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Old 1st October 2010, 06:43 PM   #361
opc is offline opc  Canada
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Hi Guys,

Schematic is finalized, and the BOM is finished as well. You can find them both attached below. I've put the parts in as what I would select if I were building this as a "Sensible Audiophile".

The most expensive parts are the polypropylene film output coupling caps at $10 each, followed by the Caddock resistors at $3.50 each. I would imagine many will want to use their own coupling caps, but these fit nicely, and they're what I'll be using.

I'm having trouble sourcing the 400 ohm Caddock MP930 1%, and the DK number on the BOM for that part is made up. 400R is listed on the datasheet as a standard value, so if anyone knows where to get it, let me know. Maybe with a GB we can get all the Caddock parts at once and save a little cash.

Otherwise, all the parts are listed with DK numbers, so feel free to look things up and make comments or suggestions for anything you feel could be improved. $52 resistors are not going on my short list, however.

I took a look at the Linear LT317/337, and they look like they'll drop right in for anyone who would like to spend a little more on regs.

One final issue I'm having is finding any 0.200" pitch inline board to board connectors. I've looked all over Digikey, and I can't find anything. I needs connectors to go between the bottom of the Buffalo II (spacing fixed at 0.200") and the top of my board (also space at 0.200" to match the Buffalo). I don't really want locking ones since it's completely unnecessary for this application. I basically want your standard 0.1" header/socket but with 0.2" spacing. If anyone knows where to get these I would appreciate it! I need a 2 pin, 3pin and 5pin version, although the 5 pin could be replaced with a 2 pin if needed.

Cheers,
Owen
Attached Files
File Type: pdf OPDAC FINAL.pdf (113.8 KB, 756 views)
File Type: pdf OPDAC BOM.pdf (32.7 KB, 525 views)

Last edited by opc; 1st October 2010 at 06:52 PM.
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Old 1st October 2010, 07:05 PM   #362
qusp is offline qusp  Australia
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they arent 52 anywhere sensible. they are 14 singly normally and thats ridiculous, I did a full double take when I saw that insane price at mouser

the LT1083/LT1033 should drop right in as well and these are much better

0.2" board connectors aree rare as hens teeth, just use the 0.1 and remove every second pin. i'll find the stacking headers, but I dont know that DK has them, both ELFA and mouser have them though, perhaps a GB because they are a bit unreasonable

Last edited by qusp; 1st October 2010 at 07:10 PM.
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Old 1st October 2010, 07:19 PM   #363
qusp is offline qusp  Australia
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stacking pinheaders
3 position AMPMODU socket they have them all at mouser, I used them for my ackodac reg stacking. they have all different types, check the datasheet of the linked part for part numbers. you need to buy 3 pin for 2 pin, 5 pin for 3 pin, 7 pin for 4 pin etc. its the same ones used for the IVY

Last edited by qusp; 1st October 2010 at 07:22 PM.
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Old 1st October 2010, 07:21 PM   #364
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Quote:
Originally Posted by opc View Post
Hi Guys,

Schematic is finalized, and the BOM is finished as well. You can find them both attached below. I've put the parts in as what I would select if I were building this as a "Sensible Audiophile".

The most expensive parts are the polypropylene film output coupling caps at $10 each, followed by the Caddock resistors at $3.50 each. I would imagine many will want to use their own coupling caps, but these fit nicely, and they're what I'll be using.

I'm having trouble sourcing the 400 ohm Caddock MP930 1%, and the DK number on the BOM for that part is made up. 400R is listed on the datasheet as a standard value, so if anyone knows where to get it, let me know. Maybe with a GB we can get all the Caddock parts at once and save a little cash.

Otherwise, all the parts are listed with DK numbers, so feel free to look things up and make comments or suggestions for anything you feel could be improved. $52 resistors are not going on my short list, however.

I took a look at the Linear LT317/337, and they look like they'll drop right in for anyone who would like to spend a little more on regs.

