Delay Line Oscillator

217

03:12:43

*Very* sensitive to simulation quality! :D

Self-starting oscilator with a relatively clean sine wave output.

Minimum load impedance: 9kΩ

Any load on the simulator makes it go funny. :(  This at 333μs/s.  Adjusting a sine wave source makes it temporarily lose output power! ... Whoa!  It was about 180 degrees out of phase with the sine wave source, so I set the sine wave source to 180 degrees phase, and the oscillator followed it to remain about 180 degrees out of phase! :D  On re-starting the simulation, it's *still* about 180 degrees out of phase!  I wonder if there's a way to abuse this? :>

I'm almost sure I could make it better with a disconnected AC source, (thanks jason9,) but I wanted to publish this like it is because it's so weird!

I was hoping I could use this quick-to-make oscillator with AC simulation to get a harmonic distortion graph, but AC simulation doesn't work like that.  I wish EC had a proper spectrum analyzer. :<

published 7 years ago

hurz

7 years ago

Check my comment in description http://everycircuit.com/circuit/4952358655361024

jason9

7 years ago

You can remove the inductor on the left and it will still oscillate, although it will be at 5kHz.

eekee

7 years ago

@jason9: Do you mean shorting out the inductor on the left? That works, but it's an ugly waveform. Could be useful, anyway.

eekee

7 years ago

@jason9: Your way would be better for feeding a logic gate, with some adjustment for peak voltage.

eekee

7 years ago

@hurz: Thanks! Good description. Small problem: You changed things for low THD, but when your version reaches its final amplitude, there's visible distortion on the scope! XD It's worse than mine at present. Mine has a little visible distortion, the upper peak is slightly sharper than the lower, but it's not so clear unless overlapped with a perfect source. Yours has a kink in the lower peak of the signal at the collector or the upper peak at Rbase-L-C2.

eekee

7 years ago

I detuned the left L & C a little to see what would happen, and saw a hint of the same kink in mine.

eekee

7 years ago

I wonder if it could be set up with the transistor always conducting, not switching at all.

eekee

7 years ago

@jason9: I left a comment on your Miller Effect cct.

eekee

7 years ago

New one up: http://everycircuit.com/circuit/6530399416352768

jason9

7 years ago

About the miller effect circuit, try adding a diode in series with the 100uF capacitor such that it lets it only charge but not discharge. The orange and green lines become almost indistinguishable even when it starts clipping once it’s fully charged.

eekee

7 years ago

@jason9: continuing on your Miller Effect circuit. Sorry if awkward.

jason9

7 years ago

I gave a link.

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