Westport Lights Posted February 9, 2011 Share Posted February 9, 2011 This board is part of a power supply unit for a early 80's lighting control board. It has a piece that's blown and I'm trying to repair. Can anyone tell me what the little green things are? They have 10+ 35V+ printed on them. I'm thinking capacitors, but want verification before I get one and solder it in. Attached files Link to comment Share on other sites More sharing options...
Denis Chaput Posted February 9, 2011 Share Posted February 9, 2011 I don't think their capacitors as the two black ones are capacitors . Do you have a board number and try googling it to find a schematic might be woth a try. Link to comment Share on other sites More sharing options...
Caleb Linburg Posted February 9, 2011 Share Posted February 9, 2011 It could be a resistor i found this picture of a resistor that looks kinda like it. Attached files Link to comment Share on other sites More sharing options...
-klb- Posted February 9, 2011 Share Posted February 9, 2011 It is not uncommon to have tantalum or ceramic caps in parallel with electrolytic caps. The reason is that the electrolytic ones have a fairly high effective series impedance that limits how quickly they can react. The tantalum or ceramics can't smooth as large a transient, but they can react much faster.Looks like that is a power supply card, with a couple of voltage regulators in series, each with their filter capacitor, in addition to an initial set off the rectifier, or other inlet source. If you just remove the damaged cap, things should still operate OK on a temporary basis. If not, you likely have further damage. Link to comment Share on other sites More sharing options...
Alan C Posted February 9, 2011 Share Posted February 9, 2011 I agree. It is likely it was a tantalum capacitor. Ceramic capacitors tend to just crack rather than fail explosively. You will need to get the new one the correct way round, otherwise it will do it again.Regards,Alan. Link to comment Share on other sites More sharing options...
Westport Lights Posted February 9, 2011 Author Share Posted February 9, 2011 Thanks so much for the replies.Yes, it is a power supply card. The unit still functions fine, but I'm worried that damage will be caused if it's not replaced in the long run. I'll remove the old one right away.Should I be look for a tantalum capacitor then or a newer style electrolytic? Any ideas where to find one or what size/spec is needed? 10+ 35v+ is marked on it. Does that mean it's 10uF 35v+ ? Link to comment Share on other sites More sharing options...
Dennis Cherry Posted February 9, 2011 Share Posted February 9, 2011 That is a tantalum capacitor.It is probably 1 or three on the board. Yes they will explode like that some times.It is probably the same capacitor as the other two on the board.Get another one in the same values just like other two and watch the polarity when installing, Tantalum's will explode if reversed, they are polarity sensitive. Link to comment Share on other sites More sharing options...
bisquit476 Posted February 10, 2011 Share Posted February 10, 2011 Shoot on down to the local Radio Shack with the board in hand, they may have them in stock, or be able to order. You could also check mouser.com, newark.com, or any other supply house. Good luck Link to comment Share on other sites More sharing options...
Bob VandenBoom Posted February 10, 2011 Share Posted February 10, 2011 Westport Lights wrote: Thanks so much for the replies.Yes, it is a power supply card. The unit still functions fine, but I'm worried that damage will be caused if it's not replaced in the long run. I'll remove the old one right away.Should I be look for a tantalum capacitor then or a newer style electrolytic? Any ideas where to find one or what size/spec is needed? 10+ 35v+ is marked on it. Does that mean it's 10uF 35v+ ?Probably 10uF and 35volt. The + is the polarity. Make sure when replacing the + side goes in the same hole they came out of. Link to comment Share on other sites More sharing options...
Rafter Bar R Posted February 12, 2011 Share Posted February 12, 2011 Caleb Linburg wrote: It could be a resistor i found this picture of a resistor that looks kinda like it.The green ones are often inductors. Link to comment Share on other sites More sharing options...
Guest guest Posted February 13, 2011 Share Posted February 13, 2011 Thats definitely a tantalum cap in this case..across each of the larger filter caps. Should be a lot of flexibility as far as value, but if you have a confirmed value for 1, safe to assume they are all the same.Does Radio Shaft even keep small parts like that in stock anymore? Link to comment Share on other sites More sharing options...
Westport Lights Posted February 13, 2011 Author Share Posted February 13, 2011 The local Radio Shack doesn't have them, but I bought a few online, they should be here later this week. Thanks for the input everyone. Link to comment Share on other sites More sharing options...
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