All Hitachi Lateral Fet amplifier for DIY described by Paul Kemble - Page 33 - diyAudio
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Old 11th December 2012, 03:54 AM   #321
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Join Date: Sep 2005
Here is the promised picture from my PC boards.
Also I made several other PC board for different amps like my Darlington which include the latest mode of wahab
I want to test also from ESP the P3A amplifier, Sakis praised so much he made me curious about that amp.
Unfortunately I used up all my clad boards and now at the store cost 4X as much than last time!! Otherwise I would make a pair PC board after Alex layout to.
Any way I will order for these amplifier at least PRP or Dale resistors. Also for the other amps to.
So it will take a while (few weeks) until I test it.
I hate to desolder the cheap parts and use the same board again and again.
Specially I use silver solder, very hard to work with, need high temperature for melting.
The boards need to be stained, drilled, cut into size etc.. Was made with hot iron transfer method.
Greetings Gabor
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Old 11th December 2012, 04:08 AM   #322
Junie is offline Junie  Philippines
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Location: Dubai, UAE
Quote:
Originally Posted by alex mm View Post
......
Thank you Alex!
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Old 11th December 2012, 04:40 AM   #323
wahab is offline wahab  Algeria
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Join Date: Nov 2009
Location: algeria/france
Quote:
Originally Posted by alex mm View Post
......
Thank you for this final revision , Alex , it will be of great
help for whom wants to build a definitively pro looking amp
even inside the box...

Quote:
Originally Posted by gaborbela View Post
Here is the promised picture from my PC boards.
Also I made several other PC board for different amps like my Darlington which include the latest mode of wahab
I want to test also from ESP the P3A amplifier, Sakis praised so much he made me curious about that amp.
Unfortunately I used up all my clad boards and now at the store cost 4X as much than last time!! Otherwise I would make a pair PC board after Alex layout to.
Any way I will order for these amplifier at least PRP or Dale resistors. Also for the other amps to.
So it will take a while (few weeks) until I test it.
I hate to desolder the cheap parts and use the same board again and again.
Specially I use silver solder, very hard to work with, need high temperature for melting.
The boards need to be stained, drilled, cut into size etc.. Was made with hot iron transfer method.
Greetings Gabor
Great work , Gabor , this is very net.

The compact components placement and subsequent routing
is instrumental in a high NFB amp and in this respect this PCB should
be optimal , the only influence it will have on the caracteristics
goes in the right direction by the way..

Simulations show very promising perfs and (without wanting to boast around
this design, i simulated almost all the amplifiers that are running in this forum
as well as scores of commercial offerings) as a result only a few commercial designs or Edmond s PGP are as good or better on a global estimation , the latter thanks to its use of Bob Cordell s error correction circuitry , wich if applied to this amp would bring it very close.

Given how much energy and means you did spend to build numerous amplifiers
i really hope that this one will be good enough to supersede your previous tries and provide you with a high performing unit up to current audio standards.

Last edited by wahab; 11th December 2012 at 04:57 AM.
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Old 11th December 2012, 06:10 AM   #324
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Join Date: Sep 2005
Hello
Thank you wahab!
Knowing that makes me feel good about these project. I have good parts (heat sink, PS caps, transformers, enclosure, wires etc.
Only I have to get the transistors, resisters, diodes & some small parts.
I will build these amp (I put my heart) after my best ability. I want to visit the local store before I would order from Mouser or Digi-key. VAS & cascode transistors.. If I need just resister I order those from parts connexion.
Also I have to make a list because with one order I want to get all the parts I need for the other amps to.
I tested before the PRP resister against the Dale I like the PRP a bit better but it cost almost 2X as much.
In my favorite Darlington I used 1/4W resister after I burn the PC board to I started to take out the resisters and other parts.
Because the silver solder melt second time so badly I broke several resister.
I do not buy or use 1/4 resister anymore.
Only 1/2W of course where I need 2W or 5W that will be used.
I have Wonder solder to with that easy to work but nothing wonder (special) about!
To me only wonder about how they take the money out of people pocket with that solder.
Now Alex posted the final version of his layout. Thank you ALEX - Multumesc!
I do not see any reason people not to give a try these nice amplifier!
My picture is not just the quality of the PC board. I made the picture late evening at bad light ...

