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Date: 11/01/03 at 8:16 PM
Posted by: Russ Kincaid
E-mail: russlk-nospam[AT55]yahoo.com (replace [AT55] with @ to reply)

In Reply to: designing of single tuned amplifier circuit posted by saravanan on 11/01/03 at 9:27 AM:

For the center frequency: F0=1/2/PI/(L*C)^.5

Q = 2*PI*(energy stored)/(power dissapeted per cycle)

Q = 2*PI*F*(energy stored)/(power dissapation)

Q = F0/BW

energy stored = (1/2)*C*V^2

Depending on the losses in the coil and capacitor, you will have to put a resistor in parallel with the L-C tank to obtain the desired Q.
Put a resistor in the emitter circuit of the amplifier transistor that is 1/50 of the impedance of the L-C tank circuit.

I designed a circuit using a program that can be downloaded from my website: http://www.geocities.com/russlk.
I will email the circuit to you.

Russ

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