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Buzzing sound from power conditioner
Buzzing sound from power conditioner
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Old 14th September 2021, 07:59 PM   #31
jean-paul is offline jean-paul  Netherlands
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Correct. Do it good straight away or don't do it at all.
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Last edited by jean-paul; 14th September 2021 at 08:01 PM.
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Old 14th September 2021, 08:20 PM   #32
mwilson is offline mwilson  United States
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Quote:
Originally Posted by jean-paul View Post
Correct. Do it good straight away or don't do it at all.
Alas, I am but a novice so please go easy on me. I will follow all the good advice I've received in this thread, for which I am very grateful, but replacing all at once seems like a big challenge for me. I'm comfortable changing a thing here and there as long as it fixes the problem, but to completely replace components is above my level.

BTW, I tried finding someone local to come and perform this for me, but wasn't successful—I'd gladly pay someone if I could. And unfortunately, due to recent surgery, I cannot lift this unit and take it to a repair shop (it weighs 90lbs, about 40kg or so).
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Old 14th September 2021, 08:22 PM   #33
jean-paul is offline jean-paul  Netherlands
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Aha OK. Then the diodes and a Pana cap. Work with desoldering braid or a pump and as short as possible. If there is someone near you with skills then ask assistance. Don’t make the mistake to solder the diodes or the cap in the wrong direction.

If you remove the small PCB anyone slightly electrical gifted can do it perfectly. If you want it done you can send it to me even. Just the PCB….In any case make pictures before for correct assembly.
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Last edited by jean-paul; 14th September 2021 at 08:41 PM.
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Old 14th September 2021, 09:06 PM   #34
mwilson is offline mwilson  United States
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Thank you! I'll start with the Panasonic cap. And thank you for offering to help with the PCB; I think the big ocean in between us makes it somewhat complicated, but I will look some more for a repair shop willing to make house calls.
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Old 14th September 2021, 09:11 PM   #35
jean-paul is offline jean-paul  Netherlands
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There must be a US member that can do this 5 minute job. Maybe you tell the city you live in and someone is nearby. If unsure better have it done.
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Old 14th September 2021, 09:18 PM   #36
mwilson is offline mwilson  United States
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I'm in South Florida, Lake Worth, happy to pay if anyone reading this is willing to make a house call.
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Old 14th September 2021, 09:22 PM   #37
mwilson is offline mwilson  United States
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I know I've written this before, but once again I really, really appreciate all the help that's been provided to me.

As a side note, reason I've posted on diyaudio is because I've been reading a lot about amps here, especially in the Pass Labs section, and I found it all very educational, even though I'm quite the novice. The engagement level of the community encouraged me to register and start this thread.
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Old 17th September 2021, 12:59 AM   #38
mwilson is offline mwilson  United States
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Update. I'm back home, and took the pcb out of the unit for testing.

The capacitor is Jamicon, and removed from the pcb measures at 44uF. Diodes are all ok.

I connected 120V and neutral via alligator clamps, relay switches and is dead silent. Zero noise. I placed the pcb back into the Furman, turned on, buzz is present. Turned off, I then disconnected then output of the relay, zero noise. Reconnected the load, buzzing back on. It appears that is it, so unsure where to go from here. Pcb and relay on their own are perfectly fine. The relay connects 120V to that large capacitor you can see in the first photo in my original post.

So I took a decidedly mechanical approach here, simply surrounded that pcb with sponge-like shipping protectors to diffuse/absorb the sound emitted, while still leaving some room for ventilation. I no longer hear the buzzing sound. Not happy with the solution but for now it will have to do.
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Old 17th September 2021, 03:52 AM   #39
NareshBrd is offline NareshBrd  India
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It could be a ripple, or that the relay is overloaded.
One more thing, just make sure it is connected to line, if it is a single pole relay.
44 on a 47 rated capacitor is within limits, no problem.
Seems to be that the load or related circuit is causing noise in the relay supply.
Needs thinking over.
Take care the sound absorber is not flammable.
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Old 17th September 2021, 05:22 AM   #40
NareshBrd is offline NareshBrd  India
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If possible, check the DC volts to relay coil in direct and fitted states as above.
It just might be that the supply to the coil is lower or noisier than expected, and that is causing the buzz.
And in quiet on state, and in buzzing state, measure contact resistance.
It still needs some thought...
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