> Al Clark <firstname.lastname@example.org> writes:
>>I still call powering up a circuit the first time, the smoke test.
>>Its been a long time since one actually smoked (they don't always work,
>>but they tend to be a lot more benign).
> When I was tutoring 1st year engineering labs, by far the biggest
> mistake students had made when they said "it doesn't work" was to
> leave the power supply off.
> I _know_ it's bad, but I used to shout <BANG> when they turned the
> power supply on. :-)
> And nine times out of ten, everything worked. There were just two
> times I remember anything "letting the smoke out". Once it was an
> electrolytic capacitor that went <BANG> and the other time the
> students got some diodes to glow faintly red... and they we'ren't
> SUPPOSED to be LEDs.
> Peter K.
I had a coworker for a while who could make a perfect 120-cycle buzz,
loudly, just like a piece of power electronics about to go up in smoke.
I think if we hadn't been doing stuff that was all DC we would have
dragged him out and shot him...
Wescott Design Services
Reply by Joerg●December 17, 20052005-12-17
> I had a coworker for a while who could make a perfect 120-cycle buzz,
> loudly, just like a piece of power electronics about to go up in smoke.
> I think if we hadn't been doing stuff that was all DC we would have
> dragged him out and shot him...
This was from the days when smoking was still allowed in labs: Engineer
drinks coffee. Nature calls. While engineer is at the ceramics
department someone shoves a screw cap with a not-quite-extinguished butt
under the prototype. Engineer comes back. Smoke billowing out of
prototype. Engineer panics and rips all supplies off.