G600 Posted November 1, 2014 Report Posted November 1, 2014 (edited) Gentlemen, I've just read the first 70 pages of this thread. Beside the reading pleasure (yeah, I'm getting as crazy as you all, finding that reading technical things is enjoyable), I saw something extremely special... This project is something I haven't seen before, and my English is too short to put proper words on it. Dr Gilmore, you have been quite busy doing this between bottle washing. Congrats to everyone that finished their T2. Edited November 2, 2014 by G600
nopants Posted November 28, 2014 Report Posted November 28, 2014 The on-semi announcement kind of throws a wrench in the works for the newer version of the T2 doesn't it? That being said, I have a few pieces of the mpsw06 left. Do we need to match the hfe, since it's a sub for the 3381?
spritzer Posted November 28, 2014 Author Report Posted November 28, 2014 We can use the Fairchild parts but I don't relish the thought of having to do the matching for a couple of T2's. I might have a line on some 2SC3381's so there will probably be two layouts.
kevin gilmore Posted November 28, 2014 Report Posted November 28, 2014 mpsa06 is fine for those, very low power. Fairchild version should be available for a long time.
nopants Posted November 28, 2014 Report Posted November 28, 2014 good to hear, in that case I think the main hurdle will still be the power fets.
JoaMat Posted November 28, 2014 Report Posted November 28, 2014 (edited) / Edited November 11, 2015 by JoaMat
nopants Posted November 28, 2014 Report Posted November 28, 2014 I like the stn substitute in that picture 1
JoaMat Posted November 29, 2014 Report Posted November 29, 2014 (edited) Just curious. Did Stax use c3381 in T2 servo. Edited November 11, 2015 by JoaMat
spritzer Posted November 29, 2014 Author Report Posted November 29, 2014 Stax used 2SC2291 but the schematic has it hand written on it "or 2SC3381".
kevin gilmore Posted November 29, 2014 Report Posted November 29, 2014 the one i had used the 2sc3381 parts same silicon, one was a 5 pin, the other a 7 pin
JoaMat Posted November 29, 2014 Report Posted November 29, 2014 (edited) How about HN4C51J as replacement for 2sc3381? It's a Toshiba dual NPN common base in sot-25. Edited November 29, 2014 by JoaMat
spritzer Posted November 30, 2014 Author Report Posted November 30, 2014 Not a whole lot of fun soldering those by hand though...
nopants Posted December 3, 2014 Report Posted December 3, 2014 my heart is being pulled so many ways I don't know what version to make
nikongod Posted December 3, 2014 Report Posted December 3, 2014 (edited) my heart is being pulled so many ways I don't know what version to make All of them. Because d-_-b Edited December 3, 2014 by nikongod
spritzer Posted December 3, 2014 Author Report Posted December 3, 2014 To add to your pleasure I will probably do a third version. It will be tailored to the parts I can buy in bulk but leaning more towards the original design. I've been stocking up on parts just in case I build some so a special version is in order.
nopants Posted December 3, 2014 Report Posted December 3, 2014 All of them. Because d-_-b It's kind of an issue Ari, if I have boards lying around I somehow always end up populating them. It's part of the reason I have shied away from p2p work, aside from incompetence. I started looking at the newer board files, do they have to have offboarded heatsinks? I got the impression that the original footprint was to match with aesthetics of the amplifier board.
nopants Posted December 4, 2014 Report Posted December 4, 2014 I was looking for one-off deals and found this for fabbing the boards. There's enough area to do a run of the original, so that should encompass all of the current variations that currently exist. Plus black is free, which is of course priceless Also some leftover space to add some boards if you were so inclined, was going to try to see if I could shove a dynalo in there Does anyone see issues using 1oz copper for this? There are also some more recent options such as PCBway which has criminally low prices, but I can't justify using this without forming a group
kevin gilmore Posted December 4, 2014 Report Posted December 4, 2014 would not do 1oz copper. too thin. 2 oz minimum, the original boards were 3oz
Voltron Posted December 4, 2014 Report Posted December 4, 2014 The original boards are badass and could cave in a skull. :dusty: 1
nopants Posted December 4, 2014 Report Posted December 4, 2014 fair enough, china it is. I think PCBWay quoted me 5 boards for 350-ish for just the amplifier
s_r Posted December 5, 2014 Report Posted December 5, 2014 If you want to split the cost I wouldn't mind taking an original board set (with the old sand like the 2sc3675's). Is that quote for the shrunk (400mm depth) boards?
nopants Posted December 5, 2014 Report Posted December 5, 2014 No that was for the original board, http://www.pcbway.com/pcb-board-quote.html
JoaMat Posted December 10, 2014 Report Posted December 10, 2014 Would cascaded CCS - be of any benefit in modified T2?
luvdunhill Posted December 10, 2014 Report Posted December 10, 2014 (edited) I am not sure it would. In the BH I can say it sounds much better to my ears* but didn't really measure any different. Edit: compared to the CCS that the BHSE uses. I still prefer the original CCS. Edited December 10, 2014 by luvdunhill
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