I have seen simple muting circuts using either a JFET or even a small
bipolar clamping the signal to ground.  The signal is passed through a
largish value resistor first.  This is used even on high end car stereos
systems like Kenwood and Alpine.

Regards

Mike Rigby-Jones

        -----Original Message-----
        From:   Andre Abelian [SMTP:engelec@EARTHLINK.NET]
        Sent:   Monday, July 12, 1999 1:28 PM
        To:     PICLIST@MITVMA.MIT.EDU
        Subject:        analog switch

        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