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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Question on voltage of electrolytic cap
Would it hurt anything to replace an alectrolytic cap (high temp, if that
matters) with one of the same value (220uF) but a higher voltage rating? Seems like it wouldn't, but I thought I'd ask... Thanks, D |
#2
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Question on voltage of electrolytic cap
In article merica,
Dave wrote: Would it hurt anything to replace an alectrolytic cap (high temp, if that matters) with one of the same value (220uF) but a higher voltage rating? Seems like it wouldn't, but I thought I'd ask... No - if there's space for it. They're bigger, like for like. -- *Reality? Is that where the pizza delivery guy comes from? Dave Plowman London SW To e-mail, change noise into sound. |
#3
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Question on voltage of electrolytic cap
"Dave Plowman (News)" wrote in message ... In article merica, Dave wrote: Would it hurt anything to replace an alectrolytic cap (high temp, if that matters) with one of the same value (220uF) but a higher voltage rating? Seems like it wouldn't, but I thought I'd ask... No - if there's space for it. They're bigger, like for like. -- *Reality? Is that where the pizza delivery guy comes from? Dave Plowman London SW To e-mail, change noise into sound. Thank you, Dave. Yeah, the 50V is more than twice the size of the 35V, and may not fit. But it's all I seem to be able to find for that value and high temp. 'preciate it. Dave |
#4
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Question on voltage of electrolytic cap
"Dave" wrote in
netamerica: Would it hurt anything to replace an alectrolytic cap (high temp, if that matters) with one of the same value (220uF) but a higher voltage rating? Seems like it wouldn't, but I thought I'd ask... Thanks, D nothing,if the physical size of the new cap fits in the space of the old cap. Mind your ESR requirements. Switcher power supplies need low-ESR caps. -- Jim Yanik jyanik at kua.net |
#5
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Question on voltage of electrolytic cap
In theory, if the cap has a voltage rating much higher than the actual
circuit voltage (say, a 100V cap in a 50V DC circuit), the capacitor is more likely to deform. That's the theory. I've never seen any systematic study of it. Anyone know "fer shure"? |
#6
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Question on voltage of electrolytic cap
"Jim Yanik" wrote in message ... "Dave" wrote in netamerica: Would it hurt anything to replace an alectrolytic cap (high temp, if that matters) with one of the same value (220uF) but a higher voltage rating? Seems like it wouldn't, but I thought I'd ask... Thanks, D nothing,if the physical size of the new cap fits in the space of the old cap. Mind your ESR requirements. Switcher power supplies need low-ESR caps. -- Jim Yanik jyanik at kua.net Thank you, Jim. Any ideas on how I can determine what the ESR of a cap is? Seriously, I know this matters, but have no idea as to how to apply the question. Maybe Google... Just a thought. 'preciate it. dave |
#7
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Question on voltage of electrolytic cap
"Dave" wrote in
: "Jim Yanik" wrote in message ... "Dave" wrote in netamerica: Would it hurt anything to replace an alectrolytic cap (high temp, if that matters) with one of the same value (220uF) but a higher voltage rating? Seems like it wouldn't, but I thought I'd ask... Thanks, D nothing,if the physical size of the new cap fits in the space of the old cap. Mind your ESR requirements. Switcher power supplies need low-ESR caps. -- Jim Yanik jyanik at kua.net Thank you, Jim. Any ideas on how I can determine what the ESR of a cap is? Seriously, I know this matters, but have no idea as to how to apply the question. Maybe Google... Just a thought. 'preciate it. dave Dick Smith Electronics used to sell an inexpensive ESR meter kit(I have one,love it),Anatek may still carry them. around $50 USD. you could probably look up the manufacturer's specs on their website. -- Jim Yanik jyanik at kua.net |
#8
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Question on voltage of electrolytic cap
"Jim Yanik" wrote in message ... "Dave" wrote in : "Jim Yanik" wrote in message ... "Dave" wrote in netamerica: Would it hurt anything to replace an alectrolytic cap (high temp, if that matters) with one of the same value (220uF) but a higher voltage rating? Seems like it wouldn't, but I thought I'd ask... Thanks, D nothing,if the physical size of the new cap fits in the space of the old cap. Mind your ESR requirements. Switcher power supplies need low-ESR caps. -- Jim Yanik jyanik at kua.net Thank you, Jim. Any ideas on how I can determine what the ESR of a cap is? Seriously, I know this matters, but have no idea as to how to apply the question. Maybe Google... Just a thought. 'preciate it. dave Dick Smith Electronics used to sell an inexpensive ESR meter kit(I have one,love it),Anatek may still carry them. around $50 USD. you could probably look up the manufacturer's specs on their website. -- Jim Yanik jyanik at kua.net Why, *thank you*. Will check out said kit, and Anatek as well. Much appreciated. Dave |
#9
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Question on voltage of electrolytic cap
"William Sommerwerck" wrote in message
. .. In theory, if the cap has a voltage rating much higher than the actual circuit voltage (say, a 100V cap in a 50V DC circuit), the capacitor is more likely to deform. That's the theory. I've never seen any systematic study of it. Anyone know "fer shure"? Yes, the 100 volt electrolytic will eventually become a 50 volt electrolytic (or whatever voltage is actually impressed on it). The aluminum oxide film that is the actual dielectric of the capacitor will hydrolyze eventually dissolving the oxide back into the electrolyte. This is why relatively new electrolytic capacitors sometimes need to be reformed. In most cases, this is seen as an elevated leakage current in the first few hours of operation. In the old days when vacuum tube rectifiers were in vogue, power supply electrolytics would be subjected to a higher voltage than their normal operating voltage until all the tubes were "warmed up". This is why high voltage electrolytics often had a surge voltage rating high enough to prevent breakdown during those few seconds that the supply was not providing current. I wrote a number of posts about 9 to 10 years ago on electrolytic capacitors and their chemistry. Most of these can be found archived at http://yarchive.net/electr/electrolytic_caps.html. Dr. Barry L. Ornitz WA4VZQ |
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