Will
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Post by Will on Jul 7, 2012 8:37:17 GMT
No problem! PCB is 71mm x 80mm Caps are: input filter 30mm diameter, 10mm pin pitch, output cap 3.5mm pin pitch, 8mm diameter. A full bom is coming soon. PCB is 136mm x 90mm Bom also coming soon!
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Will
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Post by Will on Jul 7, 2012 8:41:36 GMT
Thanks for the confirmations!
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Post by jeffc on Jul 7, 2012 10:13:47 GMT
Hi Phil, I have 2 x dual GE JLHs here that Alex sent as replacements for those sent previously that I nicked for my computer audio set-up. That said, Alex and I have discussed close positioning of JLHs to the PSU inputs on either side of the amp PCBs, for which the single JLHs will be more ideal, so def get some to leave options open. I plan to get a few more too as you never know where you'll find a good home for one. I have one in use now inserted between a 24V SLA battery supply and a little tube-opamp buffered HA kit I've been playing with, and although you'd expect batteries to provide a nice quiet supply, for whatever reason, it has lifted SQ of this little HA into awesome territory . Mind Frans has helped me very generously with other mods to help improve some of its several technical limitations. cheers.. jeffc
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Post by jeffc on Jul 7, 2012 10:15:11 GMT
Wow Will, Well done ... cheers.. jeffc
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Post by Deleted on Jul 7, 2012 11:29:45 GMT
Yay! It's all looking very real and immanent now. Well done Will
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Post by Deleted on Jul 7, 2012 20:58:37 GMT
Hi guys, Not knowing much about anything I've tended to ignore this thread as going over my head but Will has just made me aware of it. Always being in the market for a bargin' would someone be kind enough to briefly tell me what you guys are doing here? Do I understand that some form of not-too-expensive fancy amp(s) are being DIY'd here as I just might be interested in joining in . In layman's terms would be preferred please, if I get lucky . Dave.
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Will
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Post by Will on Jul 7, 2012 21:13:06 GMT
Hi Dave, The amp we are going to build is an 'improved' version of an existing design from over in Australia. What makes it special is that Alex has worked his magic, finding improvements, refinements and changes to the original design, which we are lucky enough to benefit from. The end result is that we'll end up with a top-rank 15W class A speaker amp. It's more involved than normal kits, with a lot more of your own thinking needed. If you look back through the thread, you'll see that Alan and Shaun have gone the route of etching their own pcbs to make the amp, and have been delighted with the results. If you give us an idea of what you've made, then we could advise accordingly. Have a look through the 'SC Class A' thread rockgrotto.proboards.com/index.cgi?board=m&action=display&thread=3977 which is the headamp version of the amp in this thread, and then have a read through this thread. As part of the build, we'll be getting some JLH ripple eaters in, which I know you've been after. If you feel you can have a crack at it, then it'd be great to have you along for the ride!
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Post by Deleted on Jul 7, 2012 21:31:37 GMT
Hi Will, Thanks for the info, just what I needed . Your faith in my DIY abilities is sadly ill-founded - I barely know one end of a soldering iron from another and my soldering skills are virtually none existant - the same applies to my schematic reading skills. I do however have a friend who is an ace at all that and would put everything together for me, at a price, so I need to think about the all up cost/benefit ratio. I'll plough through the link you gave me and this earlier thread but consider me 'out' in the meantime. Regarding the JLH RE PCBs, another forum friend was able to help and I now have enough for my foreseeable needs, but thanks for the thought. Cheers, Dave.
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Post by Deleted on Jul 8, 2012 14:38:15 GMT
Hi Guys, I've discussed with my builder briefly and I am interested enough at this stage to ask to be tentatively or provisionally included in the GB but it may be some time after taking receipt of the BOM items that my project actually goes ahead. The potential 'killer' for me could be the cost of the cases so I will confirm or otherwise when we have a 'grip' on what the case cost is likely to be. Please let me know if this is acceptable or not at this stage, but no hurry to do so . Dave.
