Wheres the feedback

100

02:18:06

I made it randomly, but can't trace the positive feedback 

published 9 years ago

abobaker

9 years ago

I think it's the tank at the base of the transistor, and is fed through the miller capacitor

abobaker

9 years ago

http://everycircuit.com/circuit/5785804989530112

thebugger

9 years ago

That's what I was thinking, anything else seems implausible. The miller Capacitance is usually related to high frequency negative feedback, but the LC circuit must be phase shifting the input somewhat.

yra

9 years ago

Could it be the voltage divider on the Supply line feeding the coil at the transistor and the coils at the top with diode making a feedback loop.

thebugger

9 years ago

It's oscillating without them as well

thebugger

9 years ago

I think it's a combination between the biasing mode and the LC base circuit

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