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Author Topic: Kenwood PS52 power supply tones!!  (Read 602 times)
9H1FQ
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Posts: 177




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« on: November 29, 2017, 01:14:33 PM »

After some 30 minutes of operation, my PS52, power supply, of my TS850, starts emitting a tone, which ends up like rtty tones! This is a conventional supply, no switching circuits. The only addons are two relays, one for mains soft start and the other, a DC  protect delay to protect the pa driver.

anyone has had this strange phenomena? The psu has no loudspeaker! Its not mains hum by loose xformer laminations. The reciever is very normal, and the tx loads normally, at full power!
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K5LXP
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« Reply #1 on: November 29, 2017, 04:22:29 PM »

Is it the fan squeaking?

Mark K5LXP
Albuquerque, NM
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9H1FQ
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« Reply #2 on: November 29, 2017, 10:39:29 PM »

Pure audio tones?
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An unknown gem of the Mediterranean sea is the Island of Malta. blessed with warm sun , all year round.
In just one day, you can see places which will make you travel in history from the Prehistoric temples throu the middle ages, the Knights of Malta, all the way to world war two. All the major civ
K8AXW
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« Reply #3 on: November 29, 2017, 11:06:43 PM »

Open 'er up and see if you can determine which component is making the noise.  If it doesn't make any noise with the cover off it could be the cover rattling or the  heat build-up being dissipated.

Checking the fan (if it has one) is a good idea at this time.  Another is relay chatter.  This is easy enough to find simply by pushing down on the armature with a pencil.

I can't think of anything else that would make this kind of noise in a linear supply.  You've already eliminated transformer lamination noise.
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AE5GT
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« Reply #4 on: December 04, 2017, 08:01:41 AM »

The regulator may be going into oscillation. Possibly due to capacitors on the input or output circuit. Also i would check the pc board ground / screws. You dont want the  Ref/Grd pin of the regulator "floating". 
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K4JJL
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« Reply #5 on: December 05, 2017, 07:01:40 AM »

You can use a straw as a stethoscope to find the vibrations.  I do this a lot with air conditioners that are making whirring or whining noises to find bad bearings.
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