# frequency of oscillators

Discussion in 'Homework Help' started by aprajita_aparna, Nov 6, 2007.

1. ### aprajita_aparna Thread Starter New Member

Sep 2, 2007
2
0
hello everyone,
could someone plz help me to know dat how do we get the frequency of rc phase shift oscillator as 1/(2*pi*R*C*(6)^.5).
and also how do we get B=1/29.
and colpitt oscillator give frequency of 1/(2*pi*(L*C)^.5)?
could some one explain it or give me some hint to find it out

2. ### recca02 Senior Member

Apr 2, 2007
1,211
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if u are an engg student this is something you can easily find in the course books,
the derivation of those is a little too large to type for any member here and the explanation is going to be more or less same.
perhaps you can post your problems in understanding something specific in those derivations.

3. ### aprajita_aparna Thread Starter New Member

Sep 2, 2007
2
0
thanx.
i searched n got a bit of explanation on d net.books dint hav it.

4. ### The Electrician AAC Fanatic!

Oct 9, 2007
2,300
335
Have a look here for an explanation of the phase shift oscillator derivation. The derivation given is for the series R/shunt C case. I'm sure you can see how to modify it for the series C/shunt R case.

http://www.crbond.com/papers/ent23.pdf