Hi rsan,    I haven't built one of these... I just re-drew Doughadfield's design as a courtesy to show how it could be mounted into a small plastic box...   I suggest getting someone in your area who is proficient in electronics to build you one... (the below schematic is much clearer than any pix of an actual wired box could be.)   [1] 1/4" stereo jack, [1] 1/4" mono jack, [1] 2N7000 Transistor and [1] SPDT switch and some hook-up wire. The wiring is soldered to the components to match the schematic and mounted in a small plastic box.     I hope this helps.   seeya   Joe   P.S. As mentioned before... if you are having hum from ground-loop problems... the above will not help. you will need to isolate using relays and an external power source as follows...    
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