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Question for the electronics wizards

O

Orbison

Well-Known Member
I have an old Nakamichi SR-2A Stasis receiver used for my stereo setup by my computer. It has developed memory problems - it doesn't maintain the preset radio stations assigned after I shut it off. Inside I found a 3 volt coin shaped MnO2-Li battery that apparently has died of old age. Problem is that it can't be replaced due to the fact that it was permanently mounted in a holder that is soldered to the PC board. New batteries are available, but I was unable to find a holder similar to what I need with terminals that I can solder directly onto the PC board.

So, my question is this: can I replace the battery with a capacitor? i.e. the capacitor would charge up when the receiver is on and provide juice to support the memory when it's turned off. If so, any suggestions on the type/size or spec for it?

Or will I just have to run wires from the PC board to a new holder floating above the other parts on the board?

Any input would be appreciated.

Thanks.........
 
I don't believe a capacitor would work and even if it could, I doubt it would be any smaller than the receiver itself.

I have to ask though - what makes you think the battery is permanently mounted? Could it be that some corrosion is bonding it to the contacts and making more difficult to remove?
 
The battery mount consists of 2 vertical strips of metal, each with a "prong" on the bottom soldered to the PC board. At the top, each strip of metal goes to one side of the battery which is positioned vertically between them. I'm not sure how they were attached to each side of the battery - not soldered, more like a spot weld - but I was unable to remove the battery. So I'll have to replace the battery mount.
 
A capacitor will not work. A capacitor is used to quickly prevent short-term changes in voltage a needs a charging circuit. As far as replacing the battery... It doesnt matter what type of holder you use as long as the positive/negative terminals are soldered to the PC board at the right spot. You can mount the battery holder anywhere and use wire to extend the terminals to the PC board.
 
Towen7 said:
A capacitor will not work. A capacitor is used to quickly prevent short-term changes in voltage a needs a charging circuit. As far as replacing the battery... It doesnt matter what type of holder you use as long as the positive/negative terminals are soldered to the PC board at the right spot. You can mount the battery holder anywhere and use wire to extend the terminals to the PC board.
Click to expand...

Yeah, I know how to connect the holder leads to the PC board. I built my first stereo amp from a kit when I was about 13 yrs old and have been fooling around with this stuff ever since, but only on a very basic level. Your comment about needing a charging circuit makes sense, so I'll just get a battery holder. Thanks Towen.
 
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