Re: Subwoofer Power Supply Problem
I usually suggest Panasonic FM's from Digi-Key, but I think someone said the FC's, while not as low ESR nor high ripple, are made in a fashion that they withstand heat better than the FM's or last longer, something like that.
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Re: Subwoofer Power Supply Problem
As these were General Purpose, low ESR won't hurt. You just don't have to go crazy and get super low.
Go with 105°C caps. I'd also replace the other 4 small caps on that board.
Find someway to ventilate the space to the outside, even if it is by convection.Leave a comment:
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Re: Subwoofer Power Supply Problem
I had searched the internet and could not find any information on the capacitors. When I called technical support at Onix (subwoofer manufacturer), they did not know either and did not have the service manual since the sub was discontinued.
So, thanks jpdoe for finding this information on the REC capacitors for me. I see in the data sheet that ripple current for my capacitors is 925mA, however it does not state what the esr values are for the capacitors. Should I be looking for low esr capacitors ?
The subwoofer is a sealed design (non ported). Also, the plate amp does not have any vents, it fits inside the sub's cabinet in a sealed hard plastic box, isolating it from the speaker. Now I am concerned about the heat build up and I would like to know if its safe to stay with a 85C capacitor ?
These are the electronic retailers that I will be using to purchase the replacement caps
http://ca.mouser.com/search/Default.aspx
http://dkc1.digikey.com/ca/digihome.html
http://www.e-sonic.com/acc/home.aspxLeave a comment:
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Re: Subwoofer Power Supply Problem
Here's the datasheet, for someone more experienced than me on finding replacements.Leave a comment:
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Subwoofer Power Supply Problem
I purchased the subwoofer 'Rocket ULW-10' around 2005 and recently was experiencing a humming noise coming from the sub. So I researched the problem on the internet and it was suggested on various forums that this could be a capacitor issue.
After checking the audio source and for grounding issues, I then decided to open up the subwoofer plate amplifier. What I discovered was that 2 of the capacitors on the power supply board were blown.
The 2 capacitors had the following specifications:
'PEC' or 'REC' , SR , 1000uF , 25V , 85C
Now I am assuming from looking at the power supply that it is a linear design and not switch mode design.
What would be a good replacement for these capacitors ?Attached Filesif you find these attachements useful please consider making a small donation to the site
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I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow
This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board
After all of... -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi all, I just need to know that, can i use SMPS type power supply to test and short circuit detection on a laptop motherboard?
I saw 95% of repair guys are using only Linear bench power supply. linear bench power supply is pricy, thats why i planned to get one SMPS supply.
i know that in linear power supply the noise will be very low comparing to SMPS supply.... -
Good day.
I have an AC/DC -> DC PWM (rectifier + 555 buck converter) power supply with MDF11n60, which is getting very hot.
The input is AC from a transformer and the output powers a 24v dc fan. The power supply is used to regulate the speed of the fan.
After several runs on the bench power supply I noticed that the mosfet is reaching 80+C*. The mosfet reads fine on component tester, the thermal paste is changed, the fan is cleaned and with freshly oiled bearings.
When powered directly from the bench psu, the fan takes ~0.7A on 12V. The current consumption is similar...
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