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fixing a camera.

weetsie

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hey, i dont post here much (no money for lasers) but if i remember correctly people here are quite knowledgeable of electronics.

i have a camera that wont power on unless you use completely new 2CR5 6v lithium batteries, once they drop from 6.5V to 6.2V the camera wont power on, a new battery should take thousands of photos but i only get 2-10 depending on the temp.

does such a voltage regulator exist that is small enough to fit in a camera and maintain 6.5V?
 
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Benm

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Yes, it would be possible to build something like this. You could get the shell of a 2CR5 battery, and replace once cell with a CR123 if it fits, or otherwise with a CR2. A boost converter that can supply a few 100 mA would fit in the other half of the battery casing.

It sounds like quite a kludge to get a camera to work though, and it would give you half the original capacity minus losses in the converter. Add to that some mechanism to turn the converter off when not using the camera, and you've got quite the project.
 

mfo

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hey, i dont post here much (no money for lasers) but if i remember correctly people here are quite knowledgeable of electronics.

i have a camera that wont power on unless you use completely new 2CR5 6v lithium batteries, once they drop from 6.5V to 6.2V the camera wont power on, a new battery should take thousands of photos but i only get 2-10 depending on the temp.

does such a voltage regulator exist that is small enough to fit in a camera and maintain 6.5V?
What's the model number of the camera? Post as much info as possible in situations like this so we can get a better understanding. Also, how old is it?
 

mfo

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If you want MY advice, I'd take the camera back for an exchange or refund. rob
Sounds to me like something is corroded or fried, which is causing a massive drain on the batteries. I've never heard of batteries sagging by .3 volts after just 2-10 pictures.
 

weetsie

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its a 20 year old 35mm camera konica hexar AF, i have looked for similar problems but found nothing.

im positive its not a case of the camera draining the batteries too fast as i have tested a new battery on a motor and 10 seconds was all it took to drop the battery down to a steady 6.2v.

i have also had the camera turned on with the multi meter connected and the voltage doesnt dip when you turn the camera on, only when you use the auto focus or shutter as expected.

the camera has a low battery warning and im sure the fault is with that being set to a too high voltage so the camera is refusing to turn on because it thinks there is too little power even though the battery has only been out of the packet 20 seconds.

i really want to get this camera working so removing a cell from the battery and putting something in that will give a constant 6.3v or so will be worth it to me.
 
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