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DIY Workshop » σ22 and σ11: Discrete, dual-rail & single-rail regulated PSUs (part 2) amb  Headphone Council Joined: Apr. 1, 2004 |  Message [#1] posted on: 11-07-2008 01:21 AM CST (US).   |  |  This is a continuation of part 1 of this thread. A new thread is needed because of the 1000-post per thread limit of this forum. Let's keep a good thing going. |
| headphone1235 Member Joined: Nov. 7, 2008 | Message [#2] posted on: 11-09-2008 02:41 PM CST (US). | | I've finally decided to use the σ11 power supply to run the m3 amp, I've followed your parts list and found some of the parts obsolete, I've chosen a few replacements to suit the project. Amb can you please check my spreadsheet (again  ) to see if everything is alright? If all is right I'll start ordering all the parts  Attachment: C4399.xls |
| amb Headphone Council Joined: Apr. 1, 2004 | Message [#3] posted on: 11-09-2008 04:45 PM CST (US). | | headphone1235, looks ok. You only need one heatsink grease between the M³ and the σ11. Also, you can use just one of the 2P terminal blocks unless you have other things you want to connect to the power supply. |
| headphone1235 Member Joined: Nov. 7, 2008 | Message [#4] posted on: 11-09-2008 09:55 PM CST (US). | |
Ok, thanks for helping me out. I've ordered today, how long does it take to get it shipped (express) to Australia? |
| amb Headphone Council Joined: Apr. 1, 2004 | Message [#5] posted on: 11-09-2008 10:38 PM CST (US). | |
It should be less than a week, depending on how long it takes to clear customs and the efficiency of your postal service. |
aos HeadWizer Joined: Jun. 15, 2008 | Message [#6] posted on: 11-19-2008 02:02 PM CST (US). | | A quick sanity check, the same sigma 22 can power either Dynahi or Beta 22, right? Both use +- 30V, correct? I have an unused Avel Lindberg 2x30V 120VA (I think it's 120VA) transformer that people used in the original Dynahi batches 4 years ago (yeah, I have half-finished Dynahi lying around for 4 years) which should be more than capable even for balanced dynahi or 6 boards beta 22. I am worried about heatsinking sigma though - I believe dynahi uses 300mA per board or 600mA per stereo set. From amb's website, onboard heatsinks should be able to handle this. Is this correct? I hate dealing with outboard heatsinks so much that I'd rather build one sigma 22 for each dynahi board than have to deal with them. If I put sigma 22 in a separate enclosure it should then be able to power either amp, should I decide to build them. |
| amb Headphone Council Joined: Apr. 1, 2004 | Message [#7] posted on: 11-19-2008 10:05 PM CST (US). | | aos, yes, you can use σ22 +/-30V to power the β22 and dynahi. The σ22's default onboard heatsinks are safe for powering up to four β22 boards (provided the casing has good ventilation), which is about 800mA. I've used my own σ22 to power my dynahi with no problem whatsoever. Both amps have separate PSU and amp enclosures, and I made the umbilical cord connector and pin assignments compatible for just this reason. |
| aos HeadWizer Joined: Jun. 15, 2008 | Message [#8] posted on: 11-25-2008 06:07 PM CST (US). | | Well, I did something really stupid yesterday. Turned all 4 diodes backwards - which is much easier done on these TO-220 cases than with classic ones. The fuse blew big time, and repeated that even after I reoriented them. Even the fast blow 1.5A fuse blew. But I didn't have any proper slow blow fuses - the 0.5A I had blew in less than a second as well. I just bought some 1.25A ones so hopefully nothing died in this mishap. Lacking a fuse but having a lab PS, I applied 30V DC to the regulator (past diodes) and other than a short 1.5A inrush, no problems that I can see. If something died, having to desolder stuff to find a culprit will be hell. |
| amb Headphone Council Joined: Apr. 1, 2004 | Message [#9] posted on: 11-25-2008 07:00 PM CST (US). | | Sorry to hear about the mishap, aos. The diodes' silkscreen markings should have been pretty clear... |
| aos HeadWizer Joined: Jun. 15, 2008 | Message [#10] posted on: 11-25-2008 07:14 PM CST (US). | | Oh the markings are clear enough. That's why I said I did something stupid. I made 3 sigmas before without any incident. And after inserting the proper fuse, it works just fine. Well, I apparently inverted the LED, too. Since you brought it up, unlike rectifiers, the LED doesn't have clear markings on the PCB as to what is anode and what is cathode. Might be worth fixing if you ever get to making another board revision. [Edited by aos on 11-25-2008 at 08:51 PM.] |
| mp101 Member Joined: Dec. 1, 2008 | Message [#11] posted on: 12-04-2008 06:04 AM CST (US). | | Hi Ti, Would the following be OK with a Sigma 11 http://www.avell...range_specs.htm Y236103 or could I use one that you suggest for the Sigma 22? Y236356
