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heathkid Member Joined: Mar. 10, 2009 |  Message [#120] posted on: 03-13-2009 10:43 PM CST (US).   |  |  Is everyone as excited about the PIMETA v2 as I am?  |
tangent  Headphone Council Joined: Aug. 27, 2001 | Message [#121] posted on: 03-13-2009 11:59 PM CST (US). | | No, I think it's just you. fish, fish |
| heathkid Member Joined: Mar. 10, 2009 | Message [#122] posted on: 03-16-2009 01:01 AM CST (US). | | Surely not JUST ME.  Where is everyone? Hot topic a week or so ago. Is everyone just waiting to see the final PCB design? I love the layout and the SMT part compatibility. I can't wait to try out some of the newer parts... |
| tangent Headphone Council Joined: Aug. 27, 2001 | Message [#123] posted on: 03-16-2009 05:10 AM CST (US). | | Final look before prototype availability. I intend to order on St. Patrick's Day, because, um, the prototype boards will be green. That's the reason. Yes.
Changes: - SMT pads and labels for C4s - Added sound wave symbols on top side above buffers. The good reason is that this gives a big visual hint about where the channels are on the board. The real reason is to use up some otherwise unusable space. - Straightened left-channel post-pot trace: the need to hug the board edge went away when I moved the amp section toward the back of the board many revs ago. - Almost completely removed inner layer planes under the scratchpad area. The planes poke in just enough to envelop the pads connected to those planes. - Thickened most signal traces to 32 mil - Lots and lots of small tweaks In this board image, notice that I'm now showing the NKK G22AH board-mounted switch instead of the larger one I showed in the previous image. Just so you can see what's possible... For various reasons, I've decided that I'm going to handle the prototyping stage for this project a little differently than I have in the past. I'm going to order 10 boards, and send all but 2 out to people who, I feel, either contributed materially to the final design or who will bring something useful to the prototyping effort. There will be no cost for this, and no obligation to build or test it. I do hope to get build and test reports from everyone who gets a board, of course. I combed this thread looking for those who contributed to the discussion, and came up with this list: - PRR Anyone on that list who doesn't want a board, let me know and I'll reassign the slot. There's one board left unassigned, and possibly someone will opt out, so if you think you deserve one or can help in some way by building one, send me a PM or an email. Again, I expect to order on the 17th, so don't dally. The prototypes will arrive here about a month after I order them. A little something to lift the post-Tax Day gloom, perhaps? Thank you all for your comments, suggestions, and discussion. The PIMETA v2 is better for it. |
| joneeboi Member Joined: May 4, 2007 | Message [#124] posted on: 03-16-2009 08:30 AM CST (US). | | I'd be honoured to help. Just when my builder's itch started acting up too. |
| cobaltmute HeadWizer Joined: Jul. 10, 2008 | Message [#125] posted on: 03-16-2009 08:41 AM CST (US). | | I'm going to come back to this, because I think it is important: any way to put bypass caps for the buffers? I can't tell if the inner layers would work with this, but if you were to use 0805 SMD caps on the top where you put the sound wave symbols. You'd need three via's to bring the V+, V-, and GND to the top. I've just read enough about how important it is to have proper bypassing (including large caps) as close on the pins as possible to get the best sound out of a buffers and op-amps. |
| cobaltmute HeadWizer Joined: Jul. 10, 2008 | Message [#126] posted on: 03-16-2009 08:41 AM CST (US). | | And yes, I'd be happy to build one. |
| tangent Headphone Council Joined: Aug. 27, 2001 | Message [#127] posted on: 03-16-2009 08:50 AM CST (US). | | The problem is that there are traces on the top layer above BUFL and BUFR, where the SMD pads would have to go. I'm not seeing why I'd want to pessmize those traces just to get another set of caps half an inch closer than the C3s and C5s that are already present. Especially given that they're not needed in the inferior PIMETA v1.1 layout. |
| cobaltmute HeadWizer Joined: Jul. 10, 2008 | Message [#128] posted on: 03-16-2009 09:27 AM CST (US). | | D'oh. I had been looking that the area of BUFG and didn't look at the BUFL and BUFR. Guess I should look more and ask later. |
| kristleifur HeadWizer Joined: Apr. 10, 2006 | Message [#129] posted on: 03-16-2009 10:42 AM CST (US). | | I would absolutely love to build one. Honored to bits. -- I'll be building / testing this as a dual-rail PIMETA 2, so I anticipate buying a couple of TREADs at the same time. Let's drop the proto PCB into the same envelope ... I trust you'll let us know in good time, so I'm doing the same. |
linux-works Member Joined: Jul. 20, 2008 | Message [#130] posted on: 03-16-2009 11:05 AM CST (US). | | check out those new icons! "its a headphone amp" "headphone amp! fish finder!" (hey you two, its BOTH...) ...apologies to old 'saturday nite live'.
