[MRCA] AM-142/AIC Amplifier Query

[Al Klase]

Jeep,

I don't know this particular amp.  However, in audio circuits, "mixing" 
generally refers "summing" of audio signals, rather than heterodyne 
mixing.  Typically, the signals from a number of sources are summed in a 
resistive network, that provide isolation between sources.  An 
amplifier, perhaps 20 dB or so, is used to make up the loss through the 
summing network..
So, the AM-142 is likely a straight forward amp.  Leave the feedback in 
place.

73,
Al

Al Klase -- N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 8/22/2015 7:59 AM, DSP3 wrote:
> I have a question.  I got a pair of these "mixer" amplifiers at a 
> hamfest.  Looking at the schematic and reading what little info is 
> available, might I assume that these are simply unity gain amplifiers 
> with the input and output Z as specified on the transformers?  If I 
> were to disconnect the feedback windings of the output transformer and 
> ground the low side of each input secondary, would this revert the 
> thing to a simple amplifier?  Or, am I missing something?  Also, 
> what's being mixed?  Looks like the mixing, per se, is done back at 
> the master unit.
>
> Jeep - K3HVG
>
>
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