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Re: Impedance matching for the audio stage


Paul Martin
 

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

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)


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