This thread over in chip amps shows just how much wiring layout affects amplifier performance
http://www.diyaudio.com/forums/chip-amps/252436-lm3886-pcb-vs-point-point-data.html
http://www.diyaudio.com/forums/chip-amps/252436-lm3886-pcb-vs-point-point-data.html
Now back to Lateral MosFETs.
Are they all made in the same factory in Japan?
Are they all made in the same process?
Are there any Lateral mosFETs that are actually different from the sole Japanese factory versions, that are sold around the world to be packaged in different plastic/metal by a variety of assemblers?
Are they all made in the same factory in Japan?
Are they all made in the same process?
Are there any Lateral mosFETs that are actually different from the sole Japanese factory versions, that are sold around the world to be packaged in different plastic/metal by a variety of assemblers?
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I wonder where you guys get that information from?
From what I can figure out, Semelab does not disclose much information about their processes and sources. They do not offer any spice models either, i asked once = secretive bunch. The only contact I could find for them was a sales office. I did contact them, got the impression know one there was very informed or they simply did not want to disclose anything to me. maybe if i was a big customer things would be different but I am not a big player so they do not care about the small guys for sure.
Yes, I have this strong feeling for a very long time, but I couldn't prove it (until I have sufficient experiences to make an assumption, even without proof). I have many PCBs (kit) that I don't want to use. I even have several quite expensive commercial amps that I want to replace the PCB with my own.
It started with chipamps, where the same circuit is built for so many times. One pcb, no matter how much I tweaked the components, it never sounded good. In other pcb it sounded better. Initially, for years I thought it was the chip (different quality chip, or may be fake). But with experience, I got the chance to "mix and match" and found out that the only/major difference was the PCB.
I am using the info that became obvious when Japan had it's big earthquake that took out one mosFET factory.
The whole world wide supply of Lateral mosFETs completely dried up. And only became available after that factory was rebuilt.
It appeared that no other factory made Lateral mosFETs, not even Semelab in Scotland.
The whole world wide supply of Lateral mosFETs completely dried up. And only became available after that factory was rebuilt.
It appeared that no other factory made Lateral mosFETs, not even Semelab in Scotland.
It can imply anything. 2nd and 3rd paragraphs had no connection with 1st, they are to support OP with his original question/proposal that there EXIST differences between output parts or makers. (Nothing like to say that the difference is more audible than anything else).
1st paragraph is saying about bottleneck and audibility of the pcb track. If you build the pcb track like an amateur in his first time, of course, not only it will be the bottleneck and audible, but the circuit might not work AT ALL. But that's not the situation I was talking about. I was talking, for example, about every PCBs on this thread (including from Alex). It will become the bottleneck only after you do everything possible to improve the sound (without changing the circuit). About it's audibility, do you think it is audible? (May be you don't think so). So the nature of your statement about PCB layout is very subjective/qualitative.
That's funny. Coz I have only one amplifier but it sounded different through the same speaker I used. And I only changed the input transistor
Hfe, noise and input capacitance of the transistor contributes to audio quality. That's how good designers design good quality amplifier...
If the amplifier is designed right in the first place it will sound excellent.
TT Group Semelab own Semefab in Glenrothes
see Semiconductor Manufacturing, MEMS Foundry, MOS, Bipolar
As you say, they are secretive about the source of the lateral device dies.
What is clear is that laterals are effectively single sourced
I know it is strange. I just don't know what's going on...
There was a period where the Hitachi just running out of electronic shops (and price increased 6x). Some related this to Kobe earthquake. Not long after that (2 or 3 years I don't remember) I found the same transistors in abundance, in electronic shops. They were so clean, like new production. I thought, it cannot be new-old-stock, but who produced the transistors? (Years later there was the 10N and 10P parts, I think Lexicon).
I have new-old-stock Hitachis. I tried to "clean" them using several solvent but didn't workout well. You have a solution? But hey, they look macho that way
I'd take a good look at this page, and ask yourself why your next post is again strange
????????????? • ???????? ???? - ?????? ??????????? ???? ????? 1?, ??, 2? ? ??.
Don't be so hard on Jay, seems to be confused with a lot of mis-information.
IIRC Hitachi sold there semi fab capacity to Renesas, who basically have dropped many of the old products. I would not trust any Hitachi MOSFET products. Folks play into people like you to sell you fakes. If you want to design using Lat Mosfets, only use the Semelab branded parts from reputable suppliers. They seem to be the only current source of new Latfet product that I know of.
IIRC Hitachi sold there semi fab capacity to Renesas, who basically have dropped many of the old products. I would not trust any Hitachi MOSFET products. Folks play into people like you to sell you fakes. If you want to design using Lat Mosfets, only use the Semelab branded parts from reputable suppliers. They seem to be the only current source of new Latfet product that I know of.
Buy lateral Mosfet here:
Lateral MOSFET online at Profusion
They sell small quantities, well packaged. Not cheap, but hey, you'll save a lot of time and maybe even money by being sure not buying counterfeits.
Lateral MOSFET online at Profusion
They sell small quantities, well packaged. Not cheap, but hey, you'll save a lot of time and maybe even money by being sure not buying counterfeits.
I bought mine, alf16n(p)16w, from Newark, when they had them on special a few years back now.
On the subject of Latfet designs, I have done a layout of the Mark Alexander CFA amp. I bought the parts many years ago, I guess waiting for another retirement project. I did not get the Toshiba igbt devices as they were impossible for me to buy. So I think the latfets should work out okay.
Anyone interested in doing a design/layout review? I have managed to lay it out on a 100x100mm 2 layer pcb, so i can get the $13USD special deal from pcbway for 10 pieces.
Let me know if anyone is interested i will start a new thread and we can go from there. I am not interested in making any $, just the fun of designing the ckt and checking it out. I have some ssm2131 opamps and I believe my source has more if I need them, but other opamps should work as well, ie OPA604 or OPA62(3)7.
On the subject of Latfet designs, I have done a layout of the Mark Alexander CFA amp. I bought the parts many years ago, I guess waiting for another retirement project. I did not get the Toshiba igbt devices as they were impossible for me to buy. So I think the latfets should work out okay.
Anyone interested in doing a design/layout review? I have managed to lay it out on a 100x100mm 2 layer pcb, so i can get the $13USD special deal from pcbway for 10 pieces.
Let me know if anyone is interested i will start a new thread and we can go from there. I am not interested in making any $, just the fun of designing the ckt and checking it out. I have some ssm2131 opamps and I believe my source has more if I need them, but other opamps should work as well, ie OPA604 or OPA62(3)7.
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