Current Source for Low Resistance Measurements

Useful for low-resistance measurements, this 1-A current source will produce 1 A in unknown resistance Rx. For best results, Rx should be less than 1 to 2 ohms, because only 3 V are available. U1 is a flyback converter to generate 9 V for U2.

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Current Source for Low Resistance Measurements - Circuitos de Electronica