Greetings Gabor
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Old 11th December 2012, 06:28 AM   #325
Junie is offline Junie  Philippines
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Location: Dubai, UAE
Gabor, this will be my project for next year, i don't have a mosfet amp yet so i will consider to build this amp :-)
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Old 11th December 2012, 09:29 AM   #326
loek is offline loek  Netherlands
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Join Date: Feb 2005
Location: The Hague
Well done Alex and Junie and Wahab! Greetings, Loek
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Old 12th December 2012, 01:00 AM   #327
wahab is offline wahab  Algeria
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Join Date: Nov 2009
Location: algeria/france
Quote:
Originally Posted by gaborbela View Post
[/U][/B] I have good parts (heat sink, PS caps, transformers, enclosure, wires etc.
Only I have to get the transistors, resisters, diodes & some small parts.
I will build these amp (I put my heart) after my best ability. I want to visit the local store before I would order from Mouser or Digi-key. VAS & cascode transistors.. If I need just resister I order those from parts connexion.
Also I have to make a list because with one order I want to get all the parts I need for the other amps to.
I tested before the PRP resister against the Dale I like the PRP a bit better but it cost almost 2X as much.

Because the silver solder melt second time so badly I broke several resister.

I have Wonder solder to with that easy to work but nothing wonder (special) about!
To me only wonder about how they take the money out of people pocket with that solder.
Hi Gabor ,

Set apart the transistors , all the rest has no specifical requirements , standard quality
resistors and caps will be enough and expensive parts will bring nothing , so just use
whatever you have already at hand...

As for solder , i doubt that silver solder is of great advantage ,rather the contrary
given that it stress the components while the soldered point contact
can even be less good due to eventual uncomplete melting.

The points with high current rating , only the mosfet drains , sources
and sources resistors can have the components tails bended horizontaly
to stick with the copper tracks and then soldered , this will provide a contact
good enough even with standard solder , the only drawback is more difficulty
to unsolder such points although not using silver render the thing easier.
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Old 12th December 2012, 11:53 AM   #328
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Join Date: Sep 2005
Hello
Thank you wahab
Last 5-6 years I only use min. DALE resisters or better. To buy cheap Yageo resisters and after order PRP that would be an extra cost.
Also I would mess up the PC boards to remove those cheap resisters (not to cheap the 1% 15 Cent /each.
The PRP 45Cent..
I will order resisters because I need for other project to.
I have at home good capacitors Nichicon KG, Elna Silmic, Cerafine, Black gate but that only 680uF..
I do like to use lead-free (96% thin, 3% silver,1% copper)solder, I already has that, just not easy to re melt once it was used.

Greetings Gabor
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Old 12th December 2012, 12:25 PM   #329
Account disabled at member's request
 
Join Date: May 2006
Quote:
Originally Posted by wahab View Post
Thank you for this final revision , Alex , it will be of great
help for whom wants to build a definitively pro looking amp
even inside the box...



Great work , Gabor , this is very net.

The compact components placement and subsequent routing
is instrumental in a high NFB amp and in this respect this PCB should
be optimal , the only influence it will have on the caracteristics
goes in the right direction by the way..

Simulations show very promising perfs and (without wanting to boast around
this design, i simulated almost all the amplifiers that are running in this forum
as well as scores of commercial offerings) as a result only a few commercial designs or Edmond s PGP are as good or better on a global estimation , the latter thanks to its use of Bob Cordell s error correction circuitry , wich if applied to this amp would bring it very close.

Given how much energy and means you did spend to build numerous amplifiers
i really hope that this one will be good enough to supersede your previous tries and provide you with a high performing unit up to current audio standards.
The problem with this amp is it doesnt have THD. Its highish THD and the spectrum of that THD that makes people like or dislike an amp.
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Old 12th December 2012, 10:50 PM   #330
wahab is offline wahab  Algeria
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Join Date: Nov 2009
Location: algeria/france
Let s say that it has not enough of it , but this can be easily "cured"
by driving it with a unity gain SET stage whose distorsion will be reproduced
quasi undistorted....
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