All Hitachi Lateral Fet amplifier for DIY described by Paul Kemble - Page 20 - diyAudio
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Old 10th November 2012, 12:15 AM   #191
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Join Date: Sep 2005
Hello wahab

I made the mode on the layout but I'm not 100% sure if is correct.
Please forgive me I'm very tired, can you take a look please.
I use BC550/560 transistors, not face to face because that here isn't important.
I have another question
Can I use only 2PC capacitor in my amp power supply as efficient like 4PC CRC or CLC?
I have 4PC Kendeil capacitors 50V 50 000uF and I want to use them in a pair mono block (in my Darlington)
Now if two cap does not do as good job like CRC or CLC that case I have to purchase 4PC more. They are very expensive..
To use other type caps and degrade the quality of the Kendell that would be waste of money to.
I did built PS with two caps, it was not bad but I never compared with CRC or CLC type set up.
Actually the 2x50 000uF already over kill here.. I did purchased to use in my bridged ProFet clone, but that amp does not deserve to use those caps there because the Darlington sound that much better.

I see several good brand amp use only 2 large can cap in PS.
Greetings Gabor
Attached Images
File Type: bmp All fet Hitachi amplifier.bmp (90.3 KB, 66 views)
File Type: jpg bc550c.jpg (25.6 KB, 347 views)

Last edited by gaborbela; 10th November 2012 at 12:23 AM.
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Old 10th November 2012, 12:31 AM   #192
masood is online now masood  India
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dear sir,
plz also show me assembelled kit.
thanking you
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Old 10th November 2012, 03:10 PM   #193
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Quote:
Originally Posted by masood View Post
dear sir,
plz also show me assembelled kit.
thanking you
Hello
Of course!
As soon as I start populating the PC board I will post pictures!
Greetings Gabor
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Old 10th November 2012, 03:41 PM   #194
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Hello
Here is the layout I did include the last requested mode!
Yesterday I was very tired (not about the amplifier) the reason I do ask if the last mode is correct.
I'm sure it is correct.
Again if someone want to print out the layout please open it with the paint program, set up the printer (PAGE SETUP) 90% and that is the correct (right) size.
Any question you have about the layout I'll gladly answer it.
Thank again for the upgrade on the circuit!
Greetings Gabor
Attached Images
File Type: bmp All fet Hitachi amplifier.bmp (90.3 KB, 77 views)
File Type: bmp All fet Hitachi amplifier black.bmp (95.9 KB, 64 views)
File Type: gif HITACHI%20FFET%20MOD5%20SCH.gif (20.1 KB, 549 views)
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Old 11th November 2012, 07:32 PM   #195
tinitus is offline tinitus  Europe
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Gabor have asked to have a few posts moved to other thread
http://www.diyaudio.com/forums/solid...ears-go-5.html


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Old 11th November 2012, 07:35 PM   #196
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Thank you very much!
Greetings G
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Old 12th November 2012, 01:39 AM   #197
wahab is offline wahab  Algeria
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Location: algeria/france
Back to topic , some sims of the amp s expected caracteristics ,
with some comparisons with the much appreciated Goldmund Mimesis.
Attached Images
File Type: gif SMALL SIGNAL BW.gif (28.8 KB, 264 views)
File Type: gif LARGE SIGNAL BW.gif (25.3 KB, 243 views)
File Type: gif GOLDMUND VS GABOR AMP THD1.gif (42.7 KB, 239 views)
File Type: gif GOLDMUND VS GABOR AMP THD10.gif (42.4 KB, 75 views)
File Type: gif GOLDMUND VS GABOR AMP IMD 0.4 + 7KHZ.gif (44.1 KB, 78 views)
File Type: gif GOLDMUND VS GABOR AMP IMD 19 + 20KHZ.gif (35.9 KB, 76 views)
File Type: gif GOLDMUND VS GABOR AMP SSB.gif (28.5 KB, 71 views)
File Type: gif GOLDMUND VS GABOR AMP CMRR.gif (30.6 KB, 68 views)
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Old 12th November 2012, 06:19 AM   #198
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Hello
Very-very nice
Thank you wahab!
I hope there will be more interest to build these amp.
Greetings Gabor
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Old 12th November 2012, 12:29 PM   #199
wahab is offline wahab  Algeria
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Location: algeria/france
Hi Gabor,

Hope it will live up to expectations , that s somewhat of an extreme amp ,
the cascoded input stage + current mirrored cascoded differential VAS
structure has not been often used despite promising perfs.

Also , looking at a picture of your laterals , we can see that you have marked
them 0.88 or 0.89 , is it the gate/source voltage for 100mA current.?.
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Old 12th November 2012, 04:59 PM   #200
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Hello
I just simple match those after N Pass instruction. All do his matching is for vertical.
I match those under 16VDC and 30sec.
All started to warm up a bit until the end of 30sec (no heatsink used because take to long time the mouthing)
Greetings Gabor
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