As title says, can 12V car wiper motor be powered using PC power supply? According to amperage of typical car wiper motor I would say yes, but I want to check :) Thanks in advance
You are probably better off using a somewhat older power supply. At IBM XT times, floppy drives tended to be run on the 12V power supply (at PC times, even the RAMs needed a 12V rail) so the 12V rail is quite capable.
Older power supplies lack any of the modern sensing interlock controls. That means that if you flip the power switch, the power supply will be on. Modern power supplies have a complicated startup procedure including a soft-button, presence detection, minimum load requirements on the 5V rail, et. al. So using an older power supply will make your life easier.
It might also be a good idea to check that your circuitry contains a fly-back diode to keep the motor from trying to feed back power into the circuitry or power supply when switching it off.
That should probably work.
- All matter is correct voltage and the amperage. As usual a PC power supply of 250W wattage can output maximum current around 14A amperes. The maximum output ranges are marked on the power supply according to the voltage range.
- It is safe for the power supply until the motors’ maximum input amperage is below than the maximum output of the power supply. You can switch ON the power supply by connecting the “Green” color wire in the mother board socket with any black color ground wire with a jumper cable. -Make sure to use only “4 pin Molex connectors” or “floppy connectors” to obtain the voltages. Don’t use any mother board sockets pins for that because they have not built for heavy amperage uses.
- I also agree that use of a fly back diode for better safety of the power supply.