All Hitachi Lateral Fet amplifier for DIY described by Paul Kemble - Page 22 - diyAudio
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Old 23rd November 2012, 08:52 PM   #211
alex mm is offline alex mm  Romania
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Default PCB rev 2.0

...... thanks for comments , here it's rev 2.0 better then first ?
Regards Alex.
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Old 23rd November 2012, 08:59 PM   #212
tinitus is offline tinitus  Europe
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Im sure its electrically perfect, but I still cant help thinking how it would look if the lower fets were 'folded' up in line with their mates

hey, btw, I suppose it would be possible to just omit mounting one output pair if you only want it with two output pair, and maybe lower voltage a bit
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Old 23rd November 2012, 11:08 PM   #213
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Hello
Nice design Alex as always, thank you.
Tinitus you right, at these aranjament you need to use some copper heat spreader under the mosfets that would help a lot.
Since all 6 mosfet biased min. 100mA/each and they are close to each other that would be the best solution.
I think we could use these PC board.

Greetings Gabor
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Old 24th November 2012, 05:02 PM   #214
alex mm is offline alex mm  Romania
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Default PCB Rev3.0

...... I'm agree could be layout better , have finished rev 3.0
Alex.
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Old 24th November 2012, 05:45 PM   #215
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@alex mm, which is the distance between the edge of the pads 2SK1058 / 2SJ162 power transistors ? I think that distance is too small. It's a mistake that is seen in many PCB's that you created. And not only there.
And GND route drawn circular is not a good choice.

By the way, who is the last diagram the amplifier ? I ask this because at one point I gave up watching this topic, which initially wanted something and got something else.
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Old 24th November 2012, 06:23 PM   #216
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Hello donpedru
All the design work was done by wahab. By the way welcome back.
I know it became another amp how we planed but if you take a look at the sim result it isn't just another amp.
I'd rather gave up my idea to get a nice & a great sounding amplifier!
I'm very happy how it came out! Soon I will fabricate the PC boards and stat testing her.
Alex really nice work! I like it a loot, I didn't took the time to go over but at the first sight very nice!
Alex please do not forget P Danie PC boards design. I had the A30 , those mosfet were very close, biased in full Class A and still worked properly. I used a heat spreader because my heatsink was not one full piece.
I think and believe these will work. We can rotate these PC board if there is a need!!!

Greetings Gabor
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Old 24th November 2012, 06:41 PM   #217
tinitus is offline tinitus  Europe
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looks good, but still ineffective heatspread
heat goes upwards on heatsink
and lower outputs will put heat strain on the upper outputs
please please, put all outputs in one straight line
imagine a 300mm heatsink
board length of 150-200mm seems ideal

well, maybe only in theory
and in reality, after a while they all just get bloddy hot
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Old 24th November 2012, 06:48 PM   #218
alex mm is offline alex mm  Romania
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@donpetru distance it's 1 inch ,or 25.4 mm from center to center OT.....
I layout, in few hours, and have joint ground plains , left side with right side yes I admit my mistake , corrected .
Regards Alex.
L.E. I will try tomorow to layout all in line , but for today it's enough .
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Last edited by alex mm; 24th November 2012 at 06:53 PM.
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Old 24th November 2012, 07:28 PM   #219
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by alex mm View Post
L.E. I will try tomorow to layout all in line , but for today it's enough .
you get 3 smileys for that
try look at placing power rails and ground from the board middle(connectors at front edge)
and perfectly ok to use a wire jumper, when it makes sense to do that
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Old 24th November 2012, 08:34 PM   #220
Bensen is online now Bensen  Belgium
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Just an idea for Alex his PCB layout. I used the same position for the OPS in my last amp.

I use 1.5mm² copper wire on the outside of PCB's to solder the output devices on to, when the PCB and OP devices are first mounted to the heatsink. Makes life a lot easier when disassembling the board to make an update or whatever you want to do.
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