work.
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15 years ago
Transistor question
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15 years ago
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This is not correct, the circuit works with a low impedance supply.
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15 years ago
feedback with no net phase shift will not cause oscillation
if you've got over unity gain in a phase-shift free loop you end up 'pegged' against one rail or the other.
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15 years ago
On a sunny day (4 Jan 2009 12:09:02 GMT) it happened Jasen Betts wrote in :
Yes, you are right, the period time of the oscillation then becomes infinite. A flip flop.
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15 years ago
Care to try that analysis again? Charged through the 4.7 Meg, discharge through Schmidt trigger 1st base.
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15 years ago
On a sunny day (Sun, 04 Jan 2009 11:21:14 -0800) it happened JosephKK wrote in :
No, the cap is charged via the base emitter of the 2907 and 680 Ohm, with the + on the + side of the cap, as I stated.
The discharge is via the 4M7.
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15 years ago
Is that what you think?
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15 years ago
John, it is a blocking oscillator, and about 90% efficient.
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15 years ago
This would only be true if the circuit is phase-shift free all the way down to DC. Though off hand I can't imagine a simple circuit that would be phase shift free at higher frequencies, but not DC.
The circuit in question is not phase shift free at any frequency. It contains a 360 degree phase shift, and unity gain, at its switching frequency. The output waveform is not sinusoidal (by any stretch of imagination) because of extreme non linearity.
Sylvia.
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15 years ago
No way in hell spud. The 4.7M is the only possible charge path. Or did the reverse polarity designation fool you?