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| amb Headphone Council Joined: Apr. 1, 2004 | Message [#12] posted on: 12-04-2008 06:14 AM CST (US). | | What output voltage and current are you looking for? The Y236356 is a 30V+30V unit, which is well beyond the maximum supported for any application on the σ11. The "Parts list" section of the σ11 website has transformer selection guidelines. |
| mp101 Member Joined: Dec. 1, 2008 | Message [#13] posted on: 12-04-2008 06:54 AM CST (US). | | Im pretty new when it comes to selecting parts, I can follow instruction  I was looking at possibly 24v, I think I quoted you the wrong part no before, either Y236102 (30VA Load) Would any 12v + 12V be OK, or is there a maxLoad and Current I should be within? I will be building an M3 and want as much punh as I can, only driving HD650 & DT770/80ohm for now, later I will build a Sigma 22 and a Beta 22. I would also like to build one or two for my Squeezebox's I can buy direct here in the UK from Avel Lindberg, else its high shipping charges Import Taxes and VAT Thanks |
| amb Headphone Council Joined: Apr. 1, 2004 | Message [#14] posted on: 12-04-2008 07:13 AM CST (US). | | Y236002 is adequate, but Y236102 is a little better. My own M³ runs on a σ11 configured to output 27V with an Amveco 12V+12V 25VA toroid. For the squeezebox you'll be looking at a totally different transformer because the output is 5V. |
| mp101 Member Joined: Dec. 1, 2008 | Message [#15] posted on: 12-04-2008 11:57 AM CST (US). | | Thanks so much Ti, Sorry, 1 more Also for a Sigma 11 psu for the Squeezebox, your Sigma 11 site say s a dual 9 for -/+5v, so I was looking at Y236001 Would any of the other components need to change as a result of the different output voltages? As I mentioned I would like to build the following in this order Sigma 11 for M3 So will probably order all my toroids from the same place (if I can) to avoid lots of shipping charges, up to 10 unit from avel lindberg only costs me £9.50 Thanks again Marc [Edited by mp101 on 12-04-2008 at 11:57 AM.] |
| mp101 Member Joined: Dec. 1, 2008 | Message [#16] posted on: 12-04-2008 12:25 PM CST (US). | | Ti, Sorry to be such a pain (and a noob) Just attached an XLS, I created using details from your site, does it look right for the AMB parts? I went for the Wima MKS2 1µF 63V MKS film capacitors over the Vishay-BC MKT370 1µF 63V MKT film capacitors Thanks [Edited by mp101 on 12-04-2008 at 12:27 PM.] Attachment: C4441.xls |
| amb Headphone Council Joined: Apr. 1, 2004 | Message [#17] posted on: 12-04-2008 03:42 PM CST (US). | |
I recommend a Y236101 for the squeezebox. The Y36001 is only 15VA which is a bit too small for the squeezebox.
Yes, read the σ11 website parts list section carefully. Y ou'll need a different D5, and you should omit R10.
As of this moment I am down to only one ε22 backplane board in stock. I have not ordered any more because the demand for these have dropped to almost nil in the past months. Unless there is a sudden demand for many more, it will be discontinued after the last one is sold.
You don't need any IFZ24N/IRF9Z34N MOSFETs on the σ11 board, and you don't need any BC556B on the M³ board. [Edited by amb on 12-04-2008 at 03:43 PM.] |
| aos HeadWizer Joined: Jun. 15, 2008 | Message [#18] posted on: 12-04-2008 10:36 PM CST (US). | |
Oh no! And here I was trying to be responsible in this time of crisis and not buy it until I need it... Now they're gone. How come people don't want them? [Edited by aos on 12-04-2008 at 10:37 PM.] |
| amb Headphone Council Joined: Apr. 1, 2004 | Message [#19] posted on: 12-05-2008 02:01 AM CST (US). | |
I think most new β22 builders are now going with 4-channel balanced configurations, and the ε22 backplane is only for 3-channel active ground. |
| aos HeadWizer Joined: Jun. 15, 2008 | Message [#20] posted on: 12-05-2008 02:11 AM CST (US). | | But I thought 3 channels would be the most appropriate for majority  Balanced requires not only balanced source but also a special headphone cable - IF your headphone support it. Or some serious physical modifications. I thought only ultimate headphone lovers would go for that?Oh well, I suppose I'll do the same and use it in single ended mode for the time being until I get my ultimate DAC working... |
| amb Headphone Council Joined: Apr. 1, 2004 | Message [#21] posted on: 12-05-2008 02:57 AM CST (US). | | I think what had been happening in recent times is that β22 has well established itself in the high-end headphone amp circle, and those who have the budget to build one tend to go for the "max" configurations. |
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