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.
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
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
juergenk said:I'm currently using 1000u at the amplifier board and 10000u as charging capacitor after the rectifier
regards
Juergen
might do for you
a bit too much for a simple chip amp
in my book
of course for heavy metal music we may need 20mF!!!
PS. It is NOT anything bad with high voltage rating for caps
In fact, it is good when a cap can take 200-1000 Volts
- a sign of quality. This is true for example for Polypropylene, 2.2 -10uF = input capacitors.
But for electrolytics, power Supply Caps, higher voltage means BIGGER & More Expensive.
So a waste of space and your money.
If a power Supply Cap is rated 10-20 volt above the V+ it is most cases good enough.
For a +/- 40 VDC rectifier bridge (4 diodes) supply
we can use for example 4.700uF/ 50VDC or 4.700uF 63VDC.
Regards lineup
I remember ads from old periodics where Croft mentioned using photo elcos in his best models of preamps;
I have no intention to say that photo caps are better or worse than some "audio" grade ones.......but I really can't imagine worst scenario for one cap use than heavy discharging.......... charging and discharging it 100 or 120 times/sec in ordinary PSU must be piece of cake .........or easy task for them.......
I have no intention to say that photo caps are better or worse than some "audio" grade ones.......but I really can't imagine worst scenario for one cap use than heavy discharging.......... charging and discharging it 100 or 120 times/sec in ordinary PSU must be piece of cake .........or easy task for them.......
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