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RC Phase shift oscillator
- Thread starter Binus01
- Start date
AlbertHall
- Joined Jun 4, 2014
- 12,660
Welcome to AAC, @Binus01
Please show a schematic of your circuit otherwise we would only be guessing.
Please show a schematic of your circuit otherwise we would only be guessing.
Okay thanks , below attached is the picture of the trials
Attachments
400MHz is optimistic for an LM358.
Component values suggest about 15kHz.
What size of the op amp would do
Generally, op-amps don’t do 400MHz.
For a phase shift oscillator to work, the amplifier must have gain of at least 20dB at the oscillator frequency, and very little phase shift of its own. So you need something with a gain-bandwidth product of >10GHz.
Good luck.
You should also learn how to calculate the component values, as you are out by more than four orders of magnitude.
https://en.wikipedia.org/wiki/Phase-shift_oscillator
At that frequency, any other oscillator would be more appropriate, except, perhaps, a 555.
At the nearby 418MHz popular remote control frequency, SAW (surface acoustic wave) oscillators are popular.
Even then special techniques in design and construction may be required.
Audioguru again
- Joined Oct 21, 2019
- 6,826
Your circuit has some serious problems.
Here is a phase shift oscillator that works fine:
Here is a phase shift oscillator that works fine:
Attachments
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