How to Build a Simple BJT Differential Amplifier with a Gain of 20?

AI Thread Summary
To build a simple BJT differential amplifier with a gain of 20, users suggest starting with a basic circuit design that incorporates two transistors, Q1 and Q2. Some participants recommend simplifying the circuit by replacing the transistors with resistors to achieve the desired gain. Discussions emphasize the importance of component selection and configuration for optimal performance. Participants also share tips on troubleshooting common issues encountered during assembly. Overall, the thread provides practical advice for constructing an effective differential amplifier circuit.
alexfung1992
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Does anyone know how to build a simple BJT Differential Amplifier circuit? And also need to gain around 20..emergency please help. Thanks for that.

As I build a circuit but is not simple enough, please have a look for that and any comment for this circuit?
CurrentMirrors_x2.png
 
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Try replacing Q1 and Q2 with two resistors.
 
phyzguy said:
Try replacing Q1 and Q2 with two resistors.

I see, thanks a lot
 

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