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Analyze this control relay circuit.

MCU
novembre 27, 2020 by Morris 1120

This is a circuit found abroad. Use two Darlington tubes to control a coil. Let's talk about two diodes D1 (surge protection tr3). What is the function of D2?

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Oriana Posté sur November 27, 2020

D1 and D2 protect TR1 and TR3. When TR1 and TR3 are cut off, the relay discharges through D1 and D2.

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Charisma Posté sur November 27, 2020

Personal opinion: D1, it can be seen, but generally it is not directly led back to the positive end of the power supply, and D2 cannot see how it plays a protective role.

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Gene Posté sur November 27, 2020

Two diodes are equivalent to one diode connected between 4A and 4B.

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