[AMRadio] Simple, Inexpensive, high quality mic preamp / equalizer / compressor - schematic and circuit details

[Steve Cloutier, 978-597-3311]

Hi!

As part of the class E kit project, I have developed a self-contained 
microphone preamp / equalizer / peak limiter (compressor).

The circuit is designed around an Analog Devices SSM2166P.  The circuit is 
designed to accept the output of a low impedance microphone, such as a 
Radio Shack electret condenser element, and provide a high fidelity, 
transmitter-ready output.

While this circuit was designed as part of the class E kit project, it is a 
stand-alone unit, which can be used with any transmitter which will accept 
between a .5V p-p and a 1V p-p (line level) signal.

The circuit and desciption is available at:

http://www.netway.com/~stevec/ham/ssm2166_compressor.gif

Please let me know if you have any questions or comments :-)

Regards,

Steve WA1QIX


At 08:12 PM 7/31/2002 -0700, you wrote:
>Mahlon,
>
>I don't know the whole story, but I do know that my GSB-100 also had a
>12AT7 in place of the 12AV7 when I acquired it. I can guess that it was
>a popular substitution because (1) the AT7 is a helluva lot more common
>than the AV7, and (2) it worked. I tried a 12AV7 in mine (I had exactly
>one in a junk box of hundreds, maybe thousands, of tubes) and there was
>no noticible difference in the XTAL osc. output.
>
>Enjoy the GSB-100 on SSB, and even AM, but there are much better choices
>of transmitters available for the latter.
>
>73,
>-Larry/NE1S
>
>Mahlon Haunschild wrote:
> >
> > Hello, list.  This question isn't exactly AM-related, but the equipment
> > in question is in the same vintage so I guess it's OK (besides, I do
> > plan on at least TRYING AM on it eventually) anyway, here goes:
> >
> > Just acquired a Gonset GSB-100 transmitter over the weekend, and
> > everything appears to be in order with it except for the crystal
> > oscillator tube (V10).  The book lists a 12AT7 in this location, but the
> > book's schematic and the transmitter itself show a 12AV7 instead.  WHich
> > is correct?  These two tubes aren't nearly the same, but on the other
> > hand the transmitter works, so should I just not worry and be happy?
> >
> > --
> > regards,
> >
> > Mahlon - K4OQ
> >
>
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