Re: small signal NPN transitor for muting microphone
- From: "Phil Allison" <philallison@xxxxxxxxxx>
- Date: Thu, 26 Jan 2006 16:13:46 +1100
"Ian Du Rieu"
>> What I am trying to do is, mute the microphone by using the transistor as
>> explained in the circuit. I can un-mute it by closing the switch. All
>> this
>> works fine on one unit I have modified. I need to modify about 200 units.
>>
>> My question is, can you see any problem with the circuit?
>> BTW new parts I will be adding, are:
>> one 4.7K register, one Transistor, one diode and a switch.
>
> Why not use a MOSFET?
** That darn body diode plus higher cost.
> It will handle the small AC signals perfectly,
> provided you don't yell into the mic & cause the MOSFET's diode to turn
> on.
** Junction fets are sometimes used ( ie J111, 112, 113 ) - but have on
resistances 50 to 100 times greater than a small signal transistor.
......... Phil
.
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