EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: Peabody on September 23, 2020, 02:38:09 pm
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I'm trying to repair a 1980s vintage Vivitar 3500 flash that no longer whines. The electrolytic capacitor in the charge pump circuit measures a good bit of ESR on my scope as compared to other caps I have of the same value. So I need to replace it, but don't know if there's anything special about it. It is tiny - 7mm tall, 4mm in diameter, and has the Matsushita empty-triangle logo, which I assume is now Panasonic. The markings are:
10uF 16V
CE 85C
433B
I can't find a Panasonic CE series on Digikey or Mouser. Of course, as I said, this would be a mid-1980 part. Can someone tell me what this is, and what I should replace it with? I don't understand the circuit, but it involves a transformer and it oscillates in an audible whine that increases in freqency as the main strobe capacitor charges up. This capacitor is just involved somehow in making it oscillate.
Thanks for any info.
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Any modern capacitor that is the same value, same voltage ( or the next higher one of 25V) and which is 105C rated, and which will likely be the same or slightly smaller size will do there, not a critical capacitor at all so long as ESR is low. Brand wise pretty much anything will work, though for longest life a brand like Nippon Chemicon , Nichicon or even Samwah will do as they will fail from other causes, likely seals just rotting away, only after a decade or three. Just stay away from the cheapest models, and in most cases the price for a single capacitor will be less than the shipping cost by a lot, so avoid the Ali and fleabay ones, as they are either cheap, suspect or out and out fakes.