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Krell KSA 100mkII Clone
Krell KSA 100mkII Clone
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Old 16th November 2006, 07:25 PM   #911
RKH is offline RKH  United States
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Default heatsink

I might be able to keep a channel or two comfy with this ... no?http://cgi.ebay.com/ws/eBayISAPI.dll...6535&rd=1&rd=1
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Old 16th November 2006, 08:15 PM   #912
gaborbela is offline gaborbela  Canada
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HI
Would you please somebody let me know were I can find the BOM for the KSA-100 .Right now all the resistors are on sale at Partsconnexion . Only 15% of but better than nothing .
I would like to colect the pars until the PC board will be ready ..
Thanks
Regards
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Old 16th November 2006, 08:22 PM   #913
VT67 is offline VT67  Belgium
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I don't know whether this is the latest edition, but it's the one I used.

EDIT: Removed the BOM because it was not the most updated version.
Don't want anybody start ordering wrong or incomplete parts.

Regards
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Old 16th November 2006, 08:26 PM   #914
PWatts is offline PWatts  South Africa
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That BOM is a bit outdated and has a few errors on it as well. The FET's are listed incomplete and since I changed the PSU configuration the decoupling caps have increased and assigned different reference designators. The jumpers have also increased from 1 to 3. The updated version is at work unfortunately but I'll post it tomorrow.

The resistors and caps of the non-optional section is correct though, but I'd change R17 & R18 to 0.5W too to be on the safe side, and R38-R41 cannot do harm by going to 0.5W as well. The only one that's mandatory to be 0.5W are the 12k's since they dissipate over 120mW.

Since I've to place an order at Parts Connexion anyway, I'll see if I can add the order numbers and prices to the BOM of what would be a good balance. It will be a combination of PRP, Holco and Mills resistors, polystyrene and silver mica pF caps, BG Std for the 10uF 16V (they're cheap anyway) and Solen 1uF for the PSU decoupling.

The rest, preferably the Wima/Rifa MKP 100nF's and Panasonic FC electrolytics should be sourced elsewhere or otherwise use what you can find, just make sure they'll fit on the pads. For the semiconductors it's each man for himself.

It would be good also a few "pioneers" may experiment early on with the various type of FET's provided for to see if there's any clear winner. The IRFD types are easy to do so with since they fit into a DIP-4 socket, but the SOT-223 packages are for keeps once they're mounted unless you've skill and guts.

For the LTP transistors fast ones would be preferable if fast output transistors will be used, and that's why the original 2SA/2SC ones will do well or alternatively BC546/556 that may work possibly even better.
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Old 16th November 2006, 09:28 PM   #915
loek is offline loek  Netherlands
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Hi Mark, just sent you money for 4 boards for dr.Strangelove3 and 2 for me. I feel lucky to know your DIY folks.
Thanks.
Loek
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Old 16th November 2006, 11:57 PM   #916
gaborbela is offline gaborbela  Canada
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HI
With out the BOM it would be difficult to look for the parts or order them.
Which schematic we use , or some information about the transistor , mosfet replacement .
I thought we have the BOM like at KSA-50 .
Mark you already built the amp for test , which schematic U used ?
I just want to order the resistors until the sale end at Partsconnexion .
I don't want GB on the parts , I have some Panasonic capacitors and transistors already .


Regards
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Old 17th November 2006, 12:03 AM   #917
Mark A. Gulbrandsen is offline Mark A. Gulbrandsen
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Somewwhere there is a BOM that Pwatts posted. I will have more time tommrrow night to get this stuff posted on the WIKI.

Mark
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Old 17th November 2006, 12:06 AM   #918
dr.strangelove3 is offline dr.strangelove3  Netherlands
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Thanks Loek for the combined payment and shipment!
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Old 17th November 2006, 01:59 AM   #919
bobgroger is offline bobgroger  United States
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Paid for 4 boards 11/16/2006 $84
Any movement on Heat Sink GB?
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Old 17th November 2006, 05:16 AM   #920
PWatts is offline PWatts  South Africa
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Here's the latest version of the BOM. Somebody can look it through to make verify everything, but I think it's correct. The schematic link is posted at the wiki page.

Please let me know if anything's unclear so I can change it.
Attached Files
File Type: pdf ksa100 bom.pdf (19.6 KB, 204 views)
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