One final issue I'm having is finding any 0.200" pitch inline board to board connectors. I've looked all over Digikey, and I can't find anything. I needs connectors to go between the bottom of the Buffalo II (spacing fixed at 0.200") and the top of my board (also space at 0.200" to match the Buffalo). I don't really want locking ones since it's completely unnecessary for this application. I basically want your standard 0.1" header/socket but with 0.2" spacing. If anyone knows where to get these I would appreciate it! I need a 2 pin, 3pin and 5pin version, although the 5 pin could be replaced with a 2 pin if needed.

Cheers,
Owen
The MKP can be purchased at Parts Connexion: Axon MKP 22uF 250V (D: 28.5mm x L: 43mm) at 4$64 each instead the Epcos a 10$60 each

AXON True Cap Metallized Polypropylene Capacitors

Q1-4 at Mouser 1€21 = 1$66 instead 1$94 at DK

Last edited by merlin el mago; 1st October 2010 at 07:40 PM.
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Old 1st October 2010, 07:41 PM   #365
qusp is offline qusp  Australia
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thought I had seen them at DK too

7 position (4 position) at digikey
5 position at DK

etc etc. these things will stack on any vertical header, best to get the 30u gold as the plate last longer. the price drops dramatically with numbers
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Old 1st October 2010, 07:45 PM   #366
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Quote:
Originally Posted by qusp View Post
they arent 52 anywhere sensible. they are 14 singly normally and thats ridiculous, I did a full double take when I saw that insane price at mouser

the LT1083/LT1033 should drop right in as well and these are much better

0.2" board connectors aree rare as hens teeth, just use the 0.1 and remove every second pin. i'll find the stacking headers, but I dont know that DK has them, both ELFA and mouser have them though, perhaps a GB because they are a bit unreasonable
Hi

The LT1033 is now obsolete unfortunately. LT recommend LT1185 as a replacement, which is crazy as it's a 5 pin reg!!

LT337 should be good enough for the negative reg do you think? And LT1086 is the positive 1.5A version and is cheaper than LT1085. Very very good regulators.

It may worth getting them direct from LT.

http://www.linear.com/pc/productDeta...40,C1019,P2050

http://www.linear.com/pc/productDeta...40,C1055,P1358
__________________
Rich

Last edited by RichLund; 1st October 2010 at 07:49 PM.
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Old 1st October 2010, 07:52 PM   #367
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Quote:
Originally Posted by qusp View Post
forget farnell and RS, both are ripoff!! sumumu are def my favorite thin film and mouser has a good range of them in stock. I prefer mouser mainly because of the free international fedex 2 day shipping after 200 dollar order . of course there is the SMD zfoil range, but they are like 14 dollars a pop, though I still may choose 1 or 2 positions worthy of them just because. of course I just made a 400 dollar order with mouser yesterday, but I usually make a regular order every 2 weeks; hows that BOM going Owen?
qusp:
Can you share what you consider the worthy positions?
Any further thoughts on how to use with Acko's board?
Nice suggestion on the headers
Best
Bob
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Old 2nd October 2010, 12:17 AM   #368
qusp is offline qusp  Australia
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Quote:
Originally Posted by RichLund View Post
Hi

The LT1033 is now obsolete unfortunately. LT recommend LT1185 as a replacement, which is crazy as it's a 5 pin reg!!

LT337 should be good enough for the negative reg do you think? And LT1086 is the positive 1.5A version and is cheaper than LT1085. Very very good regulators.

It may worth getting them direct from LT.

Linear Technology - LT337A - Negative Adjustable Regulator

Linear Technology - LT1086 - 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
I have 1085/1033 here; I think you'll find that PCX has the both 1085/1033 still. this is an annoying thing about linear, that they will often have what are suposed to be complimentary devices in utterly different packages.

just woke up, will have a look in a couple hours, flocchini. we have an open house in 45 mins
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Old 2nd October 2010, 03:45 AM   #369
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enjoy
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Old 2nd October 2010, 04:21 AM   #370
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Parts Connextion has Caddock MP930s at 390 ohms
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