Re: small signal NPN transitor for muting microphone
- From: "Frank Bemelman" <f.bemelmanq@xxxxxxxxxxxxxxxxx>
- Date: Mon, 23 Jan 2006 00:51:34 +0100
"RR" <RR@xxxxxx> schreef in bericht
news:dr0uc7$ev7$1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hello Frank
>
> Thank you very much for the reply.
>
> The switch is part of the microphone. About five meters away and will pick
> up some noise. Actually the switch is part of the microphone. Two extra
wire
> comes out of the microphone.
>
> My apology for no explanation for the diode.
> I have now uploaded second image to explain why I need diode (Diodes).
> http://www.psv.co.uk/MicMute2.JPG
>
> I hope this new image will do some explanation.
>
> My main worry is the diode. I think having this diode in pararal with
> base-emmiter might reduce ON resistance of the transistor. In any case my
> another worry is that, will transitor offer low ON resistance at very very
> low current? Some quick search on transistor database gave me some basic
> answer about ON resistance, But it only specifed at 3mA.
>
> Thank you very much for your help.
Please do not top post, put your replies on the bottom.
Okay, I saw your new schematic. If you are going to mute the output, what
is the point of muting the input?
--
Thanks, Frank.
(remove 'q' and '.invalid' when replying by email)
.
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