15 Nov
2004
15 Nov
'04
5 a.m.
>>>> "Tore" == Tore S Bekkedal
<Tore> writes:
> If the supply has a "crowbar overvoltage
protection" circuit in
> it, that's a different matter.
Tore> This PSU is rugged and has
"Voltage OK" lights on all the
Tore> voltage lines. It is according to a man who is knowing,
Tore> incredibly sturdy and used with defense systems all over the
Tore> country.
"Incredibly sturdy" is nice. But that doesn't translate into "cannot
ever fail".
"Voltage ok" may mean there's a crowbar, or it may only mean there is
a voltage monitor. Those are very different things. Voltage monitors
wouldn't protect you against a regulator short.
Tore> But access to a complete array of spares if nessecary. Oh, and
Tore> the CPU is built in TTL logic, so no hard-to-get spares.
TTL is getting hard to find, especially the more obscure types such as
74S series. (And if the book says they want 74S, it's quite possible
no other variant will work...)
paul