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Message |
    
Timebomb
New member
Username: Timebomb
Post Number: 2
Registered: 2-2005
| | Posted on Friday, February 04, 2005 - 1:55 pm: | 
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I just picked up a used Samlex 20-25 amp power supply. I've been using it with a RCI2950dx. When I key up, it hums. The more power, the louder the hum. Is this normal?
I've previously only used a 7 amp PS, and wondering if hum is normal in bigger power supplies. Thanks! |
Racer X (Unregistered Guest)
Unregistered guest
| | Posted on Friday, February 04, 2005 - 4:43 pm: |
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I remember seeing those several years ago. I think it's a fairly low profile switching power supply. Is the hum you're hearing a fan that switches on when current is drawn? |
Barracuda
Intermediate Member
Username: Barracuda
Post Number: 284
Registered: 3-2003
| | Posted on Friday, February 04, 2005 - 6:29 pm: |
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I've heard the core plates of power supply transformers hum like that, but usually not in a switching supply (if that's what it is).
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Timebomb
New member
Username: Timebomb
Post Number: 3
Registered: 2-2005
| | Posted on Friday, February 04, 2005 - 7:54 pm: |
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No, it's not one of the switching models. It's a regular model RPS-1220, regulated DC power supply. When I opened it the other night to blow out the dust, I don't remember seeing a fan in there either...thanks for the help. |
Pig040
Advanced Member
Username: Pig040
Post Number: 666
Registered: 7-2003
| | Posted on Saturday, February 05, 2005 - 10:36 am: |
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I had that problem with a Pyramid gold, could not cure it, sold it to a guy to power a rocket launcher, worked fine for him. Now I use only Astrons, no problem, ever!
Good luck with yours,
RIch |
Kirk
Intermediate Member
Username: Kirk
Post Number: 276
Registered: 6-2002
| | Posted on Sunday, February 06, 2005 - 12:15 am: |
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Totally agree with Astron. Luv my 52 amper |
That Elco Guy (Unregistered Guest)
Unregistered guest
| | Posted on Sunday, February 06, 2005 - 11:25 pm: |
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Re Tb...
I found this post on another board in reply to a question in reference to a hum on a power supply.
"Usually when you get hum out of a PS the main filter cap(s) (the larger one(s) across the rectifers output) are bad. You can clip lead another cap of equal or close capacitence and equal or higher voltage across it/them (keep the polarity the same!) for a test. Then replace as needed. At work if I have hum I just replace the main filter and it does the trick. You might want to replace all of the electrolytics in the PS for longer life before further problems."
IF IF IF you try this fix note that use a cap of equal or close value to the original. Secondly replacement cap should have a working voltage of at least the original working voltage or HIGHER.
On a personal experience note when soldering in the new part you will also want to pay very close attention to the polarity of the connections. ONE TIME I connected a polarized cap backwards and it went off like a firecracker--paper all over the place. Ask me if I had egg all over my face?
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Airplane1
Intermediate Member
Username: Airplane1
Post Number: 278
Registered: 5-2004
| | Posted on Monday, February 07, 2005 - 8:24 am: |
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My pyramid PS-42 hums slightly and did from new, I use it hard and for about 8 months now and it still works great.
maybe a slight hum is normal?
airplane |
Pig040
Advanced Member
Username: Pig040
Post Number: 672
Registered: 7-2003
| | Posted on Monday, February 07, 2005 - 10:05 am: |
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Not!! |
Sonny
Junior Member
Username: Sonny
Post Number: 25
Registered: 5-2004
| | Posted on Monday, February 07, 2005 - 6:05 pm: |
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I'v had a Pyramid Gold series PS26k and no hum even using a HD boomer 250 on it, I also run a Diamond GZV4000 THIS IS A VERY GOOD POWER SUPPLY FOR THE MONEY |
