xerxes
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Post by xerxes on Apr 12, 2012 20:07:02 GMT
PCBs aren't particularly expensive, especially in comparison to many other components, so I don't think it will be hugely wasteful. I'm sure there will be opportunity to trade the bits you don't need as well.
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Deleted
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Post by Deleted on Apr 12, 2012 22:25:12 GMT
Will has designed separate larger dual regulated PSU PCBs with adjustable output for the Class A amplifier that can take larger components, and also permit mounting to a large heatsink if required. These could be ordered as part of the GB if needed. Just remember though, with all these PCBs, small runs cost a lot more. It's the initial setting up that costs money. Alex
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xerxes
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Post by xerxes on Apr 12, 2012 22:39:46 GMT
Would not maximum versatility, with broadest appeal be the way to go then?
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Post by Deleted on Apr 12, 2012 23:33:15 GMT
Would not maximum versatility, with broadest appeal be the way to go then? Not everybody will require that with perhaps more than a few PCBs. Why pay heaps more for something you don't need ? The price increases dramatically for small runs of larger PCBs. As an example, Greg Erskine's popular dual JLH PCBs cost around AU$2.20 each delivered, because of the larger quantity ordered. This means that many will get a few more for future projects. This the main reason why both Greg and myself decided to post one free of charge to any Aussies who asked about them. Alex
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XTRProf
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Post by XTRProf on Apr 13, 2012 4:19:09 GMT
Will has designed separate larger dual regulated PSU PCBs with adjustable output for the Class A amplifier that can take larger components, and also permit mounting to a large heatsink if required. These could be ordered as part of the GB if needed. Just remember though, with all these PCBs, small runs cost a lot more. It's the initial setting up that costs money. No, problem. Let us see what's the interest level like first. So I declare I'm interested in about 10 of such PS PCBs. So guys declare your interest to see what qty we get for a point of reference. Yeah, it's always good to keep some around even if we may not need it now. You just wouldn't know. I think a fair bet for a good pricing will be to hit at least 100 pcs. Whether go or no go, doesn't matter. Just show your interests.
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Deleted
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Post by Deleted on Apr 13, 2012 4:42:22 GMT
Chong You would need to register your interest in the 15W Class A GB area or you will miss out. Alex
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XTRProf
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Pssst ! Got any spare capacitors ?
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Post by XTRProf on Apr 13, 2012 4:58:02 GMT
You would need to register your interest in the 15W Class A GB area or you will miss out. Oh, my? I didn't read that as I'm not looking for a 15W amp. I'll be there!
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Deleted
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Post by Deleted on Apr 13, 2012 7:54:30 GMT
Hi Jon is it going to be possible to do single and double JLH? mmmmmmmmmmm Hi Greg sounds interesting will you be making the artwork available for DIY etching? i hope so as the two JLH boards you sent me where really nice to work with and are now doing sterling work in Alex's class A. Hi Shaun, Here is the current one and I will update it when the newer one is ticked off. users.tpg.com.au/users/gerskine/greg/jlh%20add-on%20shunt%20regulator.htmClick PCB then scroll down. regards
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Post by Deleted on Apr 13, 2012 8:09:24 GMT
If it's designed well it could be both. A board that includes a PUS and JUL, that can be cut, if you want them separate. Hi Xerxes, It all comes down to personal preference in the long run. I design PCB the way I like to do them. I learnt a few years ago that I can't get involved in a PCB design commitee. I don't mind offering my PCBs to others if they can live with the way I do them though. regards
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pagan
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Post by pagan on Apr 13, 2012 8:17:05 GMT
Greg If you ran a perforation down the middle of the ground plane, ., We could brake the pcb in two for either better placement or using as 2*+ or 2*-
allan
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Post by Deleted on Apr 13, 2012 23:08:15 GMT
Greg If you ran a perforation down the middle of the ground plane, ., We could brake the pcb in two for either better placement or using as 2*+ or 2*- allan Hi Allan, Sounds simple but its is not for the following reasons: - vscoring is an additional process in the PCB manufacturing process, therefore it will cost.
- When you cut the PCB in half you don't have mounting holes on one side of the board. If you decide to include extra mounting holes you have to move the terminals and redesign the ground trace. The PCB gets bigger.
- If you put a string of holes or vias down the middle of the earth plane you will get a reduction in area of the ground plane because the software automatically adds 'keep out' areas.
