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'AW: [EE] Ticking power supply'
2010\04\16@100808 by Peter Feucht

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Hi,

My tip for localizing the clicking: Use half a meter of PVC hose, outer
diameter 6mm or so, stick one end into your ear and you can touch the most
dangerous (hot, high voltage) spots with the other end. Works like a doctors
stethoscope...

Peter



-----Ursprüngliche Nachricht-----
Von: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu [.....piclist-bouncesKILLspamspam@spam@mit.edu] Im Auftrag von
Matt Callow
Gesendet: Freitag, 16. April 2010 15:16
An: Microcontroller discussion list - Public.
Betreff: [EE] Ticking power supply

Hi, I have a fanless power supply for my mediacentre PC which has started to
make a ticking noise (5~10Hz i would guess).
It seems to get worse as the PSU heats up. I took the PSU apart and noticed
that one of the inductors was no longer cemented to the circuit board, so I
re-glued it. When I plugged it back in, all seemed good  - until is warmed
up. Then the ticking started again!
Does anyone have any suggestions as to what else I could check to see what's
making the noise within the PSU?

Mat

2010\04\16@101150 by Peter Feucht

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Yes, first fix the non existent fan... *smile*

Peter


-----Ursprüngliche Nachricht-----
Von: piclist-bouncesspamKILLspammit.edu [.....piclist-bouncesKILLspamspam.....mit.edu] Im Auftrag von
Olin Lathrop
Gesendet: Freitag, 16. April 2010 15:28
An: Microcontroller discussion list - Public.
Betreff: Re: [EE] Ticking power supply

Matt Callow wrote:
> Hi, I have a fanless power supply for my mediacentre PC which has
> started to make a ticking noise (5~10Hz i would guess).

Could be the fan going bad.


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2010\04\16@105400 by Dr Skip

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It's obviously a complex power supply, with real AND imaginary components... ;)

For the real ones, try a wooden chopstick or light plastic rod and lightly
press/touch components. You should be able to feel the tick with a light enough
touch, or with a little pressure, alter or stop the sound. The alter/feel/stop
result will also depend on what type of component it is, but that should get
you close.

A finger in a thin rubber/neoprene glove would work for the less risk averse,
trying not to touch obvious HV bare metal, just component covers.

For sounds too faint for the chopstick, or perhaps the hose, a small mic
element on the end of stick and amplified to headphones would be an improv
stethoscope. One could even glue a chopstick to the mic element and touch
components, creating an electronic "mechanic's stethoscope"...

Whatever you use, you may have to turn it 90 degrees to hear the 'fan'... ;)

-Skip

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