Re: Low mic gain, was, show your mic
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please see the photo here.
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The right side pin is for Ground.
if i recollect , a reverse polarity was also responding for voice but verey very lowand distorted.
On Sun, Apr 22, 2018 at 10:15 PM, MAX <max@...> wrote: Hi sarma. ? I¡¯m sure I have the polarity correct.? Someone on this list posted a drawing showing how to identify the negative terminal and I wired according to it.? I think the electret mic wouldn¡¯t work at all if polarity were reversed.? What is being powered is an ?F E T source follower.? ?I think I shouldn¡¯t have to raise my voice to get 5 watts output on 40 meters. ? Regards. ? Max K 4 O D S. ? I've Never Lost the Wonder. ? Antique Electronics Site: ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Mvs Sarma
Sent: Sunday, April 22, 2018 3:44 AM
To: [email protected]
Subject: Re: [BITX20] show your mic ? ?please check whether the mic body is connected to chasis ground. i mean the positive bias voltage for mic should come on independent pin and NOT to the body pin of the eletret element. In case you are using a dynamic mic, perhaps we need more gain and your need to shout appers logical. regards sarma vu3zmv
? On Sat, Apr 21, 2018 at 11:27 PM, MAX <max@...> wrote: Speaking of mics, I have to raise my voice almost to the level of shouting to get 5 watts out on 40 meters.? Is this normal or should I look for a problem? ? Regards. ? Max K 4 O D S. ? I've Never Lost the Wonder. ? Antique Electronics Site: ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Mvs Sarma
Sent: Saturday, April 21, 2018 7:17 AM
To: [email protected]
Subject: Re: [BITX20] show your mic ? I had grabed a taperecorder mic with 3.5mm mono pin.
?replaced the cable with 2+shield.had a small pushed switchmounted and wired.
?repalced the 3.5mm momo pin to stereo pin. Here is a image of my mic.The pp9 battery helps to imagine the mic size.
regards
?sarma
?vu3zmv
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