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Old 4th March 2012, 04:28 PM   #41
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Thor Supply CapMultiplier board in progress.

Some component values still not decided as well as the transistors in the capmultiplier but I have a few ideas.

The Cap Multiplier part of the supply circuit will be using a star ground to minimize hum.
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File Type: png Thor-Supply-CapMultiplier-Layout.png (144.2 KB, 363 views)

Last edited by Neutrality; 4th March 2012 at 04:36 PM.
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Old 4th March 2012, 05:21 PM   #42
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I might be interested in a pair of Mk2 amps boards depending on final price.
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Old 4th March 2012, 07:42 PM   #43
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Originally Posted by Avro Arrow View Post
I might be interested in a pair of Mk2 amps boards depending on final price.
Price would be $25 USD for a pair of MKII boards if I ever decide to get some boards made, not totally decided on that just yet.
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Old 5th March 2012, 04:17 PM   #44
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It is not a perfect star but I think it would work quite well anyway.
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Old 5th March 2012, 06:19 PM   #45
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You should just make a polygon and fill that whole area up.
Thats more like a spider than a star
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Old 5th March 2012, 06:23 PM   #46
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Here is an example of a dual rail board I did:

DIY Lab Power Supply
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Old 5th March 2012, 06:56 PM   #47
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Quote:
Originally Posted by Avro Arrow View Post
You should just make a polygon and fill that whole area up.
Thats more like a spider than a star
Haha, yea, it looks like a spider.

However, I'm not sure a ground plane is a good idea for a cap multiplier.

What info I could find suggets a star ground layout for cap multipliers or atleast using something star-like.

But then again that was with nothing else than the cap multiplier connected after rectification, with LM317/LM337 as preregulation it might not be needed.

Last edited by Neutrality; 5th March 2012 at 07:05 PM.
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Old 5th March 2012, 07:03 PM   #48
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Maybe double the thickness of the center trace and end it at C13.
Polygon around the ground connections.
Try and get the other traces to come into the center trace closer together.

Good job on the project so far!
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Old 6th March 2012, 05:04 PM   #49
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Well, think I'm going with a ground plane.

Supply board should be done soon, just have to do a little more simulation and finding the correct transistors and resistor values.

Board should be ordered, mounted and tested some time in the beginning of april if all goes well.
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Last edited by Neutrality; 6th March 2012 at 05:18 PM.
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Old 6th March 2012, 06:59 PM   #50
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Transistors will be BC546/556 or BC547/557 preferably in C grade and BD135/136 or equivalent for the main pass transistor.

Gerber.
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Last edited by Neutrality; 6th March 2012 at 07:14 PM.
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