All Hitachi Lateral Fet amplifier for DIY described by Paul Kemble - Page 30 - diyAudio
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Old 3rd December 2012, 12:20 AM   #291
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Hello
I just printed out the modified layout.
I implemented to the layout Q20 and 2PC capacitor which was added last week or before by wahab.
Also I added Source resisters so I can measure the bias on each mosfet.
Because these mode the PC board size changed a bit.
The right size 176 x 76mm.
Open the last posted layout with the paint program, use page set up 86% and print.
The mean time please get read of all the colored marks on the layout.
I'm more than happy how these layout came out.
Also the Alex layout is more excellent if someone want professional PC boards I advise please use that. If we would org. a GB I would use that to, but I can't wait, I would like to test these amp ASAP.
I thought it will be more interest on these great amp but that will not hold back to go on and build it.
I had 80% the necessary parts for the amplifier.
Also I was interested on the Goldmund clone on that time but a lot of think was very expensive, including the PC boards.
Thank God I didn't wasted my money and energy on that amplifier.
After the sim these amp performance way better, and no expensive parts req.>>>>
A big thank you to wahab!
Tomorrow if the rain stop I want to make the laser copy so I can stat to fabricate my PC boards.
The amp with these rail voltage and biased to 300mA/channel will know more than 100W VMRS..
That is enough for home use with any speakers.
By the way very likely I will have a 39-0-39 600VA transformer for these project, but only available after I tested my amp. Price will be $60 cash..You can ad 2x3M winding for the LC voltage...That is what I did with my transformer to these project.
Greetings Gabor
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Old 3rd December 2012, 12:45 AM   #292
The Dastardly Dad of Three
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Quote:
Originally Posted by wahab View Post
Also , i replaced the two diodes connected in parralel with C4
by two random transistors wich are used as diodes , each one
having its base connected to its collector , no need to update
your PCB since theses pins can be connected together directly.
Please excuse my ignorant question - but what is the purpose of the two diodes here ? I tried reading the previous posts but may have missed the explanation when the diodes were introduced.. Many thanks!
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Old 3rd December 2012, 04:22 AM   #293
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Hello
Originally it was two diode here and those were replaced by two BJT..
I marked on the schematic
Greetings Gabor
Attached Images
File Type: gif HITACHI%20FFET%20MOD5_5%20SCH 1.gif (20.8 KB, 328 views)
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Old 3rd December 2012, 05:07 AM   #294
wahab is offline wahab  Algeria
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Quote:
Originally Posted by kasey197 View Post
Please excuse my ignorant question - but what is the purpose of the two diodes here ? I tried reading the previous posts but may have missed the explanation when the diodes were introduced.. Many thanks!
Actually they have no role if the amp work normaly , it s just in case
of failure , if ever the output goes to a rail voltage wether it s due
to a mosfet going short circuit or a rail that would be switched off ,
the consequence would be to have the gate being biaised with
a full rail voltage , hence the diodes to limit the eventual high DC
gate/source voltage.
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Old 3rd December 2012, 05:21 AM   #295
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Gabor, I certainly want to try this amp;Regarding the MSK1058 and the MSJ162 where can I get these or may I use other brands too?
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Old 3rd December 2012, 06:04 AM   #296
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Hello
Those are 2SJ162 & 2SK158... You can get these any distribuitor like Mouser, Digikey etc. On ebay you can find also but I would advise buy those from large distributors to avoid counterfeit chips.
Also you can use Exicon laterals from Profusion..
Greetings Gabor
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Old 3rd December 2012, 07:16 AM   #297
The Dastardly Dad of Three
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Quote:
Originally Posted by wahab View Post
Actually they have no role if the amp work normaly , it s just in case
of failure , if ever the output goes to a rail voltage wether it s due
to a mosfet going short circuit or a rail that would be switched off ,
the consequence would be to have the gate being biaised with
a full rail voltage , hence the diodes to limit the eventual high DC
gate/source voltage.
I understand now - thank you for the explanation.
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Old 3rd December 2012, 03:42 PM   #298
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Quote:
Originally Posted by gaborbela View Post
Hello
Those are 2SJ162 & 2SK158... You can get these any distribuitor like Mouser, Digikey etc. On ebay you can find also but I would advise buy those from large distributors to avoid counterfeit chips.
Also you can use Exicon laterals from Profusion..
Greetings Gabor
I've the 2SJ162 and 2SK1058 from Renesas and for my FetZilla I did use these
ALF08N20V and ALF08P20V
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Old 4th December 2012, 10:49 PM   #299
wahab is offline wahab  Algeria
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Quote:
Originally Posted by gaborbela View Post
I just printed out the modified layout.
I implemented to the layout Q20 and 2PC capacitor which was added last week or before by wahab.
I made some sims to check the influence of this PCB routing for the most critical tracks at least , and your layout is well done electricaly speaking , it has no negative influence for the amp stability.

Quote:
Originally Posted by gaborbela View Post
I thought it will be more interest on these great amp but that will not hold back to go on and build it.
I had 80% the necessary parts for the amplifier.
The design looks quite complexe and whoever has not great experience in the domain will see it as a difficult to make work while in fact it is supposed to settle at first power on with no other thing to do that setting the bias and eventualy the DC offset.

Also , components prices and availability can be problematic.

Set apart the laterals , wich are not replaceable , the input stage cascodes can be replaced with 2N5551 or BF469/471 if 2SC3423 are not easy to source.

The VAS 2SA992s can be replaced by BC560C but when it comes to the rest of the VAS the 2SA1360/2SC3423 are among the components of choice although BF469/470 or 471/472 would work as well.

Quote:
Originally Posted by gaborbela View Post
The amp with these rail voltage and biased to 300mA/channel will know more than 100W VMRS..
That is enough for home use with any speakers

[B]By the way very likely I will have a 39-0-39 600VA transformer for these project, but only available after I tested my amp.
It should reach this power even if a single +-55V psu is used for both the front end and the power stage.
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Old 5th December 2012, 08:29 AM   #300
loek is offline loek  Netherlands
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Quote:
Originally Posted by alex mm View Post
....... was obliged with PCB in black and white . Here are files in .pdf form .
Alex.
Hi Alex. I hope not to disturb you but i found a small mistake in your beautifull layout: the right side of D3 goes via R0 to E of Q20 but has to go to the base of Q7, this is not connected now.
Regards, Loek
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