[sdiy] Off the rails

[harrybissell]

Now reverse the +15 and the -15 and see how much they REALLY knew what they
were doing   :^P

(I'm not amazed that loss of one supply was survivable...)

H^) harry

Richard Wentk wrote:

> How much hardware do you know that will survive with one power rail missing?
>
> Due to a severe absence of clue I powered up the laser head I'm modding
> with the -15V line replaced with an open circuit.
>
> Micro - dead. DAC and scanner output - pinned to 15V. Galvo drivers -
> missing in action.
>
> I thought this was going to be a very expensive mistake. But when I figured
> out where the problem was I reconnected the -15V, powered up again and now
> it's all fine.
>
> I'm impressed. The people who designed this thing knew what they were
> doing. :-)
>
> Richard