All Hitachi Lateral Fet amplifier for DIY described by Paul Kemble - Page 32 - diyAudio
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Old 9th December 2012, 05:59 AM   #311
wahab is offline wahab  Algeria
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A few more simulations , particularly interesting for whom is concerned
by TIM/DIM/SID/TID , that is , that s all the names given to some
kind of Loch Ness monster that is periodicaly agitating the audio
people cercles still unabated after 40 years or so of a deafs debate...

The (radical) test signal is 99KHZ + 100KHZ sines with 1/1 ratio ,
at about 64W RMS/8R for slew induced distorsion evaluation as well
as a THD sim with a single 100KHZ signal at the same power to check
if low HD does correlate with low IMD.

The 99+100KHZ fourier analysis graph is presented in three plots ,
a global linear view , a log scale to highlight the low frequency products
and a restriction to show the high frequency products adjacent to the test
signal frequencies.

It looks like that even at such high frequencies this amp still manage
to work in HiFi territory..
Attached Images
File Type: gif HITACHI FFET MOD5.5 THD100.gif (40.1 KB, 341 views)
File Type: gif HITACHI FFET MOD5.5 IMD99100A.gif (28.0 KB, 326 views)
File Type: gif HITACHI FFET MOD5.5 IMD99100B.gif (29.9 KB, 294 views)
File Type: gif HITACHI FFET MOD5.5 IMD99100C.gif (30.0 KB, 281 views)
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Old 9th December 2012, 11:12 AM   #312
AndrewT is offline AndrewT  Scotland
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Please confirm I am reading the vertical scales correctly.
In pic 1, the 2nd and 3rd harmonics are about -70dB ref the test tone.
in pic 3, the 1kHz is ~-100dB and the 2kHz is ~-115db ref the test tone

When two tones exist, as in th IMD plots, should we sum the tones for test tone reference voltage?
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regards Andrew T.
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Old 9th December 2012, 02:45 PM   #313
wahab is offline wahab  Algeria
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You are correct Andrewt,

The test signals individual amplitude is half of the total amplitude
wich is 32V peak that s why they both appear at 16V peak , i should
have added the output signal graph , see below.
Attached Images
File Type: gif HITACHI FFET MOD5.5 IMD99100D.gif (17.9 KB, 256 views)
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Old 9th December 2012, 04:09 PM   #314
wahab is offline wahab  Algeria
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The step response as a complement.

Since the max slew rate is 50V/us it is just obvious that very high
slew rates are not necessary for high perfs in respect of IMD since
any additionnal speed will be perfectly useless as a circuit linearity
becomes the limiting factor once the slew rate is enough for the
projected bandwith reproduction.
Attached Images
File Type: gif HITACHI FFET MOD5.5 SLEW RATE.gif (22.1 KB, 39 views)
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Old 9th December 2012, 07:39 PM   #315
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I have the PC boards, picture comes soon.
Greetings
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Old 10th December 2012, 03:17 AM   #316
wahab is offline wahab  Algeria
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Quote:
Originally Posted by ashok View Post
I had a whole bunch of Hitachi application notes on audio amps using their LatFET's. I'll search them out and put up a copy on the forum. I got them around 1981.

There s tons of derivatives of all kind but the general trend
seems to be picking up the basic app notes at face value,
so it would be interesting to see some of their ideas , for the record..
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Old 10th December 2012, 05:26 AM   #317
Junie is offline Junie  Philippines
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Quote:
Originally Posted by loek View Post
Check connections of C12 please

Hi Loek,

Please check if it's ok now , I only use PAINT to modify it. Thanks.

Click the image to open in full size.

Best regards,
Junie
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Old 10th December 2012, 04:52 PM   #318
wahab is offline wahab  Algeria
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That seems correct , there just the track between the two transistors pins
that is too thin , it can be enlarged if one component is slightly displaced.

Anyway , thank for the efforts.
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File Type: png juni rev.png (94.6 KB, 63 views)
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Old 10th December 2012, 08:12 PM   #319
alex mm is offline alex mm  Europe
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......
Attached Images
File Type: jpg PCB WAHAB ALL COLOR.jpg (1.06 MB, 155 views)
Attached Files
File Type: pdf PCB ALL GREY.pdf (216.2 KB, 84 views)
File Type: pdf PCB B&W TOP VIEW BOTTOM SIDE.pdf (178.2 KB, 87 views)
File Type: pdf PCB TOP SILK SCREEN MIRRORED.pdf (317.5 KB, 77 views)
File Type: zip gerber files.zip (120.0 KB, 64 views)

Last edited by alex mm; 10th December 2012 at 08:21 PM.
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Old 11th December 2012, 12:53 AM   #320
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Thank you very much Alex!!!
If these would came a bit earlier I would used your layout.
Now I made the PC boards, I do not want to make new boards, from that etching solution has lot of headache.
I hope it will be enough interest to run a GB.

Greetings Gabor
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