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Old 3rd June 2007, 06:49 PM   #1
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Default "photo" Caps & audio circuits ?

Hi all,
While working on a GC and digging thru my rapidly growing parts, bin I found a couple of caps that are labeled "photo". These are 120mfd @ 330V.
Are these useful in audio circuits?
TIA


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Old 3rd June 2007, 08:18 PM   #2
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Photoflash caps are designed for high discharge rates, and I've seen admonishments not to use them for regular cap service. I don't know why not, as they seem to perform the same as a conventional cap of the same value and voltage. Anybody know of a reason to avoid them?
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Old 3rd June 2007, 09:40 PM   #3
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An example: http://www.capacitorindustries.com/web/CD17S.htm ... note that these "photo flash" types are special purpose electrolytic capacitors and may be of only slight value for DIY audio ... but experimentation may be in order.
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Old 3rd June 2007, 10:00 PM   #4
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Conrad & F-Eddy,
Thanks for the replies...
In an effort to keep moving forward, I've left a terminal strip in the PSU section to facilitate easy CAP experimentation. I will
er-uhhhh ...test them



Onward,

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Old 4th June 2007, 04:50 PM   #5
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Seven, what I've heard is that in normal service photoflash caps are charged all the way up, then completely discharged; this once a minute or so, episodically. They are designed and constructed uniquely for this odd sort of service. Put in a power supply, where they are charged most of the way up and then partially discharged and recharged sixty times a second, their service life will be very short.

If you're looking for very good, very economical electrolytic caps, have a look at Panasonic ED, TSHA, TSHB at Digi-Key. I have found nothing better, and I have A-B'd them with the heavy hitters.

Aloha

Poinz
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Old 4th June 2007, 05:53 PM   #6
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Mahalo P-Dexter,
Seeing your location makes me think I should fly out for a personal A-B test

I'll follow your advice on my next order... I have a handful of chips and a Big trafo, but still need to decide on a project. Hmmmmmm


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Old 4th June 2007, 06:00 PM   #7
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hm, I find the values to small to be useful in a chipamp design
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Old 4th June 2007, 06:24 PM   #8
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... mine are; 120mfd 350v.

Maybe I'll make a flash


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Old 4th June 2007, 06:36 PM   #9
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yes, with 120uF/350V you can't do much exept flashes
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Old 4th June 2007, 06:41 PM   #10
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Juergen,

How big are you guys using? The original schems I've seen are calling for about 1KuF as the last tank, which looks pretty small to me. 18v into an 8 ohm load is 3 amps, which is going to drain a thousand mic cap pretty quickly.

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Poinz
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