03-21-2018, 08:55 PM
> I do see where cap 17 looks like gives some kind of feedback to the tapped IF transformer
Yes this circuit is called a regenerative detector and when adjusted properly has quite a bit of gain, much better that a simple diode detector. It uses feedback to amplify the rf signal and convert it to audio. It also can be quite selective depending on how much feedback is used. Not to be confused with a super regenerative detector which is very different.
If someone was interested in radio I would recommend building a simple regen set. It will get you a good sense of how oscillators work and how good a simple set can really pull in many signals. Something like this : http://onetuberadio.com/2017/04/11/1947-...ast-regen/ could be assembled in long afternoon after all the parts are sourced. Can also double as a signal generator and a dip meter in the right hands.
Yes this circuit is called a regenerative detector and when adjusted properly has quite a bit of gain, much better that a simple diode detector. It uses feedback to amplify the rf signal and convert it to audio. It also can be quite selective depending on how much feedback is used. Not to be confused with a super regenerative detector which is very different.
If someone was interested in radio I would recommend building a simple regen set. It will get you a good sense of how oscillators work and how good a simple set can really pull in many signals. Something like this : http://onetuberadio.com/2017/04/11/1947-...ast-regen/ could be assembled in long afternoon after all the parts are sourced. Can also double as a signal generator and a dip meter in the right hands.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
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