NC analog switch, but...

[quiasmox@yahoo.com]

Are there any analog switches that are closed when unpowered (Vcc=0)?
This is to clamp an audio output going to a powered speaker with
auto-power switching, so the speaker won't turn itself on from tiny
noise inputs.
I know there are other ways to do this, but.

 

[John Devereux]

Are there any analog switches that are closed when unpowered (Vcc=0)?
This is to clamp an audio output going to a powered speaker with
auto-power switching, so the speaker won't turn itself on from tiny
noise inputs.
I know there are other ways to do this, but.

Depletion mode mosfets can do this. Also there are some normally closed
solid state relays (which themselves use depletion mode mosfets). Or, of
course, an actual mechanical relay which would seem to be the simplest
solution here!

 

[bloggs.fredbloggs.fred@gmail.com]

Are there any analog switches that are closed when unpowered (Vcc=0)?

What's the matter with the usual NO analog switch in series? There are versions that input protected while powered down.