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Old 21st October 2005, 03:48 AM   #1
rkc7 is offline rkc7  United States
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Default Capacitor voltage in PSU

I'm thinking about building an amp and looking into sourcing parts for my power supply.

I was going to use the T-amp from 41hz.com, AMP1B, with a 22v toroid for a 30vdc supply. Anyway, I'm looking for some filter caps and I found a few seemingly good deals on Ebay, but I have a problem. Would it be unwise to use 35vdc capacitors for this supply since it is so close to the operating voltage?

Reason is that I found these caps:
http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA%3AIT&rd=1

They look pretty nice and would suit my needs well, except for the voltage rating.

Any opinions on their usage or even quality are welcome!
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Old 21st October 2005, 08:01 AM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
I don't know the regulation of your transformer but guesstimating at 10% will give an idling voltage of about 34Vdc. To this you need to add the overvoltage allowed from the mains which can be another 6% to 10% above rated incoming AC voltage.

40Vdc caps would be better, however 63V are readily available and relatively cheap.
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Old 21st October 2005, 02:51 PM   #3
rkc7 is offline rkc7  United States
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I figured 40vdc caps would be the minimum, from what I've read... but I'm not an expert on this matter, so I figured I'd ask.
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Old 21st October 2005, 03:21 PM   #4
Apex Jr is offline Apex Jr  United States
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Default Cap deals

I have a deal on 3 types of caps that might work.
12,000 UF 35V 2 for $1.00
10,000 UF 63V $ 1.50ea
12,000 UF 50V $ 1.29ea
Everyday prices, only problem is I have a $20.00
minimum order...Toroids, RCA Jacks and binding posts
All these are listed on my website www.apexjr.com
Steve
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Old 21st October 2005, 04:31 PM   #5
rkc7 is offline rkc7  United States
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Thanks Steve, actually I had been looking around your site already and saw those!
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