Replacing capacitors on PCM, need clarification
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Logistics Pro
Joined: Mar 2005
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From: Mexico, Missouri
Replacing capacitors on PCM, need clarification
Just trying to get some capacitors replaced, and it looks like the "Notorious" 63v, 10uf cap is the one that no one carries. What has anyone swapped or interchanged this capacitor with?
I tried Radio Shack and they only have up to 50v, 10uf. Everyone else is empty and has to be ordered.
I appreciate all info as I can't find one place in 50 miles that has or carries it!!
I tried Radio Shack and they only have up to 50v, 10uf. Everyone else is empty and has to be ordered.
I appreciate all info as I can't find one place in 50 miles that has or carries it!!
Senior User
Joined: Jan 2015
Posts: 286
Likes: 1
From: NoVa
^^^ What wag53 said. ^^^
you can probably find it cheaper if you look around, but shipping usually kills the deal on these little parts.
(http://www.digikey.com/ is always good in my book)
you can probably find it cheaper if you look around, but shipping usually kills the deal on these little parts.
(http://www.digikey.com/ is always good in my book)
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
While it's kind of a kluge, in a pinch capacitors can be wired in parallel. Electrically it makes no difference. The voltage rating stays the same, the capacitance is doubled. They can also be wired in series, the voltage rating is doubled, tho the capacitance is halved. In fact if you disassemble the large high voltage electrolytics, this is how they are made.
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Logistics Pro
Joined: Mar 2005
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From: Mexico, Missouri
Thanks gents for the help.
Wag53, I briefly looked up Calibration Technologies before I left the house. Never heard of them nor that they deal with Gas detection. I didn't really see anything pertaining to capacitors, but saw small electronic boards meant for detection use. I will give them a call in the morning. I'm only 37 miles from Columbia. No biggie. I checked Sedalia, but nothing there or the couple of small repair shops in Columbia.
Thanks again for the help!
So another dumb question. You said wiring in series doubles the voltage, but cuts the capacitance in half. So could one take two caps and just solder the ends together and essentially make one?
Wag53, I briefly looked up Calibration Technologies before I left the house. Never heard of them nor that they deal with Gas detection. I didn't really see anything pertaining to capacitors, but saw small electronic boards meant for detection use. I will give them a call in the morning. I'm only 37 miles from Columbia. No biggie. I checked Sedalia, but nothing there or the couple of small repair shops in Columbia.
Thanks again for the help!
So another dumb question. You said wiring in series doubles the voltage, but cuts the capacitance in half. So could one take two caps and just solder the ends together and essentially make one?
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
Just trying to get some capacitors replaced, and it looks like the "Notorious" 63v, 10uf cap is the one that no one carries. What has anyone swapped or interchanged this capacitor with?
I tried Radio Shack and they only have up to 50v, 10uf. Everyone else is empty and has to be ordered.
I appreciate all info as I can't find one place in 50 miles that has or carries it!!
I tried Radio Shack and they only have up to 50v, 10uf. Everyone else is empty and has to be ordered.
I appreciate all info as I can't find one place in 50 miles that has or carries it!!
Use the 10uF 50V capacitor and you will be good.
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Logistics Pro
Joined: Mar 2005
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From: Mexico, Missouri
That's good news to know I can use the 50v 10uf.
Though I could still run in series with say 2x35v 20uf, and be in great shape.
Though I could still run in series with say 2x35v 20uf, and be in great shape.
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Senior User
Joined: Jan 2015
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From: NoVa
Thanks gents for the help.
Wag53, I briefly looked up Calibration Technologies before I left the house. Never heard of them nor that they deal with Gas detection. I didn't really see anything pertaining to capacitors, but saw small electronic boards meant for detection use. I will give them a call in the morning. I'm only 37 miles from Columbia. No biggie. I checked Sedalia, but nothing there or the couple of small repair shops in Columbia.
Thanks again for the help!
So another dumb question. You said wiring in series doubles the voltage, but cuts the capacitance in half. So could one take two caps and just solder the ends together and essentially make one?
Wag53, I briefly looked up Calibration Technologies before I left the house. Never heard of them nor that they deal with Gas detection. I didn't really see anything pertaining to capacitors, but saw small electronic boards meant for detection use. I will give them a call in the morning. I'm only 37 miles from Columbia. No biggie. I checked Sedalia, but nothing there or the couple of small repair shops in Columbia.
Thanks again for the help!
So another dumb question. You said wiring in series doubles the voltage, but cuts the capacitance in half. So could one take two caps and just solder the ends together and essentially make one?
