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Old 11th August 2010, 05:09 PM   #11
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The BOM has too many "Your Choice"

Much confusion between "Hot Rod" and no Hot Rod build, where the Matched jfets are mounted vs unmatched.

The board has too many holes and not labeled as most boards, Building Uriah's

MyRefC or Pass B1 I had no confusion. This Blue Board may not be confusing to most but it is to me.

A Build Manual with pictures would really help.
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Old 11th August 2010, 05:23 PM   #12
Salas is offline Salas  Greece
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The your choice stuff is about parts ''quality'' not values. We can't recommend pricey parts to everybody. It works without electrical differences from generic to ''Rolex''.

There are options between high CCS, low CCS, reg only, full buffer. Matched fets are the quad behind the relay.

Big diodes and big 10W 10R resistors and big heatsinks make it hotrod. Small diodes, 47/47R small resistors, mini heatsinks make it regular.

Tea had a blog I think showing the prototype constructed.

Blue DCB1 is not a kit, its a better board for a very extensively discussed project. Has its options, and its very easy to figure. All builders are happy to explain specifics.
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Old 11th August 2010, 06:06 PM   #13
Tea-Bag is offline Tea-Bag  United States
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I think a point of confusion that will come up is the diodes,
mount only TO-220 or the smaller MUR-120 type. I personally would recommend the TO-220's regardless. About any TO-220 diode will work if being used for a buffer. MUR-860, MSR-860, IXYS has several types that I like.

We also have the addition of the 1R resistors in the supply, which is not on the BOM.
I don't believe they are necessary, and can be jumpered if the offset in power supply is reasonable. Salas can add to this I hope.
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Old 11th August 2010, 07:16 PM   #14
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The only part that threw me off was the 470r resistor that is to be standing. If I had looked underneath the board and looked at the trace it would have made sense.

Salas, I am going for the hot rod version of the build. You just stated in your post above to use 10watt, is the 5watt still applicable?
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Old 11th August 2010, 09:35 PM   #15
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Mouser is out of the MUR120 rectifier diodes (will be in stock by the end of this year!?). Would it be okay to substitute a "fast" rather than "ultrafast" diode with the same ratings? They have plenty of the fast 200V 1amp versions: their part number: 863-1N4935RLG.

Or, if someone can recommend another supplier (in the USA) who might have the little buggers in stock?

Thanx,

Neil
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Old 11th August 2010, 09:54 PM   #16
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How about Digikey?

Digi-Key - MUR120GOS-ND (Manufacturer - MUR120G)
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Old 11th August 2010, 10:57 PM   #17
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Quote:
Originally Posted by ndwalker1 View Post
Mouser is out of the MUR120 rectifier diodes (will be in stock by the end of this year!?). Would it be okay to substitute a "fast" rather than "ultrafast" diode with the same ratings? They have plenty of the fast 200V 1amp versions: their part number: 863-1N4935RLG.

Or, if someone can recommend another supplier (in the USA) who might have the little buggers in stock?

Thanx,

Neil
Why not use MUR860?
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Old 11th August 2010, 11:44 PM   #18
Salas is offline Salas  Greece
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Quote:
Originally Posted by wendell c View Post
Salas, I am going for the hot rod version of the build. You just stated in your post above to use 10watt, is the 5watt still applicable?
5W is OK. 10W I wrote by mistake.
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Old 12th August 2010, 12:26 AM   #19
Salas is offline Salas  Greece
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Quote:
Originally Posted by Tea-Bag View Post
We also have the addition of the 1R resistors in the supply, which is not on the BOM.
I don't believe they are necessary, and can be jumpered if the offset in power supply is reasonable. Salas can add to this I hope.
They are handy resistors so to measure Vdrop across them and translate directly to mA. Having them fitted may be useful indicators in some trimming Vout cases. Not strictly necessary.
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Old 12th August 2010, 12:49 AM   #20
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Quote:
Originally Posted by LucasAdamson View Post
Why not use MUR860?
Or ixys
DSEI12-12A
1.34 each usd@ DK.
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