Hi,
Iwas hoping someone could confirm the results I have for a Wien Bridge Oscillator Circuit?
The objective is to calculate a suitable value for Resistor 2 (see attached circuit), so that the circuit oscillates (sinusoidally). R1 = 100kΩ.
Vout = 0.4v. No other information is provided.
My attempt is as follows:
Vout = 0.4v; x 1/3* = 0.132v (Vin)
Amp Gain A = Vout/Vin = 0.4v/0.132v = 3.
Aβ must equal 1 when the phase shift equals 0 degrees. For maximum output voltage.
Therefore β = 1/A = 1/3 = 0.33v.
To find the value of R2:
β = R1/R1+ R2 where β =0.33v and R1 = 100kΩ.
Re-arranging;
R2 = (100kΩ/0.33v)-100kΩ = 203kΩ.
Questions:
*my understanding from my study material that this is a 1/3 of the Vout. I have also seen this as Vout is 1/3 of Vin???
Also can anyone confirm that my working is sound?
Thanks for your time.
Iwas hoping someone could confirm the results I have for a Wien Bridge Oscillator Circuit?
The objective is to calculate a suitable value for Resistor 2 (see attached circuit), so that the circuit oscillates (sinusoidally). R1 = 100kΩ.
Vout = 0.4v. No other information is provided.
My attempt is as follows:
Vout = 0.4v; x 1/3* = 0.132v (Vin)
Amp Gain A = Vout/Vin = 0.4v/0.132v = 3.
Aβ must equal 1 when the phase shift equals 0 degrees. For maximum output voltage.
Therefore β = 1/A = 1/3 = 0.33v.
To find the value of R2:
β = R1/R1+ R2 where β =0.33v and R1 = 100kΩ.
Re-arranging;
R2 = (100kΩ/0.33v)-100kΩ = 203kΩ.
Questions:
*my understanding from my study material that this is a 1/3 of the Vout. I have also seen this as Vout is 1/3 of Vin???
Also can anyone confirm that my working is sound?
Thanks for your time.
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