icom ps125 whine 50 Lookers and nobody knows??

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N1QOQ
Posts: 23
Joined: Tue Apr 10, 2007 12:28 am
Location: Palmer MA

icom ps125 whine 50 Lookers and nobody knows??

Post by N1QOQ » Sun Nov 25, 2007 4:30 pm

O.k I'm about to use my ps125 as a parts kit. Anybody have a fix for this inncessant high pitched whistle. I'm guessing it's the caps? It drives me nuts.
Its only 2yrs old.

Thanks
Paul :( :(
Last edited by N1QOQ on Mon Nov 26, 2007 10:25 pm, edited 1 time in total.

wa4cch
Posts: 114
Joined: Fri Apr 25, 2003 2:42 am
Location: YULEE FLORIDA

Re: icom ps125 whine

Post by wa4cch » Sun Nov 25, 2007 4:37 pm

n1qoq wrote:O.k I'm about to use my ps125 as a parts kit. Anybody have a fix for this inncessant high pitched whistle. I'm guessing it's the caps? It drives me nuts.
Its only 2yrs old.

Thanks
Paul :?

yea donate it to an old guy like me with a high freqency hearing loss it wont bother me hi hi

73 de chuck :lol:

N9LCD
Posts: 321
Joined: Sat Jul 01, 2006 8:32 pm

Post by N9LCD » Sun Nov 25, 2007 8:34 pm

Paul:

Is the PS125 a switching power supply or is it a linear supply?

Does the power supply emit a whine or is it in you rig's output?

Do you have an o'scope to check the output voltage for ripple?

JERRY

N9LCD

N1QOQ
Posts: 23
Joined: Tue Apr 10, 2007 12:28 am
Location: Palmer MA

Post by N1QOQ » Sun Nov 25, 2007 8:49 pm

I believe it is a switching supply.
The noise is from the supply.
No I don't have a scope.
It varies in intensity, sometimes it stops.
I have read of this before in a post on this board, but with no solution.
I fiqured I would ask some opinions here before I "fixed" it with a hammer.

Thanks for the responce
Paul

N1QOQ
Posts: 23
Joined: Tue Apr 10, 2007 12:28 am
Location: Palmer MA

Post by N1QOQ » Mon Nov 26, 2007 1:25 am

So I got motivated and pulled the ps apart . Now it's been a few years since I took electronics and I don't know every thing (don't tell my wife). But I got a nice tingle off the TOPS of the two 1200uF caps with a reading of158vdc between the two. This does not sound right or do I know less than I think?

Thanks
Paul

wa4cch
Posts: 114
Joined: Fri Apr 25, 2003 2:42 am
Location: YULEE FLORIDA

Post by wa4cch » Mon Nov 26, 2007 3:59 am

N1QOQ wrote:So I got motivated and pulled the ps apart . Now it's been a few years since I took electronics and I don't know every thing (don't tell my wife). But I got a nice tingle off the TOPS of the two 1200uF caps with a reading of158vdc between the two. This does not sound right or do I know less than I think?

Thanks
Paul
:lol: send me that thing quick before you hurt your self :lol:

73 chuck

N4JNE
Posts: 1
Joined: Mon Dec 03, 2007 11:44 pm

Post by N4JNE » Tue Dec 04, 2007 12:11 am

What I remember from science class, in order to produce a sound wave something has to move the air to create the sound wave!

So this is how I find the whine in a switcher. Take to cover off and push on the parts with a insulated stick. When you find the vibrating part, get some glue.

Some times it is a cap. that is making the noise, so just change it.

Or maybe trade it to one of us older guys that have lost our high freq hearing :)

Hope this helps
Gary N4JNE

k9yli
Posts: 226
Joined: Fri Aug 12, 2005 11:35 pm
Location: northwest wisconsin

WHINE

Post by k9yli » Mon Mar 03, 2008 3:42 pm

posting most ly as a test.

Any way. correct. noise needs vibration of something.
"singing" sound can come from transfomrer windings vibrating.

You can get the sticks you need for troublshooting things you dont want to touch with your fingers or a meta tool, get a couple of chopsticks, and also some shish-ke-bob sticks from wally world.
handy to push on relay contacts that may be failing etc.

your problem could be a noisy fan. if it has one.

also save a paper towel roll.

makes an "ear trumpet" to localize sound.

k9yli

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