All Hitachi Lateral Fet amplifier for DIY described by Paul Kemble - Page 27 - diyAudio
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Old 27th November 2012, 03:05 PM   #261
alex mm is offline alex mm  Europe
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Default PCB rev 4.3

...... and PCB rev 4.3 comments ,to make it .......
Regards Alex.
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Old 27th November 2012, 06:44 PM   #262
tinitus is offline tinitus  Europe
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looks even cleaner now

but your ground lines....
actually, I think ground lines should be even bigger sized than the supply rails

looks like theres plenty of empty board space for it now

turn the supply caps , and let the ground line go all the way up to output line
you dont need that long thin ground line for output zobel either, just connect it to ground
make the ground one single line, and as big as possible

its not a digital curcuit, its a high current thingie
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Old 27th November 2012, 10:19 PM   #263
alex mm is offline alex mm  Europe
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Default PCB rev 4.4

..... something like this ?
Alex.
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Last edited by alex mm; 27th November 2012 at 10:22 PM.
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Old 27th November 2012, 10:57 PM   #264
wahab is offline wahab  Algeria
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The mosfets pins 2 and 3 are wrongly connected and should be inverted...
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Old 28th November 2012, 01:45 AM   #265
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Hello
Yes Alex that is much better.
Wahab is right about the mosfet pin. If you can take one more advise.
I would go outside with the PS voltage to the mosfets both side.
I scratched one side like that, that case we could get read of that two jumper..
You have room enough to do that that way. When you invert the mosfet pin 2 & 3 you will gain some room with that to..
Thank you Alex
Greetings Gabor
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Old 28th November 2012, 05:24 AM   #266
alex mm is offline alex mm  Europe
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Default PCB rev 4.5

...... corrected PCB rev 4.5 attached
Alex.
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Old 28th November 2012, 05:34 AM   #267
joshvi is offline joshvi  India
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Hi Alex,
Very nice design.
But I have one suggestion,some wiring points are very close -signal input,
front end power supply, main power ground etc.Kindly avoid that .if you change R33 to left 0f R23A,we will get better looks.

Best regards
joshvi

Last edited by joshvi; 28th November 2012 at 05:46 AM.
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Old 28th November 2012, 06:26 AM   #268
tinitus is offline tinitus  Europe
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missing connection between power ground and signal ground ?
and thus negative speaker connect missing ?
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Old 28th November 2012, 06:41 AM   #269
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Hello
Wahab C12-1uF what type of capacitor, I guess foil but I ask before I do the mode on my test board
Alex from the old layout you left out C13 that was added later by wahab, it is paralleled with D2 and is a 100nF
Thanks
Greetings Gabor
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Old 28th November 2012, 08:01 AM   #270
wahab is offline wahab  Algeria
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C12 is 1nf but its value is not critical at all , you can take anything up to 100nF
I took 1nF since this allow using cheap MKP caps as the voltage rating is 200V mini
for this cap.
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