It really pays to check Wes Hayward's web site. I looked yesterday and found something that we really need: A termination insensitive amplifier for audio frequencies -- an AFTIA. Just last week I was looking at the AF amplifier of my Mythbuster rig, wishing that it had TIA properties. Now, thanks to Wes, we have a circuit available: http://w7zoi.net/audio-fba.pdf
And let's not forget that it was Wes Hayward W7ZOI and Bob Kopski K3NHI whose 2009 article alerted us to the RF variety of termination insensitive feedback amplifiers.
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That is good to know. I wonder if you could apply AGC to that ;^)
ReplyDeleteVK3HN.
JFET across the feedback resistor may do that. Some experimentation required.
DeleteI designed a slightly different circuit for use in my FT8 monitoring receiver.
ReplyDeletehttps://oshwlab.com/3ym3ym/ft8-monitoring-receiver