| Created by |
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| Created | December 29, 2012 |
| Last modified | January 21, 2013 |
| Tags | bridged-t oscillator |
A unique oscillator circuit with simple AGC.
A traditional oscillator is made of a frequency defining circuit, amplifying it,
and providing enough "Positive Feedback", to create & sustain oscillations.
Not so with this oscillator;
"Positive Feedback" provides "Fundamental Frequency + Distortion", through R1.
"Negative Feedback" provides "Distortion" only, through a "Bridged-T" filter,
which has removed only the "Fundamental Frequency", and passes all the "Distortion".
The "Amplifier" rejects the "Common Mode" "Distortion", amplifying the "Fundamental" difference.
Feedback amplification is ((R1+R2)/R1).
Set to a minimum helps reduce "Clipping Distortion".
Gain control is provided by D1, D2, + R3 "Clipper", shunting R2.
This circuit design should provide low distortion.
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I cannot make this work.It seems to me that the amplification is 1.20 whereas I would expect slightly more than 3.0 |
February 04, 2016 |
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Does this circuit actually operate? Is it possible that R2 should be 21.2k? I am attempting to convert a Heathkit vacuum tube audio generator to solid-state components in order to save heat. I would appreciate a reply. Edalamram |
February 09, 2016 |
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