Universal PSU, Capacitor and Diode Combination Board (V2) - Page 8 - diyAudio
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Old 17th June 2013, 03:30 AM   #71
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Default Small capacitors

I'm building a F5 using the diyAudio Universal Power Supply Boards.

I have a question about two capacitors in the circuit:

1) In the Nelson Pass power supply circuit he uses a .0033uf cap in parallel across the mains. I've been doing some reading and I believe this is for emi/rfi suppressing. The question is what type (material) and ratings does this cap need to be?

2) On the power supply board C17 and C18, part of the snubber circuit. BOM says .1uf 63-100v. Again what type (material) would be best?

Thanks,
Kevin
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Old 17th June 2013, 05:09 AM   #72
Electrons are yellow and more is better!
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A big improvement of the BOM would be to have a more detailed specification of each part and also article numbers from some of the big distributors like Mouser, Farnell etc.

The 3.3 nF cap should be a cap approved for X-type applications, normally polyester.

C17-C18 , polyester is fine.
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Old 24th June 2013, 01:25 PM   #73
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Now that the boards are going (or being) into production could we kindly have some more details concerning mounting specs of the board?

Thing is I'd like to start building and would like to be able to plan the implemantation of the boards before receiving them.
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Old 25th June 2013, 09:05 PM   #74
Jason is offline Jason  Australia
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We'll publish a full physical diagram shortly.

The cap board has four holes in the middle in an 80x80 square, which allows it to be attached to the back of the new Deluxe chassis front panels as a single or dual PSU, or on the perforated base, or on risers either attached to the base, or perpendicular to the front, or flush with the front, mounted up or sideways or... hard to explain but we'll have diagrams galore when I get a moment to make them.

All other holes on the cap and diode section are on the new 10x10 grid pattern, so again you can attach them to the base, front or risers and spun around in any orientation.

Full mounting specs coming soon...
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Old 26th June 2013, 03:42 PM   #75
Jason is offline Jason  Australia
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Mechanical diagram attached and also added to the store images.
Attached Images
File Type: png psu-v3-mechanical-diagram-2.png (144.0 KB, 163 views)
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Old 3rd July 2013, 07:07 PM   #76
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I pre ordered several Universal Power Supply Boards and am trying to collect and order my parts. I was planning on using TO247 diodes with heatsinks. The board has an outline of a heastsink. Is there a part number or designation for a heatsink that fits the board.

Thanks.

dante
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Old 26th November 2013, 04:53 PM   #77
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Default Beginner Question

This may seem a simple question to those in the know but I am trying to figure out how to connect the transformer to the diode boards.

I have a 49v-0-49v transformer (one for each channel), so three wires coming out of the secondary two red one yellow. How do I connect these to the diode board, AC1A, AC1B and AC2A, AC2B?

Simple answer please.
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Old 26th November 2013, 05:25 PM   #78
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Wire 0 = your ground
The other ones shall go to AC1A and AC1B. You can't use two rectifier bridge with a center tap transformer. You must have two separate secondary windings if you want to have two rectifier bridges.
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Old 26th November 2013, 09:15 PM   #79
ncg2013 is offline ncg2013  United Kingdom
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Quote:
Originally Posted by peranders View Post
Wire 0 = your ground
The other ones shall go to AC1A and AC1B. You can't use two rectifier bridge with a center tap transformer. You must have two separate secondary windings if you want to have two rectifier bridges.
oh! looks like I need to get new transformers!
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Old 27th November 2013, 05:07 AM   #80
Jason is offline Jason  Australia
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Quote:
Originally Posted by dante550 View Post
I pre ordered several Universal Power Supply Boards and am trying to collect and order my parts. I was planning on using TO247 diodes with heatsinks. The board has an outline of a heastsink. Is there a part number or designation for a heatsink that fits the board.

Thanks.

dante
Check the UMS - http://www.diyaudio.com/forums/image...ation-v2.1.pdf

The only pre-drilled pre-tapped heatsinks we sell are the ones in the Deluxe Chassis:

Full width with 40mm Heatsinks - Chassis
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