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Old 28th November 2009, 12:19 PM   #11
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Hi Ed,
Sounds like a good idea, and now it is possible since the output terminals are located in the middle of the board.

My family is going through a rough patch right now, my workplace is going to close in about ½ year, and after that I will be looking for new work..... It sucks, we have a great team but we are "too expensive" compared the Chinese (no offence) Not sure how that conclusion has been made, but I suspect that it is more an effort to please the share holders than based on actual experience. Where I'm located, outsourcing is a big buzz word, and outsourcing is a sure success (if you ask management)

Oh well….. I guess this is just a matter of time, before the Chinese industry will be comparable to European when it comes to pricing pr. hour…. maybe then all R/D will move somewhere else?


Last edited by JensRasmussen; 28th November 2009 at 12:22 PM.
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Old 28th November 2009, 02:54 PM   #12
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It would be nice if you could market your designs on the web. These are proven practical amplifiers with years of hard use as proof.
It would just need the good Doctors o.k.

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Old 29th November 2009, 01:58 PM   #13
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I would be interested in 2 boards.
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Old 29th November 2009, 03:12 PM   #14
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Moved to group buys.
planet10 needs your help:
Let's help Ruth and Dave
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Old 30th November 2009, 06:35 AM   #15
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I am ready for 3 boards - Michael
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Old 30th November 2009, 06:42 AM   #16
Electrons are yellow and more is better!
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It seems that there is a market for a group buy. Maybe someone should put up a wiki page? I can do that if you want.
/Per-Anders (my first name) or P-A as my friends call me
PA03 LM4780 amplifier group buy, SIGN UP HERE for the group buy 0 boards left. 118 paid.
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Old 30th November 2009, 08:24 AM   #17
Loboone is offline Loboone  New Zealand
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Put me down for three please.

I need something to put the other "19" MJL4302's and MJL4281's left over from my "Leach 6". That is if I don't blow them up when I finally fire her up soon!!! Man it has been a long build.

Can I assume that the other group buy / redesign etc we were talking about died a natural death and this is starting from fresh?

Jfet front end sounds interesting!


P.S. Sorry to hear about the job thing Jens. As my wise old aunty say's "it will all work out right in the end." And she sould know. We recon if she fell down the toilet she would come out with a box of chocolates!!!
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Old 30th November 2009, 10:39 AM   #18
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If you put up the wiki page I will be glad to run the group buy if it gets to a decent number of boards.
I really like that 12 output snap off board idea. Could easily run 85 volt rails for a nice 300 plus amp. I sense a Christmas time group buy. I am in for 4 boards myself.

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Old 30th November 2009, 11:03 AM   #19
AndrewT is online now AndrewT  Scotland
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I like the new layout with the main ground and speaker out in the middle. Much closer to the +ve & -ve feeds.
I see you have kept the three 0.1inch pitch inputs. A great idea that covers many options without wasting PCB space. I do wish others would copy this.

jFET input stage !!
Could space be found for a full two transistor cascode? Rather than the single transistor that Leach did?
regards Andrew T.
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Old 30th November 2009, 12:18 PM   #20
400 is offline 400  Germany
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I think, I am in with 2 or 3 pcbs. Especially, if it will be a high power version (12 transistor version).
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