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DIY Workshop » discrete buffer: jisbos (air wired) Mister X  HeadWize Fanatic Joined: Jul. 23, 2003 |  Message [#160] posted on: 11-13-2007 04:39 AM CST (US).   |  |  My list got ate! [Edited by Mister X on 11-15-2007 at 03:15 AM.] |
| Mister X HeadWize Fanatic Joined: Jul. 23, 2003 | Message [#161] posted on: 11-13-2007 05:35 AM CST (US). | | It seems they only let you change an attached file 35 times before it gets lost.  [Edited by Mister X on 11-15-2007 at 03:14 AM.] |
| Ryssen Member Joined: Feb. 16, 2007 | Message [#162] posted on: 11-13-2007 06:02 PM CST (US). | | Anyone tried Mje340/350 as outputs? Where to get the 2sc2344 e/2SA1011 e? [Edited by Ryssen on 11-13-2007 at 06:04 PM.] |
amb Headphone Council Joined: Apr. 1, 2004 | Message [#163] posted on: 11-13-2007 08:11 PM CST (US). | |
I haven't tried them, but the MJE340/350 are rated at only 0.5A. While that is more than sufficient for normal circumstances, an accidental output short circuit may also cause them to be damaged more easily than the default MJE243/253 or BD139/140.
These are available from B&D Enterprises in the US. Note reversed pinout and TO-220 instead of TO126/TO-225AA package. [Edited by amb on 11-13-2007 at 08:12 PM.] |
| Ryssen Member Joined: Feb. 16, 2007 | Message [#164] posted on: 11-14-2007 07:24 PM CST (US). | | Ok,i like details so I will order some 2sc2344 e/2SA1011 e. For C3,I have a full bag of 100pf micas,can I use 100pf for C3? |
| amb Headphone Council Joined: Apr. 1, 2004 | Message [#165] posted on: 11-14-2007 10:58 PM CST (US). | |
100pF will round off the square wave response a bit. It would be best if you stay with 33pF. [Edited by amb on 11-14-2007 at 10:58 PM.] |
| Mister X HeadWize Fanatic Joined: Jul. 23, 2003 | Message [#166] posted on: 11-15-2007 03:17 AM CST (US). | | Hopefully this is the last parts list I post. It now contains Farnell part numbers for everything.  Now please excuse me while I return to listening to my "SOHA buffers"
Attachment: C3175.txt |
| forsakenrider Member Joined: Oct. 3, 2007 | Message [#167] posted on: 11-15-2007 07:47 AM CST (US). | | Mister X, thats teasing!! When do we get the boards, huh huh huh huh!!! |
| Mister X HeadWize Fanatic Joined: Jul. 23, 2003 | Message [#168] posted on: 11-15-2007 01:44 PM CST (US). | |
Three to four weeks depending on how long it takes Canadian customs to process your parcel. |
| daveze Member Joined: Oct. 14, 2007 | Message [#169] posted on: 11-16-2007 06:27 AM CST (US). | | Mister X: Not sure if your Farnell No's all apply for Australia. I've attached my Rev A of the BOM in excel format, for the next rev I'll include the fact that I need to populate 10 boards, and aim to compare purchase in Australia vs US. I don't have local source for Q5 or Q6 so far (other than the MJE243/MJE253). Oh yeah, still need the SOHA kits... Attachment: C3182.xls |
| daveze Member Joined: Oct. 14, 2007 | Message [#170] posted on: 11-16-2007 07:07 AM CST (US). | | I tell a lie, I have the BD137/138. I'd guess that these'd be the most likely candidates for the 3R3 resistors on the output? |
| Forsakenrider Member Joined: Oct. 3, 2007 | Message [#171] posted on: 11-16-2007 07:44 AM CST (US). | | A question definitely in the wrong place.... What does everyone use for mounting boards to the chassis? and Tabarnak de customs osti! |
| Mister X HeadWize Fanatic Joined: Jul. 23, 2003 | Message [#172] posted on: 11-16-2007 02:57 PM CST (US). | |
I only cross checked them for Europe so I can't say that comes as any surprise.
I can't speak for everybody but I normally use 1/2" long 4/40 imperial flat head screws, nuts and 1/4" plastic spacers. |
| holland Member Joined: Sep. 24, 2007 | Message [#173] posted on: 11-16-2007 08:27 PM CST (US). | | MisterX, What's that before the buffers? I can't quite make out the chips in the picture. As a guess, it looks like an AC rectification stage, but I don't recognize the board, layout or chips. |
| Mister X HeadWize Fanatic Joined: Jul. 23, 2003 | Message [#174] posted on: 11-16-2007 09:43 PM CST (US). | | You mean the thing that sez LS audio A-13 on it?
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mb3k Member Joined: Mar. 2, 2006 | Message [#175] posted on: 11-18-2007 06:02 PM CST (US). | | I've been away from DIY for a bit here, and it seems like things have progressed One question, is there any parts changes recommended on the actual SOHA board to support the JISBOS? I remember a post on Head-Fi awhile back but shedding some light on it again is something I'm looking into (to update my SOHA page). |
| amb Headphone Council Joined: Apr. 1, 2004 | Message [#176] posted on: 11-18-2007 07:36 PM CST (US). | |
You might need to add heatsinks to the SOHA voltage regulators if they run hot with JISBOS. |
| regal HeadWizer Joined: Jun. 21, 2006 | Message [#177] posted on: 11-19-2007 01:02 PM CST (US). | | Is it still OK to substitute for Toshiba 2SC2238 2SA968 transistors ? |
| amb Headphone Council Joined: Apr. 1, 2004 | Message [#178] posted on: 11-19-2007 02:52 PM CST (US). | |
I have not tested with them, but you can certainly try them if you wish, noting the reversed pinouts. |
| thor Member Joined: May 13, 2006 | Message [#179] posted on: 11-23-2007 08:35 PM CST (US). | | For C1&C2 what is the lowest voltage 100uf capacitor that can be used ? example: Elna Cerafine 25v/100uf which is 9x16mm in size ect... |
| Mister X HeadWize Fanatic Joined: Jul. 23, 2003 | Message [#180] posted on: 11-23-2007 08:39 PM CST (US). | |
For what? A SOHA with 12 volt regulators? |
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