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Multi-tube constant current electronic load

Overview

There are two power supply options for the op amp and cooling fan.
1. Take power directly from the input and supply power after voltage regulation by 7812. It is suitable for inputs between 12.4~35V.
2. Type-c power supply, which has a wider applicable voltage range of 0~60V.
SS56 does not need to be welded. Or you can replace a diode with a higher withstand voltage and input a higher voltage. Of course, the withstand voltage of the MOS tube must also be high enough.
Field effect transistors can be used with greater power dissipation if conditions permit.

This computer CPU fan heater is used for fan heating. The fan heating effect is very good. The key is that the RGB
fan can start and stop automatically. The PWM speed control port of the fan is controlled by the op amp.
There is no waste. The 555 chip used generates adjustable PWM. To control the speed, the potentiometer is in manual gear, or it can be changed to automatic gear. Replacing the potentiometer with an NTC resistor can automatically increase the fan speed when the temperature rises.

Design Files

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Update:2025-05-10 07:34:50

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