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Old 6th August 2009, 02:20 AM   #1
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Default Toroidal transformer for F1

I'm searching for a high grade transformer for an F1 build. I'm considering a Plitron but am not sure which one to use. Ideally I'd like to install something rated around 650 volts. Any suggestions would be greatly appreciated (especially if you have a certain transformer in mind). The more specific the better. Thank you in advance.
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Old 12th August 2009, 01:18 PM   #2
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bump. please help.
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Old 12th August 2009, 02:19 PM   #3
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What do you mean, 650 volts?

Do you mean 650 VA?

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Old 12th August 2009, 06:44 PM   #4
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yes
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Old 12th August 2009, 07:22 PM   #5
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You don't (necessarily) need 650VA, and Plitron doesn't offer one with 18V secondaries in their standard range.

Try:

http://www.plitron.com/shopping/shopexd.asp?id=162

300VA Power Transformer
Output: 2 X 18VAC @ 8.33A

Check out this article for a primer on transformer sizing and other good stuff:

http://www.passdiy.com/pdf/zenlite.pdf
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Old 13th August 2009, 04:02 AM   #6
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Thank you for the advice. Is it problematic to stray from these specs: 2 X 18VAC @ 8.33A? This seems like a good option. I'm going to keep looking for the time being but may end up doing this.
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Old 20th August 2009, 05:46 AM   #7
toufu is offline toufu  United States
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Quote:
Originally Posted by milezone View Post
Thank you for the advice. Is it problematic to stray from these specs: 2 X 18VAC @ 8.33A? This seems like a good option. I'm going to keep looking for the time being but may end up doing this.
I have been using Antek 2 x 18V 400VA transformers for my Pass clone builds. So far I have built Aleph 30 and F5 with them without any problems.
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Old 24th September 2009, 09:23 AM   #8
Lucas_G is offline Lucas_G  Netherlands
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I live in the Netherlands and there are not so many options for transformers to use in the F5.

RS Components sells some excellent 18 V AC trannies that are shielded and dead quiet. However the maximum they offer for 18 V AC is 225 VA.

http://nl.rs-online.com/web/search/s...duct&R=2238825


I guess that is not really enough for two channels F5.

My intention is to build a stereo amp that uses 2 F5 in parallel per channel, so 4 F5 amps for a stereo amp. I also use the CViller PSU boards.

My question to the more experienced:

Can I use two of these 225 VA trannies to feed one PSU board that will feed 2 F5 amp boards, without running into trouble with hum or sound degradation? (Of course I would be forced to use the outputs of the trannies in parallel and use one for the positive rail and one for the negative rail).

Or is it neccesary to use two PSU boards for one channel? That would make 4 PSU boards for the stereo amp, and since I want to use chokes (CLC instead of CRC) that would require 8 chokes, which calls for a lot of space and money!
Or is this the preferred route?

Please can some expert give me advice?

Thanks!


Lucas
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