I have a set of speakers with MP caps in the crossover and was wondering about the life expectancy. These have a datecode from march of 1977. Should they be replaced?
Regards. Ron.
Regards. Ron.
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sigpicThe Sky Is Falling
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Re: Metallized Paper
No.
Non-Electrolytic caps dont fail over time.
Theres nothing to dry up or fail in similar ways, so these parts will last many decades.
However, if its an old MP capacitor (eg. made before about 1980), it could possibly contain PCBs, which is really bad if it should leak at one day (very dangerous, toxic chemicals). If the cap is in a metal can (cylindrical or rectangular) with sealed contacts, it should say "No PCBs".
Otherwise, it might contain such material, then remove it and replace with the same value of a more recent capacitor, metallized film for example.
Value must stay the same otherwise sound will be different, voltage rating can be larger. You might need parallel connection of several parts to obtain the correct value.
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I'm getting frustrated troubleshooting a paper shredder. The way the shredder normally works is when you turn the power on, nothing happens until you insert a piece of paper. There is an IR shredder in the shredder and inserting the paper breaks the beam and starts the shredder motor. But now the motor runs constantly, even when no paper is inserted. I've replaced the photodiode and the IR emitter. Also the relay makes a nice clicking sound so I assume it is working too. I don't know what else to check. Here's a photo of the circuit board. The red and black wires marked IR - go to the... -
PROBLEM SOLVED
I DIDN'T REALISE MY SMALLEST SOLDERING TIP COULD JUST FIT BETWEEN THESE COMPONENTS.
I MANAGED TO REMOVE THEM WITH NO DAMAGE TO THE BOARD AND I HAVE MY INTENDED END RESULT.
On a Possio PM70 portable fax machine which has a scanner that detects when you push a piece of paper into the scanner slot.
It is these two small (3mm long) components that detect the paper and start the scanner feed motor which pulls the paper into the scanner.
(These are on the circuit board for the keypad and not the main board)
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Hey everybody.
Trying to understand the meaning of ripple-current specs for capacitors, I've seen references to a paper apparently entitled "Ripple Current Confusion", by Kemet. I've found that the links to the paper are broken, and that it doesn't seem to be on Kemet's site.
Can you post that paper or a good link to it?
Thanks. -
Today, I am going to share one of my favorite jam fix tricks that works in nearly every printer.
Things needed to make your tool:
1. A laminating machine (can pay to use one at office supply or package store)
2. some plastic 8"x 11" laminating sheets (8.5 x 14" works as well)
3. some heavy paper (or laminate multiple sheet on top of one another)
You are trying to make a fairly thick laminated 8.5 x 18" sheet. (as pictured)
I am not going to tell you the step by step of making this extended sheet as you can do...
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