Phase Shift Oscillator 2

199

02:10:48

Was Delay Line Oscillator 2.  Update with lower distortion, higher realism.  Gain was reduced to reduce distortion, but then making the inductor more realistic (with series resistor) was found to help more.  The transistor is now high-gain.

DC resistances for 2 real 300mH inductors found: 3.5Ω and 6Ω.  3.5Ω inserted.

It's still probably not the best circuit for the job.  For one thing, I think distortion is sensitive to forward beta.

~ Original text
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Slightly lower distortion, although it's hard to measure in EC.  One of the coils wasn't needed.  The output is now taken from the connection Rb-L-C2.  The transistor's gain has been reduced and a hefty base resistor (Rb) inserted to reduce its effect on the oscillation.  The transistor now barely turns off.

It's not perfect.  I'm sure it would be better with an op-amp.

I didn't put a load in this time.  I figure a high-impedance load isn't hard to provide.

published 7 years ago

hurz

7 years ago

What is your target? For a lowest destortion this is definitive the wrong way of design

eekee

7 years ago

Indeed. It's much better to use an op-amp. My target is "quick to assemble, reasonably good sine wave. The op-amp version I published is better quality and no more complex.

hurz

7 years ago

First, then please forget this zero R 300mH!

eekee

7 years ago

Good point!

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