Replacing the last power supply cap
- Thread starter adamct
- Start date
That could be a terminal, or just a mounting stud, but the datasheet you linked to isn't very specific. It would seem reasonable that the bottom stud is not connected internally, especially since this is a motor run cap.
-PB
-PB
Thanks. Here is a picture. I think I'll buy a couple and try them out...
Just to confirm: it is OK to replace the 220uf electrolytics in the power supply with 200uf film caps, right? Would a 250uf cap be better?
Best,
Adam
Just to confirm: it is OK to replace the 220uf electrolytics in the power supply with 200uf film caps, right? Would a 250uf cap be better?
Best,
Adam
Paul Joppa
Moderator
The ebay listing says 420vDC but the data sheet says 420vAC. The data sheet says metalized but does not say what is metalized - polyester, polypropylene, dried snot, kleenex, who knows?! The maximum 5kHz frequency makes me suspect it might not be polypropylene - not clear why you "now know it is ..."?!
Sorry, I'm just a suspicious SOB. It's cheap, give it a try - the worst that can happen is a blown fuse, and a REAL Bottlehead buys them by the gross at Costco! :^)
Sorry, I'm just a suspicious SOB. It's cheap, give it a try - the worst that can happen is a blown fuse, and a REAL Bottlehead buys them by the gross at Costco! :^)
I found this data sheet, which shows they are polypropylene. I agree it is odd that the data sheet doesn't mention the DC rating, but the label on the cap itself does show a DC rating (you can see it if you enlarge the picture in the eBay listing). The seller confirmed that they aren't motor start caps.
Well, I've now got four of them on the way to me. Worst comes to worst, I can add them to my growing collection of unsuitable 200uf caps. I recently received a call from a dealer in Miami, who said he had an eccentric client with a pair of mint, 200uf metalized Kleenex caps available for the right price. Apparently these are fairly unusual, since they still have pieces of vintage snot on them. I'm afraid I won't be able to resist that siren song. The second mortgage on my house should be approved any day now, and then those caps WILL be mine!
Paul Joppa said:
Hey PJ,
If I roll you some copper foil/kleenex caps and pot them in mineral oil, can I put them in your BeePre?
So the 200uf Icar caps arrived today.
THEY.
ARE.
MASSIVE!!!
We will see how they perform, but they make me laugh just looking at them. Here is my question: the terminals are massive bolts with chunky nuts that screw onto them. I'm trying to envision myself soldering leads onto there, and I just don't see it happening. I've got to believe my soldering iron would just lie down and call "Uncle". Any advice? Should I try it anyway? Or do you think I can/should just wrap the stripped tip of the lead onto the terminal and cinch down the bolt? Is a physical connection enough here?
I'm cautious about attempting to solder leads on, as I don't want to get solder in the terminal threads and thereby render it impossible to screw a bolt on if I need to.
Pictures to follow when I get a chance...
Best,
Adam
THEY.
ARE.
MASSIVE!!!
We will see how they perform, but they make me laugh just looking at them. Here is my question: the terminals are massive bolts with chunky nuts that screw onto them. I'm trying to envision myself soldering leads onto there, and I just don't see it happening. I've got to believe my soldering iron would just lie down and call "Uncle". Any advice? Should I try it anyway? Or do you think I can/should just wrap the stripped tip of the lead onto the terminal and cinch down the bolt? Is a physical connection enough here?
I'm cautious about attempting to solder leads on, as I don't want to get solder in the terminal threads and thereby render it impossible to screw a bolt on if I need to.
Pictures to follow when I get a chance...
Best,
Adam
Rob
Just so I understand, what is the benefit of doing it that way? Isn't that essentially the equivalent of wrapping the lead directly around the terminal? The copper wire you soldered the leads to is just physically connected to the terminal right? Or have I misunderstood?
Thanks,
Adam
Just so I understand, what is the benefit of doing it that way? Isn't that essentially the equivalent of wrapping the lead directly around the terminal? The copper wire you soldered the leads to is just physically connected to the terminal right? Or have I misunderstood?
Thanks,
Adam
Paul Joppa
Moderator
You guys do know that then make terminals, right? Look like washers with a solder tab on one side? There are some in our kits, for instance the safety ground lug. Hardware stores have them. :^)
Similar threads
