Need Explanation "Crystal Oscillator" - Electronic Circuits Projects Diagrams Free

Ayne · 16th October 2006, 11:53 AM

Below is a circuit,
I need explanation that how it start to oscillate.
Plz tell me step by step procedure.

audioguru · 16th October 2006, 05:42 PM

A small amount of noise from the transistor or resistors or just the "click" from power being applied gets amplified by the transistor and is phase-shifted 180 degrees by the crystal and its two capacitors, causing the feedback to be positive. The positive feedack is at the frequency passed by the crystal and keeps the oscillation going.

Ayne · 16th October 2006, 06:27 PM

Thanks audioguru .

what the crystal gives 180 degrees Phase Shift???

Hero999 · 16th October 2006, 06:35 PM

Any crystal operating at its resonant frequency.

I sense one of these 20 questions threads comming on.

Ayne,
Asking questions is good but many of the ansers and be found by reading articles this this article, so please read it before asking any more questions.

audioguru · 16th October 2006, 06:36 PM

Didn't you read about crystal oscillators in Google? There are many articles that explain the phase-shift from a crystal in an oscillator.

I forgot to say that the transistor is an inverting amplifier that provides the other 180 degrees phase-shift. So the total amount of phase-shift is 360 degrees.

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16th October 2006, 11:53 AM	#1
Ayne	Need Explanation "Crystal Oscillator" Below is a circuit, I need explanation that how it start to oscillate. Plz tell me step by step procedure. Attached Thumbnails

16th October 2006, 05:42 PM	#2
audioguru	A small amount of noise from the transistor or resistors or just the "click" from power being applied gets amplified by the transistor and is phase-shifted 180 degrees by the crystal and its two capacitors, causing the feedback to be positive. The positive feedack is at the frequency passed by the crystal and keeps the oscillation going. __________________ Uncle $crooge

16th October 2006, 06:27 PM	#3
Ayne	Thanks audioguru . what the crystal gives 180 degrees Phase Shift???

16th October 2006, 06:35 PM	#4
Hero999	Any crystal operating at its resonant frequency. I sense one of these 20 questions threads comming on. Ayne, Asking questions is good but many of the ansers and be found by reading articles this this article, so please read it before asking any more questions. __________________ I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer. Last edited by Hero999; 16th October 2006 at 07:57 PM.

16th October 2006, 06:36 PM	#5
audioguru	Didn't you read about crystal oscillators in Google? There are many articles that explain the phase-shift from a crystal in an oscillator. I forgot to say that the transistor is an inverting amplifier that provides the other 180 degrees phase-shift. So the total amount of phase-shift is 360 degrees. __________________ Uncle $crooge