I am an electrical engineer, but haven't done much with low frequency analog circuits in many a year other than fixing stuff like you're doing. That said, I would not recommend arbitrarily substituting a capacitor with a lower voltage rating. Chances are that cap was selected on price and has way more margin than it needs, but lowering the voltage rating of the capacitor only takes away from that margin. You'd be fine with a higher voltage rating. YMMV
BTW, I did find lots of 10uF caps rated for 63V at DigiKey for $3 each, but shipping will probably cost $3 -$5.
Finally, pay attention to the polarity of the cap when you install the new one. Good luck!
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Logistics Pro
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From: Mexico, Missouri
Yeah, gas is expensive, and my truck only gets around 11-12 mpg.
I looked at both Mouser and Digikey and saw the selections for both. I just didn't realize NO ONE didnt have 63v or higher...wow I said!!! I actually ordered years ago from Mouser for computer caps I replaced due to the junk Green Taiwan capacitors that flooded the computer board manufacturers and they started leaking, bulging, and eventually blowing a few years done the road.
I actually wanted to work on this on my weekend off cuz I find it fun and the weather is suppose to be great.
Thanks for your knowledge! I'm going to call Calibration Technologies here in a bit.
I looked at both Mouser and Digikey and saw the selections for both. I just didn't realize NO ONE didnt have 63v or higher...wow I said!!! I actually ordered years ago from Mouser for computer caps I replaced due to the junk Green Taiwan capacitors that flooded the computer board manufacturers and they started leaking, bulging, and eventually blowing a few years done the road.
I actually wanted to work on this on my weekend off cuz I find it fun and the weather is suppose to be great.
Thanks for your knowledge! I'm going to call Calibration Technologies here in a bit.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Yeah, gas is expensive, and my truck only gets around 11-12 mpg.
I looked at both Mouser and Digikey and saw the selections for both. I just didn't realize NO ONE didnt have 63v or higher...wow I said!!! I actually ordered years ago from Mouser for computer caps I replaced due to the junk Green Taiwan capacitors that flooded the computer board manufacturers and they started leaking, bulging, and eventually blowing a few years done the road.
I actually wanted to work on this on my weekend off cuz I find it fun and the weather is suppose to be great.
Thanks for your knowledge! I'm going to call Calibration Technologies here in a bit.
I looked at both Mouser and Digikey and saw the selections for both. I just didn't realize NO ONE didnt have 63v or higher...wow I said!!! I actually ordered years ago from Mouser for computer caps I replaced due to the junk Green Taiwan capacitors that flooded the computer board manufacturers and they started leaking, bulging, and eventually blowing a few years done the road.
I actually wanted to work on this on my weekend off cuz I find it fun and the weather is suppose to be great.
Thanks for your knowledge! I'm going to call Calibration Technologies here in a bit.
Newark element14 | Electronic Components Distributor
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Logistics Pro
Joined: Mar 2005
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From: Mexico, Missouri
Well at the moment, Calibration technologies hasn't panned out. Had 50v 10uf, 100v 22 if...
He said that the engineers would be in around 1 and they could perhaps have something that isn't on the shelf.
For grins, I opened my SD '92 PCM and saw it has a 63v 3.3 if capacitor!!! I almost got excited until the "3.3uf".. I guess I'm gonna have to order some of these and quit tryingbto scavenge from the local towns.
Thanks everyone for you help!!
He said that the engineers would be in around 1 and they could perhaps have something that isn't on the shelf.
For grins, I opened my SD '92 PCM and saw it has a 63v 3.3 if capacitor!!! I almost got excited until the "3.3uf".. I guess I'm gonna have to order some of these and quit tryingbto scavenge from the local towns.
Thanks everyone for you help!!
Senior User
Joined: Jan 2015
Posts: 286
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From: NoVa
In my experience, electronic components almost never fail for electronic reasons. They fail for mechanical reasons - broken leads, cracked cases, failed materials, etc. Often this is from age degradation of polymers, overheating or from shock and vibration. In the case of re-using a cap from an old board, I'd be concerned that the heat of desoldering adds undue stress to an already old component. Not saying it can't be done, but...
Interesting aside: The Chinese have whole cities of people desoldering components from old boards. They then sand off the old markings (electronic components) and screen print on new markings. Occasionally they will re-mark a consumer component as a MIL-SPEC component and resell it at an enormous markup. This is a *big* concern to the DoD when they try to repair 20+ year old hardware.
The Hidden Dangers of Chop-Shop Electronics - IEEE Spectrum
https://www.federalregister.gov/arti...eit-electronic
Postmaster
Joined: Nov 2011
Posts: 3,533
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From: SW Florida
Not any worse than buying a "reman" computer or distributor from your local friendly-but-unknowledgeable auto parts store. Except when it endangers people, of course.