ORIGINAL MESSAGE:
On Fri, 09 Apr 2010 03:18:24 +0000, Ron Youvan
<ka4inm@tampabay.rr.com> wrote:
>
> I can not follow this tread to it's originator, but:
> I had a sub-assembly fail a week or two ago and the problem was a 39 k Ohm
> 2 Watt resistor (one
>of two) had burned it's self DOWN to 30.09 OHMS and the increased current
>burnt up a 470 Ohm at 2
>Watt resistor. The other 39 k Ohm 2 Watt resistor was not so effected.
> The 39 k Ohm 2 Watt resistors and a 1 k Ohm 1/2 Watt resistor (for each)
> drop (+ and -) 170 Volt
>supplies (divide by 40) into a comparator (each) and detect power supply
>failures.
>In operation since May 2002.
REPLY:
It is well known that resistors can and do decrease value, but for
some reason Carl said they do not. I'm still waiting for an
explanation from him.
73, Bill W6WRT
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|