Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Power Supplies and Power Supply Design
Register FAQ Calendar Search Today's Posts Mark Forums Read

Thread Tools Display Modes
Old Today, 12:34 PM   #21
PeteS in CA
Badcaps Veteran
PeteS in CA's Avatar
Join Date: Aug 2005
City & State: San Jose, CA
My Country: USA, Unsure of Planet
Line Voltage: 120VAC, 60Hz & 115VAC, 400Hz
I'm a: Professional Tech
Posts: 2,878
Default Re: Dell model L275E-01 pn: Wu142. Optiplex 755 small form factor.

Originally Posted by stj View Post
it's getting pretty common in europe now to bypass hot thermisters with a fet/triac or relay just to save "something" or reduce heat output.
we are under the thumb of the scum that are obsessed with carbon!!
While I won't disagree with your assessment of the enviros, improving efficiency of PSUs in a big server-storage farm can improve the farm's electric bill, so to speak.

Shorting out the inrush thermistor also allows use of a higher value thermistor that cannot sustain the normal continuous current: the inrush is lower in magnitude; the thermistor gets shorted out before it desolders itself or blows up. I saw the latter usage back in 1980 in which a simple wirewound panel mount resistor was used; the resistor did not survive long if the triac failed to fire, .
PeteS in CA

Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.

Where might is right
There is no right.
- Sophocles in "Antigone"
All that is gold does not glitter,
Not all those who wander are lost;
- J.R.R. Tolkien, The Fellowship of the Ring
To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
PeteS in CA is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump Technical Forums 2003 - 2019
Powered by vBulletin ®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 07:06 PM.
Did you find this forum helpful?