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Post by Deleted on Sept 5, 2011 21:52:14 GMT
Hi Alan well done Alan you lasted longer than i did ;D ;D fair point on the diodes i guess that I'm just so used to using the same old regs that it's become a bit of a habit with me but well spotted. sooooo good to go then take care ''Hi Shaun With Alan's later drawing using individual secondary windings and only 2 JLHs , the CLs in the JLH will not be required. Originally, we had 4 JLHs all drawing heavy startup currents. Alex'' Hi Alex thanks for the info seems to make sense take care
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leo
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Post by leo on Sept 5, 2011 22:00:35 GMT
Thanks Alex, I see, the regs are adj 1.2v to 15v so 5K is catering for the higher end. Is there anything else you would change or am I good to go with this? Alan Alan Does that toroidal have 2 separate secondary windings ? You don't need 12VAC centre tapped to get the voltages you need. If it does, I would feed analogue and digital areas of the DAC from individual secondary windings. 6V AC will still give your regulators plenty of head room. 10uF Input filter caps are far too low IMO. I would use 1,000uF there. Perhaps Leo or Will need to chime in here re splitting the supplies to different sections of the PCB ? Alex Sounds all good Alex, Some chips can inject crap onto the supply so I'd keep the XO as isolated as possible Using all single rails is easier and worth splitting the CT of the traffo if possible. Sticking the JLH's in there may make the differences in choice of three pin regs less noticeable so LM317 may be ok for those struggling to find the lower noise types. Usually worth sticking a low ESR on the adjust pin, obvioiusly not on the output pin though to avoid instability.
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Post by Deleted on Sept 5, 2011 22:05:01 GMT
Alan Does that toroidal have 2 separate secondary windings ? You don't need 12VAC centre tapped to get the voltages you need. If it does, I would feed analogue and digital areas of the DAC from individual secondary windings. 6V AC will still give your regulators plenty of head room. 10uF Input filter caps are far too low IMO. I would use 1,000uF there. Perhaps Leo or Will need to chime in here re splitting the supplies to different sections of the PCB ? Alex Sounds all good Alex, Some chips can inject crap onto the supply so I'd keep the XO as isolated as possible Using all single rails is easier and worth splitting the CT of the traffo if possible. Sticking the JLH's in there may make the differences in choice of three pin regs less noticeable so LM317 may be ok for those struggling to find the lower noise types. Usually worth sticking a low ESR on the adjust pin, obvioiusly not on the output pin though to avoid instability. Hi Leo There is no reason why Alan couldn't double up on the PSUs for a total of 4 as originally, but using the 2 separate secondary windings as now. Alex
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Post by Deleted on Sept 5, 2011 22:05:29 GMT
Hi Alan, Yes, point taken on the extra diodes . I read the the same notes, on the following page (9) of your quote they write; followed by a diagram showing the "optional" diode in parallel with the 1086. Having recently asked for guidance on optimising another power supply I pretty much jumped on this as it was so fresh in my mind. It's presumably only for protection under extreme overload/short-circuit which hopefully would never arise. Either way is obviously good As regards your "PS" programme, I couldn't find any useful reference, to what you were producing ( even under budgie! ), on the net. Could you spell it out for a less wise young'n' Cheers, Chris
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Post by Deleted on Sept 5, 2011 22:17:27 GMT
Hi All Just a quick question i remember reading a thread on diyaudio some time back which ran with the idea that the 317 type regs ''quietness'' was Dependant on the current being drawn through it. some advocated using a bleed resistor across the OP of the reg and drawing 100ma through it as it was supposed to run quieter at higher currents. the usual charts and graphs where used to demonstrate the theory. i did have a play with that idea when i used the Teddyregs but could hear no difference so lost interest. it's something thats been niggling me for some time any thoughts? take care
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Post by Deleted on Sept 5, 2011 23:21:38 GMT
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Post by Deleted on Sept 5, 2011 23:38:59 GMT
Hi Chris, sorry a little "tongue in cheek" with that one. PS is Photoshop I use it for everything graphical.......took me a long time to get my head around it but it does a good job. Budgie is me as in "He rattles on like a Budgie"......Budgerigar Alan
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Post by Deleted on Sept 5, 2011 23:57:15 GMT
Alan
Looks O.K. to me.
