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Old 6th September 2013, 11:06 PM   #11
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Quote:
Originally Posted by Hikari1 View Post

You have read this? This will answer a lot of your questions.

http://www.diyaudio.com/.../build-gu...1.0.pdf‎
Please fix this link.
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Old 6th September 2013, 11:40 PM   #12
brunk is offline brunk  United States
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OK I have read the PDF, thanks for that by the way. However, I'm still confused on what value resistors for the snubber caps to use.

Here's the PSU caps I'll be using.

The snubber caps i chose were off the BOM .1uf 100VDC

The toroidal im using will be a SumR 400VA 115/230V Primary with 2x 18V secondaries.

I believe all i have left to figure out is what value snubber caps and resistors to use and what lengths of wire for PSU and signal then I'll be good to order. So anyone that can help with that would be much appreciated. Thanks fellas!

Last edited by brunk; 6th September 2013 at 11:51 PM.
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Old 7th September 2013, 12:13 AM   #13
brunk is offline brunk  United States
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Would anyone see a problem fitting this Antek 500VA toroidal in the deluxe 4U chassis? It's much cheaper than going with my previous choice.
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Old 7th September 2013, 12:55 AM   #14
Hikari1 is online now Hikari1  United States
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Should work. It's only .5 inch larger than the 400VA transformer used in the build guide.
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Old 7th September 2013, 02:01 AM   #15
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Snubber caps and resistors are for Advanced Newbies only, so leave them out until you can tune their values to your transformer secondaries.
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Old 7th September 2013, 02:15 AM   #16
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Quote:
Originally Posted by brunk View Post
OK I have read the PDF, thanks for that by the way. However, I'm still confused on what value resistors for the snubber caps to use.

Here's the PSU caps I'll be using.

The snubber caps i chose were off the BOM .1uf 100VDC

The toroidal im using will be a SumR 400VA 115/230V Primary with 2x 18V secondaries.

I believe all i have left to figure out is what value snubber caps and resistors to use and what lengths of wire for PSU and signal then I'll be good to order. So anyone that can help with that would be much appreciated. Thanks fellas!
Your caps seems spot on get 60.000uF+ pr rail
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Old 7th September 2013, 02:18 AM   #17
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but is it a snubber PSU?
you can also use a standar PSU with the PI filter. and a 2.2uF bypass cap pr rail. and 2.2Kohm 3W bleeder resistor.
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Old 7th September 2013, 02:49 AM   #18
jdkJake is offline jdkJake  United States
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For your jfets, spencer can be contacted through his storefront:

Store | FET Audio
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Old 7th September 2013, 02:57 AM   #19
brunk is offline brunk  United States
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Quote:
Originally Posted by AudioSan View Post
but is it a snubber PSU?
you can also use a standar PSU with the PI filter. and a 2.2uF bypass cap pr rail. and 2.2Kohm 3W bleeder resistor.
Hmm, I'm looking at the PDF link posted earlier on page 3 of the Universal PSU and it shows it can accommodate 4x 35mm caps on C12-C15, but when i go to the store and view the layout it appears it doesn't have those connectors for the 35mm. Could someone verify this as i'm quite confused lol. Does that mean I need to buy 8x 15,000uf 35mm caps instead of 4x 33000uf, or should i get 8x 30mm caps?

Do i install the bleeder resistor with the bypass cap, on the underside or something?

Thanks again for the support.
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Old 7th September 2013, 02:59 AM   #20
brunk is offline brunk  United States
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Quote:
Originally Posted by jdkJake View Post
For your jfets, spencer can be contacted through his storefront:

Store | FET Audio
Thanks for the link, I'll keep it for reference just in case mine come out to be fakes even though the seller said they are originals.
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