[sdiy] Blocking audio at power off

[harrybissell at wowway.com]

If the 9V is from a battery, the relay is not the best way to go.
The coil power consumption would be too high

H^) harry



On Wed, 10 Sep 2008 13:06:34 +0000, Justin Owen wrote
> -----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
> 
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Harry Bissell & Nora Abdullah 4eva