[Amps] pi-net spreadsheet question

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Fri, 09 Apr 2010 03:18:24 +0000, Ron Youvan
<ka4inm at 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