now, looking foward to the proto build! |
| heathkid Member Joined: Mar. 10, 2009 | Message [#131] posted on: 03-16-2009 03:37 PM CST (US). | | tangent... I'm very excited you've selected me to build a proto. Yes, I'll build it promptly and provide you with probably more feedback than you would like. Thank you and I'm really looking forward to building this! And... I love the sound waves. Very nice touch!
Thank you again!
|
voodoochile Member Joined: Oct. 17, 2002 | Message [#132] posted on: 03-17-2009 07:25 AM CST (US). | | That's quite a remodelling of this amp, Tangent. The board looks great! |
| tangent Headphone Council Joined: Aug. 27, 2001 | Message [#133] posted on: 03-17-2009 12:16 PM CST (US). | | Of course it is. I don't see how someone might have thought it could be something else. OPALR drive differential water transducers, and OPAG runs the pickup. The scratchpad area is for your DSP circuitry to decode the signals, and run the LCD. I recommend the PIC30 series, as it offers both a DSP and microcontroller in a single package. Thanks! No one's stepped up for the spare board yet. Do you want it? |
| voodoochile Member Joined: Oct. 17, 2002 | Message [#134] posted on: 03-17-2009 01:20 PM CST (US). | | I'm interested, but I've also been largely absent here for a real long time. Therefore, I could only accept it if there are definitely no other interested members. It was enjoyable reading through the dialog of the last six pages; you guys did well presenting your cases and keeping your heads. |
| linux-works Member Joined: Jul. 20, 2008 | Message [#135] posted on: 03-17-2009 01:26 PM CST (US). | | putting a cpu/controller on the proto area? hmmm. that gives me some really dangerous ideas (lol) I've been playing with arduinos lately. there is a small single-chip IP stack (ethernet dongle) called wiznet that works with it. I can see it now (fade to dream sequence) % ping pimeta2 hey, can we enlarge that proto area to take a full 28 pin DIP and a ceramic resonator? (I'm kidding) I can airwire the resonator. lol [Edited by linux-works on 03-17-2009 at 01:27 PM.] |
| tangent Headphone Council Joined: Aug. 27, 2001 | Message [#136] posted on: 03-17-2009 11:19 PM CST (US). | | Gerbers away. By the way, is anyone who will be building a prototype planning to use SMT parts everywhere it's possible? If not, I think I might hang onto the "extra" board and do two builds myself, one all thru-hole, the other avoiding thru-hole everywhere possible. That possibility aside, the spare goes to voodoochile. No one's refused my board offer yet, so there are no more spares available. |
Mister X HeadWize Fanatic Joined: Jul. 23, 2003 | Message [#137] posted on: 03-17-2009 11:34 PM CST (US). | | I have all of the SMD resistors and capacitors in my junk parts box so.... Do you have part numbers for the LEDs? |
| tangent Headphone Council Joined: Aug. 27, 2001 | Message [#138] posted on: 03-18-2009 12:54 AM CST (US). | | Any LED will work. The resistor values on the schematic assume a white LED, but they're easily tuned. I'll have an updated clone of the PIMETA v1 docs up before any of you build yours, which will tell you how to pick R values for different LEDs. The farthest I'd put it off is when I build my first one, so I'd have several shipping days to do it. |
| Mister X HeadWize Fanatic Joined: Jul. 23, 2003 | Message [#139] posted on: 03-18-2009 01:10 AM CST (US). | |  Danke. Attachment: C4764.png |
| tangent Headphone Council Joined: Aug. 27, 2001 | Message [#140] posted on: 03-18-2009 05:29 AM CST (US). | | The board footprints are for 5mm LEDs (as it was on PIMETA v1), so your 3mm LED won't sit down on the board. Not that I'd want it to. When I board-mount the LED in a PIMETA, it's because I'm using it to illuminate the interior of a clear case, so I want it about half an inch above the board, to better cast its light around the board. When panel-mounting it, you can just use hookup wires to the pads. |
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