You could always copy the preamp section of the KAF2 on a small piece of .1" perf board and install it on the audio filter headers. It would be all of one IC and half a dozen leaded components. My guess is that you could do it all for less than $20 even if you needed to buy all new parts at Radio Shack.
73, ... Joe, W4TV On 9/27/2013 9:38 AM, Allan Taylor wrote:
It doesn't have to work as a filter either! It just needs to give some audio gain and be cheap.
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