Sorry for the late reply !

I have used LDR's to mute analog signal lines.

I sandwich a grain of wheat lamp between two LDR's, ( stereo )
slide them into a rubber tube (2.5mm three core flex outer insulation
normally) and seal the ends with  black silicone

On the LDR's I use, the resistance varies from ~50 Ohms (light on)
to over 20 MOhms (light off).

I normally supply a second unswitched power source to the lamp
via a pot, so I can use it as a preset attenuator, not full mute.

The attack and decay characteristics of this setup are very pleasing.
The mute time is slow (like a record ending), the attack is a lot faster
but still very smooth ( ~ a quarter second ).

And of course the signal is completly isolated

Andre Abelian wrote:
>
> Hi to all engineers.
> last night I made a small circuitry to mute the analog line
> the pic part works ok  but analog section didn't work at all.
> on output when I add 10k pull up resister works fine but I can't
> do that on audio line.
> I connected pic with max4066 analog chip. the problem
> I found is that 4066 needs voltage on output  to operate
> which we do not have it my question is this is  there any part that can
> be used to mute the analog line "audio" beside relay ?
> any help will highly appreciated.
>
> Andre

--
Peter Cousens
p.cousens@cwcom.net