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Question about constant current source.

Hardware design
July 15, 2020 by Hanna 338

Ask you, how to understand this circuit, what role does the previous Q1 transistor play?

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Phoenix Posted on July 15, 2020

From the circuit point of view, it is similar to that of the amplifier to adjust the input current of the base of Q2. But is there any practical application of this circuit?

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Kira Posted on July 15, 2020

If you use 1V voltage is wrong, (1-0.7)/45.3=6ma, but your display is only 3ma, indicating that the voltage is not enough.

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Alina Posted on July 15, 2020

This circuit cannot complete the function of constant current, and changes greatly when the voltage changes.

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