All Hitachi Lateral Fet amplifier for DIY described by Paul Kemble - Page 21 - diyAudio
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Old 21st November 2012, 09:04 PM   #201
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Hello

Sorry guys I was out for a couple weeks. Now I feel better so back to the project.
I'm looking to get the right transfer paper (from Staples) because I run out of them.
After I will do the PC boards and I will start test the amp. I think I will order PRP resistors that is a great match to the Hitachi laterals..
Thanks for your patient.
Greetings Gabor
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Old 22nd November 2012, 10:18 PM   #202
alex mm is offline alex mm  Romania
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..... another kind of PCB acording to schematic from post #194
Regards Alex.
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File Type: jpg PCB WAHAB.jpg (940.9 KB, 310 views)
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Old 22nd November 2012, 10:29 PM   #203
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Nice job, Mr. Alex.
Please.... SCHEMATIC WAHAB or SCHEMATIC GABOR?
Thanks!
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Old 22nd November 2012, 10:50 PM   #204
tinitus is offline tinitus  Europe
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nice looking board
but not sure I would like to mount the output transistors like that on a heatsink

and speaker out placed so close to the power supply lines/connectors, is that good ?
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Old 22nd November 2012, 11:50 PM   #205
wahab is offline wahab  Algeria
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Quote:
Originally Posted by gaborbela View Post
Hello

Sorry guys I was out for a couple weeks. Now I feel better so back to the project.
I'm looking to get the right transfer paper (from Staples) because I run out of them.
After I will do the PC boards and I will start test the amp. I think I will order PRP resistors that is a great match to the Hitachi laterals..
Thanks for your patient.
Greetings Gabor
Hi Gabor ,

Hope all is well for you.

As for special resistors , just take regular non inductive ones ,
expensive parts are useless by the way , most of the perfs
are active components dependents.

Quote:
Originally Posted by alex mm View Post
..... another kind of PCB acording to schematic from post #194
Regards Alex.
Nice board , Alex.
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Old 22nd November 2012, 11:54 PM   #206
wahab is offline wahab  Algeria
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Quote:
Originally Posted by smartx21 View Post
Nice job, Mr. Alex.
Please.... SCHEMATIC WAHAB or SCHEMATIC GABOR?
Thanks!
It is on post 194 but neverless here it is again.

Click the image to open in full size.
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Old 23rd November 2012, 01:49 AM   #207
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Is C6 across R16 for stability ? Should introduce a zero in the OL gain?
And R33 (10K) does go to the output node and not to the + supply rail ?
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Last edited by ashok; 23rd November 2012 at 01:52 AM.
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Old 23rd November 2012, 02:21 AM   #208
wahab is offline wahab  Algeria
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Quote:
Originally Posted by ashok View Post
Is C6 across R16 for stability ? Should introduce a zero in the OL gain?

Yes , it slightly extend the unity gain frequency from 15.5Mhz to 18Mhz
but the most valuable change is efficient reduction of the phase lag
at thoses frequencies.

Quote:
Originally Posted by ashok View Post
And R33 (10K) does go to the output node and not to the + supply rail ?
You can see that R33 is an AC coupling only , from power output to the inverting input of the VAS to create a local feedback loop that act only at audio frequencies and wich is quite efficient in output stage THD reduction as extensively explained by Edmond Stuart in his insightfull threads about TMC , wich is exactly the role of the compensation capacitors arrangement C3/C2 and R33.

edit : If R33 is connected either to ground or + supply rail the compensation scheme
would be switched from TMC to TPC.

Last edited by wahab; 23rd November 2012 at 02:47 AM.
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Old 23rd November 2012, 08:52 AM   #209
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Quote:
Originally Posted by wahab View Post
It is on post 194 but neverless here it is again.
Sorry for not being clear.
I meant: Alex wrote on the PCB the words SCHEMATIC WAHAB. I am asking if this schematic comes from you or from Gabor.
Thank you!
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Old 23rd November 2012, 09:06 AM   #210
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Quote:
Originally Posted by wahab View Post
.............. If R33 is connected either to ground or + supply rail the compensation scheme would be switched from TMC to TPC.....
Yes that was what I was getting to.
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