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Will
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Post by Will on Jul 13, 2012 20:30:46 GMT
Hi Dave, I'll be requesting monies in the next few days, so you'll have to be quick in making your mind up Get your mate to look through the threads and have a think over it. If he's done a fair bit of DIY, I would guess that this build could be pretty straightforward for him. As for yourself, as long as you are happy taking a voltage reading and tweaking a pot, you'll be fine when it comes to making sure this amp is running properly in your home.
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Will
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Post by Will on Jul 13, 2012 20:35:51 GMT
Okey Doke - state of play as of today - hope I've got the numbers right!?
PCB's
Chris - CONFIRMED - 4 Amplifier boards and 4 PSU boards Syd - CONFIRMED - 2 Amplifier boards and 2 PSU boards Phil - CONFIRMED - 2 Amplifier boards, 2 PSU boards and 4 JLH's Will - CONFIRMED - 4 Amplifier boards and 4 PSU boards Mark (cyteen) - CONFIRMED - 2 Amplifier boards and 2 PSU boards Jon C - CONFIRMED - 2 Amplifier boards and 2 PSU boards Shaun - CONFIRMED - 2 Amplifier boards and 2 PSU boards Geoff - CONFIRMED - 4 Amplifier boards and 4 PSU boards Alex - CONFIRMED - 2 Amplifier boards, 2 PSU boards and 2 JLH's Alan - CONFIRMED - 2 Amplifier boards Jeff - CONFIRMED - 2 Amplifier boards, 2 PSU boards and 5 JLH's Dave - CONFIRMED - 2 Amplifier boards, 2 PSU boards and 4 JLH's
Chong 10 x PSU boards - CONFIRMED -16 PSU boards
I'll post prices over the next couple of days.
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Will
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Post by Will on Jul 13, 2012 21:17:38 GMT
I'll look at the LS device GB after we have the PCB's on the way, as that will be pretty straight forward to do.
As my evenings when working away are pretty open, matching a batch of NJE output transistors is a distinct possibility. Future Electronics are pretty cheap, so buying a decent sized pool to match from might be beneficial. Would most of you guys be interested?
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Post by Spirit on Jul 13, 2012 21:29:38 GMT
I'm up for getting a decent sized batch for matching. What package are we after for the LS devices? There's no Australian distributor, but they can be purchased direct from LS.
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Will
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Post by Will on Jul 13, 2012 21:36:11 GMT
Hi Phil,
The package we are using is either to-71 or to-78. The pcb is sized for the to-78 only on this pcb (the class A ha had both) but either package will fit this.
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Post by Deleted on Jul 13, 2012 21:45:05 GMT
Hi Will, Tentatively I'm up for participation. My builder has all and more of the capabilities needed and I'm certanly capable of the bit that I would be called upon to do . Much will depend on price though but I don't expect the PCBs to break the bank. To save me wading through all the thread would I be right in assuming that to get myself one working set of kit I would need 2 PSU boards, 2 Amp boards and 2 JLH boards? I so, please put me down for those please. Cheers, Dave
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Post by jeffc on Jul 13, 2012 22:11:14 GMT
Hi Will, Like Phil, I'm fine for contributing extra for additional power transistors to find matched pairs, makes more sense waste-wise than us all having to do similar. Plus..... think of the enjoyment you'll get from those "bingo, these match" moments . cheers.. jeffc
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Post by Deleted on Jul 13, 2012 22:46:50 GMT
^^^^^^^^^^^ Yep, seems logical to me too and many thanks for taking it on It was those working-away-evenings that first roused my interest in portable audio, mini-disc back then
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Post by Deleted on Jul 13, 2012 22:51:49 GMT
Hi Will I'd certainly be interested. Only to make sure you're not bored at night, of course Syd
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Will
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Post by Will on Jul 14, 2012 9:01:05 GMT
Hi Guys, You are all very kind in making sure that I'm not bored when working away! It is a pain, especially as I'm unable to use eagle or the internet much during the week. One upside is that a box full of blank pcbs and components turn into built pcbs, ready for use - and that I've not set off the fire detector in the hotel with my soldering! One nice break from the routine last week was meeting up with Jon Clancy for a drink and a chat, as he was in the area! Always good to put a face to a name and a good evening Righty then, I'm thinking about getting the parts from Future Electronics, who I've used before. uk.futureelectronics.com/en/Technologies/Product.aspx?ProductID=NJW0281GONSEMI1458298&IM=0uk.futureelectronics.com/en/Technologies/Product.aspx?ProductID=NJW0302GONSEMI3680899&IM=0Once we know what number we are looking at, I'll also look at the pricing on the ONsemi site. From the list so far, NJW output device GB
Will - 2 pairs matched Chris - 2 pairs matched Jeff - 1 pair matched Phil - 1 pair matched Mark - 1 pair matched
This is a starter, and we can add as and when.
