Hi !!! I am asking a question about a Large speaker (s) that my son would like to repair. I am praying that some one here can help me. I DO NOT have the speakers or my son in front of me. BUT, I do know that he says he needs some capacitors for these speakers....Now for the description::: They are large (like 3x3 large), they are Motorola...the name Sonic is on the capacitors, Powerline pat #4864624 25mfd, 100 volt. I believe I need two to four of these for him. They are older speakers but since they are Motorola I think they are worth fixing. If anyone can help me I would appreciate it!! Thank you Mary-Kay
3x3 = large whats?
cm, ", mm, feet, ?
25mfd 100volt should read 25micro Farad 100Voltdc = 25µF 100VoltDC or 100 WV ( for working volts)
But these are not large.
Could 25mfd = 25 milli Farad = 25000µF? I doubt it, these would be enormous @ 100V
Modern capacitors come in E3, E6 and E12 ranges.
Very few are available in E24 range, but they tend to be expensive.
25uF could be bought from a speaker component specialist. (25 is not an E24 value).
or
could be made from a 22uF || 3u3F = 25.3uF (22 & 3.3 are both E6 values)
or
10uF||10uF||4u7F = 24.7uF
cm, ", mm, feet, ?
25mfd 100volt should read 25micro Farad 100Voltdc = 25µF 100VoltDC or 100 WV ( for working volts)
But these are not large.
Could 25mfd = 25 milli Farad = 25000µF? I doubt it, these would be enormous @ 100V
Modern capacitors come in E3, E6 and E12 ranges.
Very few are available in E24 range, but they tend to be expensive.
25uF could be bought from a speaker component specialist. (25 is not an E24 value).
or
could be made from a 22uF || 3u3F = 25.3uF (22 & 3.3 are both E6 values)
or
10uF||10uF||4u7F = 24.7uF
Last edited:
uhm, well, I say 3x3 feet I just know I cannot pick them up easily. I had him write down everything it said on the capacitors and the speakers. this is what he wrote....powerline pat #4864624 sonic 25mfd 100 v ... then when I asked what mfd was he said microfad. That is all I can say except he says they are motorola. does this help you at all?
You could get away with 2 x 47uF in series with the loose tolerances on electrolytics.
Crossover caps are normally non-polarised so the back-to-back series option will get over that issue.
Crossover caps are normally non-polarised so the back-to-back series option will get over that issue.
I did post a reply...But I am not sure where it went lol. Anyway, they are about 3foot x 3foot large..what my son wrote down was exactly this..Motorlola powerline pat#4864624 sonic 25mfd 100 volt ...when I asked him what mfd was he replied microfad. I know I woulld have a hard time picking these up. The capacitors seem to be about a half (half to one whole) inch long. Does this help? Thank you for trying! He says the speaker is older...he thinks it was usually used on the stage (???)
25uF 100V @ ~16mm diameter and ~25mm long would be about right.
the dims could be +-50% depending on type and manufacturer.
Do they state bi-polar, or non polar, or do they have a "-ve" marking (a white or silver stripe on a black background) on them?
the dims could be +-50% depending on type and manufacturer.
Do they state bi-polar, or non polar, or do they have a "-ve" marking (a white or silver stripe on a black background) on them?
KatieandDad, I am TOTALLY not into electronics (brain doesnt work anymore)`so keeping that in mind, can you tell me in layman terms (with links or pics) what you just said? sorry
read as one line.....a-25, non polar, 100v. that is all it says on it.....and they are about an inch long.
Last edited:
He needs a non-polar, or a bi-polar, electrolytic capacitor with a value of 25uF and with a working voltage of 100V.
Or a set of electrolytics that can be wired in parallel that add up to 25uF.
Or a set of electrolytics that can be wired in parallel that add up to 25uF.
well
Well, I certainly appreciate all the information. I would order them right now but I cannot find them on the DIY audio website, what the heck am I doing wrong. I am going in circles. Every time I click on the left side I get no pics an/or order info. I am not computer illiterate, this is ......tiring. anyway, thank you all. I may be back, have a wonderful day.
Well, I certainly appreciate all the information. I would order them right now but I cannot find them on the DIY audio website, what the heck am I doing wrong. I am going in circles. Every time I click on the left side I get no pics an/or order info. I am not computer illiterate, this is ......tiring. anyway, thank you all. I may be back, have a wonderful day.
Agreed, they will be close enough.
Hi Mary-Kay. The diy store is not really set up for parts. Depending on where you are, you might have a local store you can stop in at or maybe order them online from a place that's not too far away.
Hmmm...if the IP locator is correct, you don't live in a big city so these may have to be ordered online, but I would check around anyway.
Thank you Jerwluwoo, I got them ordered.. Cal, IP is correct, I am in the middle of NOW WHERE lol..
AndrewT, I ordered 22uhf at 100 v's. I hope that is good, should I do more? the order is already placed. But thank you for all of the information. TTYL!!
By the way, I might have to work on an older ham radio (solid state? with crystals or tubes), will this forum come in handy?🙂
Try Solen MKP capacitors, i just recapped a vintage pair of speakers that had some oddball size caps like 6uf and 16uf.
e.g. Solen 25.00uF 400V DC FastCap Polypropylene Audio Capacitor from Falcon Acoustics, the leading supplier of diy hifi components.
e.g. Solen 25.00uF 400V DC FastCap Polypropylene Audio Capacitor from Falcon Acoustics, the leading supplier of diy hifi components.
SHIZOD you must make sure that you use the correct polarity of capacitor.
A standard electrolytic has a +ve and a -ve terminal and must be connected in the correct polarity or it might explode.
You can get non-polarised electrolytics which do not have a +ve or -ve end and can be connected both ways round. These are common in crossovers.
You can make a non-polarised capacitor out of two polarised capacitors by connecting them in series. ie connecting the two +ve terminals together and using the series combination by using the two -ve ends. You need two capacitors of 47uF 63V in series to make 25uF 120V. The central +-+ connection must be insulated and not connected to anything.
A standard electrolytic has a +ve and a -ve terminal and must be connected in the correct polarity or it might explode.
You can get non-polarised electrolytics which do not have a +ve or -ve end and can be connected both ways round. These are common in crossovers.
You can make a non-polarised capacitor out of two polarised capacitors by connecting them in series. ie connecting the two +ve terminals together and using the series combination by using the two -ve ends. You need two capacitors of 47uF 63V in series to make 25uF 120V. The central +-+ connection must be insulated and not connected to anything.
- Status
- Not open for further replies.