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A regen operates at the hairy transition of self-oscillation where
positive feedback yields a tremendous increase in gain. Doesn't matter whether it is vacuum tube or transistor. The only difference between remote-cutoff and sharp cutoff characteristics (transistors of the bipolar junction type are very sharp cutoff equivalents to tubes) would be on the amount of spurious garbage created when the regen jumps into full oscillation. But it does matter. In the heirarchy of regen devices tubes provide the "smoothest" regeneration, followed by FETs, with bipolar transistors generally taking a distant third. I am not asking because I have never built a regen. I have built DOZENS of them, and I sell a simple version on my website...but I'm always looking for a new approach. I know of no solid state equivalent (without some sort of AGC feedback loop) for the remote cutoff pentode. Does anyone know if there is? "AGC in a regen?" Here, I was speaking in more general terms and not referring to regenerative circuits. Experiment with it. I plan on it. For experimentation purposes, a high gain-bandwidth product op-amp IC might produce some interesting results. The gain-bandwidth (or 0 db open-loop gain frequency) of some op-amp ICs is up at 30 to 70 MHz now and the DC open-loop gain is enormous in comparison to vacuum tubes. I sense possibilities of an op-am regen or even a superregen on up through HF. Just a thought... :-) The voltage gain of an effective regenerative stage is can be as high as 100,000 as reported by Charles Kitchin. That's 100dB...not many op amps have that kind of gain at say 10MHz. Thanks for your comments. I always appreciate hearing from folks with lots of valuable radio experience to share. Bruce kk7zz www.elmerdude.com |
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