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Will
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Post by Will on Jul 14, 2012 9:14:11 GMT
Hi Will, Tentatively I'm up for participation. My builder has all and more of the capabilities needed and I'm certanly capable of the bit that I would be called upon to do . Much will depend on price though but I don't expect the PSUs to break the bank. To save me wading through all the thread would I be right in assuming that to get myself one working set of kit I would need 2 PSU boards, 2 Amp boards and 2 JLH boards? I so, please put me down for those please. Cheers, Dave Hi Dave, You're pretty much there, the only difference is you'll need 4 JLH's (2 per channel). Also, unless your builder wants to match loads of transistors for hfe and vbe, then getting 4 of the LS dual transistors (about £5.30 each) is a good idea. We are doing a GB for those on this thread in due course. It is a dear do up front, but it's wotrh it. I've popped your pcbs on the pcb GB list.
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Post by Deleted on Jul 14, 2012 9:17:12 GMT
Hi Will Greg, Geoff and myself hope to be be enjoying another meal with Jon on Monday afternoon, after a brief stopover at my place for a quick listen. Greg and Geoff may even tempt Jon into a few drinks in the evening too. I will be sending some 3.3V Zeners back with Jon for those who are having difficulty obtaining them.
Kind Regards Alex
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Post by Deleted on Jul 14, 2012 9:23:10 GMT
Jon should soon be able to tell you if it is, or not.
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Will
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Post by Will on Jul 14, 2012 9:28:40 GMT
Hi Will Greg, Geoff and myself hope to be be enjoying another meal with Jon on Monday afternoon, after a brief stopover at my place for a quick listen. Greg and Geoff may even tempt Jon into a few drinks in the evening too. I will be sending some 3.3V Zeners back with Jon for those who are having difficulty obtaining them. Kind Regards Alex Jon said he was looking forward to meeting up with you all again, only a bit jealous that I can't come a meet with you lot as well!
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Post by Deleted on Jul 14, 2012 12:14:30 GMT
Hi Dave, You're pretty much there, the only difference is you'll need 4 JLH's (2 per channel). Also, unless your builder wants to match loads of transistors for hfe and vbe, then getting 4 of the LS dual transistors (about £5.30 each) is a good idea. We are doing a GB for those on this thread in due course. It is a dear do up front, but it's wotrh it. I've popped your pcbs on the pcb GB list. Thanks Will, I'll go with all the recommendations you make, across the board, so please add the extra 2 JLH REs and the 4 pieces of LS dual transistors. This is going to be a bit of an adventure for me but, being a Yorkshireman, I do like the idea of getting value for my money and it sounds like this should be just the job . Thanks for all your tolerance and help. Dave.
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Post by Deleted on Jul 14, 2012 14:23:19 GMT
Hi Guys, Anybody got any ideas on casing for these amps? I am aware of L x W from Will's post above but what sort of height would be needed to accomodate the tallest item and anything that 'hangs' underneath? Also, for the unitiated like me, each channel will involve 4 PCBs, (1 PSU, 1 Amp and 2 JLH REs) but how many cases will be needed, 1 for each PCB or can some PCBs be put in the same case? No hurry for an answer, jus thinking ahead . TIA, Dave.
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