As a compromise, I have increased the width of the ground plane and added a dashed line to aid cutting. Personally I would not cut it in half, that is why I an designing a single version. regards
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Post by Deleted on Apr 14, 2012 0:06:14 GMT
Hi Greg I have already picked up on that,and I wouldn't cut it either. A further suggestion though. Some "purists" may like the idea of both halves of the PCBs having separate earth traces, in a situation such as feeding an external device where the earths come together at the device end. This would facilitate the use of a 4 wire cable and perhaps result in half the voltage drop across the 0 volts lines. i.e. less interaction between say a +12V line and a +5V line . This could replace the suggested cutting line.You could also provide an option to link both earths at each end ? Kind Regards Alex
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Post by jeffc on Apr 14, 2012 8:43:29 GMT
Greg, Your dual JLH PCBs are a "work of art" , thicker copper traces might be useful for higher current applications, but, layout is perfect .. repeat.. perfect !! Design a single version to the same layout, and life will be complete as far as JLHs go. Now a question, voltage remains essentially unchanged through the JLH, but I've often wondered what the current loss might be? I'm guessing small but ... I am curious . cheers.. jeffc
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Deleted
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Post by Deleted on Apr 14, 2012 8:52:51 GMT
Hi Jeff That's why I suggested to Greg to upgrade to 2oz copper. Regards Alex
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Post by Deleted on Apr 14, 2012 9:22:50 GMT
Chong You would need to register your interest in the 15W Class A GB area or you will miss out. Alex I realise I'm proving my numptyness again but it's so well established now it is no longer a problem but I've done a search and can't find the subject area so would some kind soul take pity on me and point me in the right direction please? - Your reward will be in heaven, as Granny used to say! Seiously I would like to register my interest in this GB. TIA, Dave.
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Deleted
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Post by Deleted on Apr 14, 2012 9:38:14 GMT
Chong You would need to register your interest in the 15W Class A GB area or you will miss out. Alex I realise I'm proving my numptyness again but it's so well established now it is no longer a problem but I've done a search and can't find the subject area so would some kind soul take pity on me and point me in the right direction please? - Your reward will be in heaven, as Granny used to say! Seiously I would like to register my interest in this GB. TIA, Dave. rockgrotto.proboards.com/index.cgi?board=m&action=display&thread=7461&page=23 Reply 560
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Deleted
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Post by Deleted on Apr 14, 2012 21:55:56 GMT
Greg, Your dual JLH PCBs are a "work of art" , thicker copper traces might be useful for higher current applications, but, layout is perfect .. repeat.. perfect !! Design a single version to the same layout, and life will be complete as far as JLHs go. Now a question, voltage remains essentially unchanged through the JLH, but I've often wondered what the current loss might be? I'm guessing small but ... I am curious . cheers.. jeffc Thanks for the kind words Jeff. I have already increased track widths where possible on the latest PCB, combine that with 2oz copper and it should be more suitable for higher currents. My single version is heading in a different direction and will not be considered suitable for general use. regards
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Deleted
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Post by Deleted on Apr 14, 2012 22:42:36 GMT
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Deleted
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Post by Deleted on Apr 14, 2012 23:14:31 GMT
It should be ideal for use with DACs etc. at +5V and +3.3V if a 1.4mA CRD such as the J506 is used to replace the 10K resistor .
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Deleted
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Post by Deleted on Apr 14, 2012 23:21:34 GMT
Hi Greg nice work and thanks for sharing it with us i really liked the layout of the last boards take care
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Deleted
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Post by Deleted on Apr 14, 2012 23:46:03 GMT
Hi Greg nice work and thanks for sharing it with us i really liked the layout of the last boards take care x2
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Post by unomas on Apr 18, 2012 2:32:44 GMT
Hi from Spain, This is my presentation to the forum. Thank you guys for all the good work already done! This time I have come on-time! I am quite interested in getting some of the new boards. I think Greg's design looks quite nice. Javier
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Deleted
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Post by Deleted on Apr 18, 2012 2:40:22 GMT
Hi from Spain, This is my presentation to the forum. Thank you guys for all the good work already done! This time I have come on-time! I am quite interested in getting some of the new boards. I think Greg's design looks quite nice. Javier Hi Javier Not only do they look nice, but they are a pleasure to work with, and also very forgiving of simple mistakes that require re-working. Alex
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Deleted
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Post by Deleted on Apr 18, 2012 16:26:52 GMT
Hi Javier, Welcome to the forum. As you may already know, we have another member called Javier who lives in Spain (Madrid). Enjoy your stay here - they are not a bad bunch of guys, mostly and some of them are very knowledgeable and helpful with it . Dave.
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Post by unomas on Apr 19, 2012 0:50:12 GMT
Hi Javier, Welcome to the forum. As you may already know, we have another member called Javier who lives in Spain (Madrid). Enjoy your stay here - they are not a bad bunch of guys, mostly and some of them are very knowledgeable and helpful with it . Dave. Hi Dave, Curious, I am also from Madrid. Nice to know I have a RG mate so near. Let's wait and see if the project evolve positively. Javier
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