Alex
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Post by Deleted on Sept 6, 2011 9:09:25 GMT
Thanks for the assistance Alex, woodwork project to finish then I might cut a few boards......... FR4 that is..... Alan
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Post by Deleted on Sept 6, 2011 23:41:41 GMT
Hi all interested in Will's Sabre Pocket Knife. Layout for the PSU...Ala....me....you and everyone who chipped in and stopped me from an almighty bang and a little more egg on the face ........is now printed on a sticky waiting for the router to fire up. The board works out at 62mm by 35mm......just hope I've not missed a bit out. Question.......heatsink........required?.......not required? Probably should stick a small one on anyway......whats the perceived thinking. Alan
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Post by Deleted on Sept 7, 2011 0:07:11 GMT
Hi Alan No heatsinks required with individual 6V AC windings . Regards Alex
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Post by Deleted on Sept 7, 2011 14:38:21 GMT
Hi Alex, that's great ordered the bits with RS yesterday there here on the bench today......great service. Mmmm!! now where is that Sabre board okay Shaun only kidding. Alan
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Post by Deleted on Sept 7, 2011 14:44:32 GMT
Hi Alex, that's great ordered the bits with RS yesterday there here on the bench today......great service. Mmmm!! now where is that Sabre board okay Shaun only kidding. Alan ;D ;D ;D ;D ;D ;D
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Post by Deleted on Sept 7, 2011 20:42:42 GMT
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Post by Deleted on Sept 7, 2011 21:51:22 GMT
Hi Alan WOW that's just superb work and up to your usual high standards. now then how do you fancy knocking us up a few DAC boards? ;D ;D ;D ;D i always just love your work it's Total DIY take care
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Post by Deleted on Sept 7, 2011 22:09:30 GMT
Alan I still find it incredible that you are able to make PCBs like that without chemicals. Nice work ! Kind Regards Alex
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Spirit
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Post by Spirit on Sept 8, 2011 1:02:48 GMT
Beautiful work Alan Certainly a hell of a lot prettier than my etched boards
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Post by Deleted on Sept 8, 2011 10:02:48 GMT
Hi Phil, thanks for that much appreciated. Of course that pic is of the proof print on a bit of foamboard which lets me insert the components for a final jiggle about it certainly looks the business with the printed top but the print is carbon based so it can't be used on the working boards. Question for the boffins...............if the printed layout was done on an inkjet printer could it be retained as part of the final make??? Etching boards with chemicals too messy for me.............cut the copper with a sharp knife and small wood chisel......anyone could do it that way easy for simple layouts complicated for something like a DAC (Shaun ;D ;D ;D) or router bit in a Dremel much quicker my preferred method. Alan
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mrarroyo
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Post by mrarroyo on Sept 8, 2011 10:37:37 GMT
Very nice work indeed.
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Post by jeffc on Sept 8, 2011 12:02:50 GMT
Alan, Simply awesome stuff. You're making me second think my idea of using 4 separated LiFePO4 battery supplies but then again... I'm sure there will be a few ways this Pocket Knife is sharpened. cheers.. jeffc
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jonclancy
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Post by jonclancy on Sept 8, 2011 22:56:30 GMT
I found that the Sabre has a higher output than my AYA when I was swapping them around today. The AYA has a more timbre and a refined delivery, but the sabre surprises me with its forward presentation and wider soundstage. I'll be running two Pocket Knives. One with standard SPDIF in and the other using Jocko's input. If my hunch is correct, there should be a discernable difference! Tell you what, though. At the cost, the Pocket Knife will be the new King El Cheapo!!
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Post by Deleted on Sept 8, 2011 23:27:55 GMT
I found that the Sabre has a higher output than my AYA when I was swapping them around today. The AYA has a more timbre and a refined delivery, but the sabre surprises me with its forward presentation and wider soundstage. I'll be running two Pocket Knives. One with standard SPDIF in and the other using Jocko's input. If my hunch is correct, there should be a discernable difference! Tell you what, though. At the cost, the Pocket Knife will be the new King El Cheapo!! Hi Jon interesting stuff and sounds like the kid's got potential. it's nice to have something that sounds a little different and as you say pretty inexpensive. It could be that Will's provision of a dedicated PSU option for the XO could improve things still further. I'll look forward to some comparisons it's going to be interesting getting some thoughts on how the 9022 compares to the 23. i was informed by Phil at line one that the production had been tightened up on the 23. they did have both in stock so no reason to do a sales thang on me. from what I've read it looks like the 23 OPV is a little more adjustable than the 22 with 1.9V up 2.6v. a change of resistor is needed and a bump up in PSU V to 3.6. attention adjustable supply users. so a well deserved plug for a great company Phil @ lineone is a real gent and treated me as if i was ordering 25000 rather than the more modest quantity i ended up with. For ALL of your ESS needs. I'd recomend www.lineonesales.co.ukthey don't list the 9023 on their web site but they had them delivered to me from stock in two days (with sane postage rates) which was just awesome. they also accept pay pal which helps All good then so far take care
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Post by Deleted on Sept 9, 2011 0:33:24 GMT
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Will
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Post by Will on Sept 11, 2011 19:44:27 GMT
This and the working version overt in the USB thread are awesome! Good work sir!
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Post by Deleted on Sept 14, 2011 0:05:52 GMT
Well thank you Will looks like I might have Will's SPK for Christmas. Here's a couple of pics of the PSU made up on foamboard it all looks good to go so build one later today after a little shuteye. Alan
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