3 transistor amplifier

191

01:51:40

I actually built this circuit today and the measured gain was around X70,  here it is a little higher at X84. The current source was made with a J113 jfet and a 100R resistor. If you require a higher input impedance I have a Darlington buffer circuit that can be used at the input.

Update 20-6-17: Have increased the power supply to 24 volts and adjusted the bias conditions accordingly, the voltage gain is now over 100.

published 8 years ago

jpoulin0901

8 years ago

How did you implement the current source in the real version?

gasboss775

8 years ago

Sorry, I forgot to mention that. I used a J113 N Ch Jfet and a 100R resistor.

spacewig

4 years ago

if you change 68k resistor in series with 10uF cap from collector/drain of 1st transistor to base of 2nd trans from 68k to 6k you get gain of 2000

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