On Feb 21, 2011, at 6:27 PM, Phill Harvey-Smith <[email protected]> wrote:
> On 22/02/2011 00:12, Dave Park wrote: >> On Feb 21, 2011, at 2:02 PM, Tony Firshman<[email protected]> wrote: >>>> And, have a good insulating backing plate, because there's nothing worse >>>> than 40 amps of 12V shorting onto something metal in the case, or worse, to >>>> something on a PCB... >>>> >>> Oh yes there is - a wet tongue. >> >> Oh really? Wet tongued heal. Fried QLs do not self-repair. ;) > > Though prolly not if they've had 40A @ 12V (480W) through them....... > > Mind TBH, if I where powering QL+addons from an ATX I'd prolly put > apropreatly rated fuses in the cables between PSU and computer, after all the > sorts of currents that an AT/ATX PSU can supply could under fault conditions > cause the QL board to catch fire without ever over strainging the PSU...... > > Common misconception: fuses are there to prevent shocks, they're not they're > there to melt/blow and break the circuit before it can become damaged / catch > fire. Indeed. It is always best to ensure a weak point in the circuit is one you can replace for less than 50p. Dave. _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
