Need electronic audio switch

Discussion in 'General Electronics Chat' started by selfbg, Feb 14, 2014.

  1. selfbg

    Thread Starter Member

    Jun 11, 2010
    23
    0
    For my project I need to do something like bypass.

    I've seen a lot of schematics with J112 and with diode (mostly 4148) connected to the gate. What is the purpose of this diode??

    Also, is it possible to replace this P-channel JFET with general purpose MOSFET? This is because J112 are hard to find and are expensive...

    10x in advance,
    Stefan
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,006
    3,232
    Show the schematic.

    The J112 is US$0.51 at Mouser Electronics.

    What is "something like bypass"? :confused:
     
  3. selfbg

    Thread Starter Member

    Jun 11, 2010
    23
    0
    [​IMG]

    Don't mind transistor names in the schematic. :)

    Well 0.51 is out of my league price. I target something like 0.1 or less.
     
  4. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    If I was to design sound system not in the high end range. And at the same a cheapskate, I would have used the CD4066B as switch. One package contains 4 switches
     
    Last edited: Feb 14, 2014
    absf likes this.
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