whit3rd wrote:
On Friday, May 22, 2015 at 9:27:21 AM UTC-7, wrote:
The discussion ...jogged
my memories of the Polyswitch, a protective device whose resistance
jumps up when sufficiently heated (via current), but goes back down
when it has cooled off.

http://www.te.com/usa-en/products/ci...e-devices.html

We ended up not using them, but now I am curious if they show up in
damaged equipment.

Yes, there were quite a few damaged polyswitches in the 1990's vintage
SCSI (computer bus) systems; these were used in powering the required
resistor arrays (called terminators), and were a big improvement over
the previous generation (which used fuses).

Eek. I forgot about resistor packs and termination until you brought it
up. ESDI drives needed proper termination as well. That stuff was a pain.