Rick Campbell KK7B designed a series of direct conversion radios with 50 ohm audio amps. See this link for details. May be some ideas you can use in yours. They work very well.
Paul
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On May 20, 2019, at 3:48 PM, k7da <k7da@...> wrote:
the output should be audio. a small xfrmr of what ever impedance you need, should do the trick. ebay has a lot
dave k7da
On 5/20/2019 12:41 PM, Richard Seguin wrote:
Hello,
I'm designing an audio stage after a BFO diode ring mixer and I seem
to be having trouble converting a 50-ohm impedance to something the
amplifier can handle (10K input). I know how to convert impedances
with RF signals using toroids, and I assume that the exact same would
apply to audio. Does anyone know of a toroid or ferrite core that is
decent at audio frequencies?
Richard (VE1XOR)
