All Hitachi Lateral Fet amplifier for DIY described by Paul Kemble - Page 29 - diyAudio
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Old 28th November 2012, 07:41 PM   #281
alex mm is offline alex mm  Romania
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Default Last rev 4.5

....... It's the last PCB layout here on this forum , I will not layout anymore .... sorry for that , but for me was enought .....all I done was , layout in wrong way , so I let experts to do this job .
Alex.
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File Type: jpg wahab pcb rev 4.5.jpg (1.05 MB, 351 views)
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Old 28th November 2012, 07:57 PM   #282
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by alex mm View Post
If I have forget something please tell me what to do ......or not ,to do.
Alex.
sorry to hear you say it feels like that now
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Old 28th November 2012, 08:37 PM   #283
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Alex I can't imagine if there is anyone on the forum who would not appreciate your work!
You know who make mistakes- those people who do something!
If I lay all day on the bed that 100% sure there will be no mistake.
I follow many of your art work and all I can say you are great, fast, gifted and very helpful.
Good to have someone like you here at the forum, is a real blessing to us.
The work you done it is not EASY, even do sometimes look a like but is not at all.
And these amplifier board because one sided, and dual PSU one of the most difficult I have done..
I made several PC boards but these needed a lot of focus, attention, energy etc
Please take a day or two and relax after you will feel different.
To be honest you work way to fast and sometimes that make you tired and loose you patient etc
Alex from the bottom of my heart thank you for your help!!!
Greetings Gabor
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Old 29th November 2012, 11:37 PM   #284
wahab is offline wahab  Algeria
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Quote:
Originally Posted by alex mm View Post
....... It's the last PCB layout here on this forum , I will not layout anymore .... sorry for that , but for me was enought .....all I done was , layout in wrong way , so I let experts to do this job .
Alex.
Right that continual mods in many designs is time consuming , perhaps
you should wait for all projects to be mature before doing a PCB of your own..

Neverless , this last version is great for people who wants no compromise aestheticaly speaking , so thank you for the efforts.

I repost this PCB as there s a missing track for eventual builders.


Quote:
Originally Posted by gaborbela View Post
Here is my test board so called "art work"
I upgrade it up to the last mod, I ad the Q20 and the two C12/13 caps.
Since all hand drawn on my computer paint program I do not have silkscreen like Alex who is great and talented with software design.
I did tried one time to use some free software, I didn't succeed so I keep draw my layout by hand.
These is hot iron transfer friendly at least...
Alex design is so beautiful I would pay to get it on a professional made PC board.
Great board as well , Gabor...

I like the compacity of this PCB, yet with all options..

That said , since the laterals have no source resistors , if ever
you want to check the devices individual iddle currents you ll have
to solder only gate and drain on the PCB and solder the sources
from tip of the pins to PCB using 0.22R resistors.
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File Type: jpg wahab pcb rev 4.5.jpg (996.0 KB, 289 views)
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Old 1st December 2012, 12:12 PM   #285
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Hello
I did listen to your advise and I modded my layout. Now I have Source resisters to.
The PC board got bigger about 8mm but I think it is good to have those resisters
All do I read it degrade the sound a bit but there is a lot of advantage to to have them
Help a bit when not 100% matched the power mosfets. I can measure the bias on each mosfet etc.
So Monday I will go to laser printing to do the PC board to these amp and the Darlington also.
All the components remain the same place accept those now marked on the PC board..
Greetings Gabor
Attached Images
File Type: bmp Hitachi amplifier layout w. Source Res.bmp (96.5 KB, 74 views)

Last edited by gaborbela; 1st December 2012 at 12:16 PM.
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Old 1st December 2012, 12:19 PM   #286
alex mm is offline alex mm  Romania
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....... was obliged with PCB in black and white . Here are files in .pdf form .
Alex.
Attached Files
File Type: pdf PCB ALL GREY.pdf (174.8 KB, 115 views)
File Type: pdf PCB BOTTOM VIEW.pdf (49.5 KB, 95 views)
File Type: pdf PCB SILK TOP MIRROR.pdf (123.5 KB, 75 views)
File Type: pdf PCB SILK TOP.pdf (123.6 KB, 69 views)
File Type: pdf PCB TOP VIEW.pdf (49.7 KB, 88 views)
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Old 1st December 2012, 12:40 PM   #287
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Alex thank you very much.
I hope you still be on the forum, you are not just a great layout designer but a great friend to!
We didn't ask you please make these PC board and you came (moved by love) to help on us.
I appreciate that from the bottom of my heart.
I hope we still meet you time to time and you would not give up your hobby.
Over all the PC board lay out came up very nice and great..
Thanks/ Multumesc!
Greetings Gabor
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Old 1st December 2012, 11:46 PM   #288
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Hello

I would like to know how many people would be interest on PCB GB using the Alex nicely designed layout..
In case you interested please post your interest.
I never org. BG but I did ordered PC boards for the Symasym
Any one who has more experience on PC board order (for good price) or organising a GB please feel free to take charge!
Probably I will use my own layout for the amp, specially if there will be low interest on these project.
I see several Hitachi fet amplifier on the forum now... Probably not the best time when wee came up with these amp.
But again please take a look the sim. result, also the amp was compared with the famous Gold-Mound Min. and on paper well out perform that amp!
The sim result can be found a few page back..
Thanks one more time to wahab for helping me to put such a great circuit together.
Donpetru wee wait on you promised design...
Also if someone want to use my lay out I will give all the necessary help so you can put together these project.
Just let you know I designed several PC board with out any issue.
Again I would advise to use the professionally made Alex layout!!
Greetings Gabor
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Old 2nd December 2012, 07:12 AM   #289
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Quote:
Originally Posted by ashok View Post
Donpetru's variation is an offshoot of this design. So it should stay here as it will be compared with the original circuit. I don't see any harm in his circuit being here and actually think it's better here for evaluating differences.
I don't see how the hexfet's can 'sound' any better but it would be interesting to keep the progress and results within this thread . We would want comparative listening tests . Without that all of this will just be a theoretical exercise. It does make the thread even more interesting !
I think I'll open a new topic whose name will be the name of the new amplifier.
I will briefly name the new amplifier DW300 or DWG300 - I'll think about it.

Quote:
Originally Posted by gaborbela View Post
Hello
Donpetru wee wait on you promised design...
I'm still working on PCB. There will be a single PCB, but something more special. You will see at the right time (ie next week).
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Old 2nd December 2012, 09:02 AM   #290
masood is offline masood  India
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dear alex mm,
you are my friend dont loose your temper plz.stay in the forum and pardon all those who comment on youthanks with best regard masood
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