How to simply isolate a pcb from short

Discussion in 'The Projects Forum' started by diono, Jun 24, 2013.

  1. diono

    Thread Starter New Member

    Apr 9, 2013

    I have a pcb in a coffee machine which drives a solonoid from a 24v dc supply. I decided to run the coffee machine with a 24v dc submersible pump inside a canister. The pump shorted, blowing an ic(uln2003A, i think) on the board. I powered the pump off the same supply to the solonoid, as i would need the pump on when the machine switched the solonoid on. How do I protect the ic from another short in the future?

    Many thanks,
  2. GopherT

    AAC Fanatic!

    Nov 23, 2012
    Use a current limiter (a lower power transistor and a higher current transistor - see google or details). Also add a fuse to blow after a few fractions of a second in an over-current situation.