Converting cordless devices

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  1. - 8th June 2014, 22:58 #4
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    Default Re: Converting cordless devices

    Current on this seemingly mild motor spikes at 4.5A on power-up, settles quickly at 1.5A during operation (without resistance).

    A 12V 7Ah battery turns it plenty fast, worried to hurt gearing.

    12V from a PC power supply turns it a bit slower but still too much. I wanted to use a 7808 but they seem to have a max of 1.5A, I need an 8V source than can handle a 5A spike.

    (Googling for 8V NiCD batteries)

    Robert


    Edit: the LM338 can operate at 5A from 1.2-32V with a 7A peak. I'm kinda worried of running a 7808 at 1.5A for an extended period.

    The other thing I can think of is a MOSFET controlled by PWM from a PIC.
    Last edited by Demon; - 8th June 2014 at 23:18.
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