12 Volt, Normally Open...

http://www.rapidonline.com/Electronic-Components/Relays-Solenoids/PCB-Relays/Miniature-relay-SPNO-6A/28668

Circuit is single supply 9 volt...

I guess it would live between the circuits audio output (the Collector of a 2N3904 Transistor) and the live pin of the physical audio out Jack?

Thanks much

Justin