Power Supply Caps

izzy wizzy · Post by **izzy wizzy** » Sun Jan 09, 2011 2:27 pm

I'm after some cheap power supply capacitance @ 1000V min for my 813 PP amp.

I have 2 470u 500V BHC jobbies and would add another pair to obtain 235u @ 1000V for the other channel at a cost of about £50 but they're awaiting delivery for ages already at Farnell and who knows how long that will be.

Looking at Rapid shows Samwha computer grade electros and I could get 3 1000u, 400V for 333u at 1200V x 2 for both channels at about £50.

Does anyone here have experience of the Samwha brand?

Does anyone have any better ideas? Currently I have 3 220u, 400V caps for 73u at 1200V and I reckon I'm a bit light on capacitance. PSUD suggests about 5V ripple with choke input. 235u gets me about 1.5V and 333u gets me about 1V ripple.

Or what are people's opinion about doing something like 2 470u 400V in parallel and then 3 of these bunches in series for 313u @ 1200V using cheaper snap in caps?

Schemo here: http://www.izzy-wizzy.com/audio/powamp813elin.html

cheers,

Stephen

pre65 · Post by **pre65** » Sun Jan 09, 2011 2:59 pm

e-bay can be a good place, but very time consuming sometimes.

How about something like these ? You would need three though which would give you 733uf. I like those BHC Aerovox caps.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... _500wt_715

Post by **Nick** » Sun Jan 09, 2011 3:15 pm

Its takes time, but I series/parallel'd 70 220uf 50v caps to give 150uf @ 1000v, sounded very good as well. The price of a big bag of caps makes it relatively cheap as well.

izzy wizzy · Post by **izzy wizzy** » Sun Jan 09, 2011 8:41 pm

Good idea Philip but I want something sooner rather than later. I do like the BHC range of caps.

And it's good to hear Nick, that a multiple series/parallel arrangement won't be too bad. Ideally, I try to avoid paralleling up caps but in this case, I may have an exception.

Back out to the shed

cheers,

Stephen

Andrew · Post by **Andrew** » Sun Jan 09, 2011 8:51 pm

I can vouch for the series/paralleled solution, it certainly didn't seem to hold Nick's amp back in anyway.

Andrew

Greg · Post by **Greg** » Sun Jan 09, 2011 8:59 pm

Looked impressive too

al newall · Post by **al newall** » Sun Jan 09, 2011 10:55 pm

Meanwhile............. to answer your question, Samwha seem to be quite good.
I've used them quite a bit. No problems so far.

izzy wizzy · Post by **izzy wizzy** » Mon Jan 10, 2011 7:47 am

Thanks Al. Looks like I have a bunch of options to get the other channel going,

cheers,

Stephen

jack · Post by **jack** » Tue Jan 11, 2011 9:15 am

izzy wizzy wrote:I'm after some cheap power supply capacitance @ 1000V min for my 813 PP amp.

I have 2 470u 500V BHC jobbies and would add another pair to obtain 235u @ 1000V for the other channel at a cost of about £50 but they're awaiting delivery for ages already at Farnell and who knows how long that will be.

I have quite a few new 2200uF 500V RIFA (PEH169ZV422KM) & EPCOS ( B43584A-S6228-M4) - they came from unused & dismantled UPS systems that we got rid of - I intercepted them before they went to WEEE - they've been in equipment, but never used in anger and are pristine - http://4hv.org/e107_plugins/forum/forum ... post_86986 . The EPCOS are black and the RIFAs white. They are chunky monkeys...

Whilst most of these are allocated to an HV project (I also do railguns/Tesla coils etc.), I could let a few go at a reasonable price. Drop me a PM.

Edit: Several other values available too, e.g. 1000uF @400vdc RIFA PEH169VK410KQU2 and 1400uF @ 385vdc RIFA PEH200XH414AMU2 (these are NIB).

Edit: They would need gentle reforming as they've been in my workshop for a couple of years.

Cheers

audio-talk

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