Phase Shift Oscillator

383

08:14:06

The filter produces a phase shift that increases with frequency. It must have a maximum phase shift of more than 180 degrees at high frequencies so the phase shift at the desired oscillation frequency can be 180 degrees. The most common phase-shift network cascades three identical resistor-capacitor stages that produce a phase shift of zero at low frequencies and 270° at high frequencies.
http://en.m.wikipedia.org/wiki/Phase-shift_oscillator

published 12 years ago

thebugger

12 years ago

Its attenuating decrease the base resistor 1Mohm I way too much

DL3BUS

12 years ago

The Oszillator does not oscillate. Whats wrong?

januszwieja

12 years ago

Set transistor forward beta 200A/A , it works!

Karlberg

12 years ago

You may need to push the switch.

stanislav_maslovski

11 years ago

Hi! The description is a bit incorrect: in your circuit the phase shift is 0 at very high frequency, and -270 deg at 0 frequency, because you use a high-pass filter (the description you have would be valid for a variant of the same circuit with a low-pass .

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