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Will this circuit oscillate ?


Kevin Kilzer

Jan 1, 1970
As long as R1 and R3 are open or infinite resistance it will.
Otherwise, it might.

Although I agree in principle, you probably need to have a finite R1
and R3 to help keep the frequency stable over temperature. Getting it
right will be the problem.

While we are at that node, though, there is the distinct possiblity
that the base-emitter junctions could be reverse biased with every
cycle. Many transistors have a low b-e breakdown voltage, and
reversing that junction can blow it out. Adding a reversed diode from
base to emitter usually fixes that problem, but costs you the extra