Can I connect a wiper through a laptop power supply?
Good afternoon. For personal purposes, use the wiper motor. His rated voltage is 12 volts. I want to temporarily poke it with a laptop power supply. But it has an output of 20 V. Is it really possible for them to energize the engine or is it better to fasten a dimmer / PWM? I'm not good at electrics.
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Hello! You can power it. From a short-term inclusion, most likely, nothing will happen to him. Note that it can even heat up at rated voltage, you need to check. To reduce the voltage of a laptop PSU, you need to use a PWM dimmer, for example, or a pulsed step-down converter, for example to lm2596. But he has a current from the power of a couple of amperes. You can connect two in parallel, but then the regulating potentiometer is soldered from one and its contacts are soldered to the remaining potentiometer on the second board. This is one of the options.
You can also use the regulator on the NE555 and the field effect transistor. And if you are less or less strong in electronics, you can find the feedback circuit on the laptop and edit it. By the way, it can be assembled on TL431. There is nothing complicated - increasing the resistance of the lower resistor in the harness - you increase the output voltage, and increasing the resistance of the upper - reduce the output voltage.
And what about the current? Are you sure he can stand it? If you are not strong in the above issues, any PWM dimmer is suitable, but it is desirable that it has a rotary regulator, so that you can set the initial voltage, so that there is no such problem as with push-buttons - which, when turned on, can give out 100% voltage until until you lower it.