All Hitachi Lateral Fet amplifier for DIY described by Paul Kemble - Page 28 - diyAudio
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Old 28th November 2012, 02:27 PM   #271
alex mm is offline alex mm  Europe
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...... just in time received correct information to prepare final form of this PCB If I have forget something please tell me what to do ......or not ,to do.
Alex.
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Old 28th November 2012, 02:46 PM   #272
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by alex mm View Post
If I have forget something please tell...
yes, noone responded, but I still think you should connect speaker ground right next to board ground spade
as should ground from frontend aux supply, and signal ground
btw, speaker negative is signal ground just as well as your source
plenty of space for another connect spade(or two) beside the supply ground spade connect
then you can connected all grounds there
it is the right place for it ...especially if main supply caps are further away
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Old 28th November 2012, 02:54 PM   #273
alex mm is offline alex mm  Europe
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Quote:
Originally Posted by tinitus View Post
yes, I think speaker ng/ground should connect right next to board ground spade, and signal ground
plenty of space for another spade connector beside the supply ground
it is the right place for it
No I don't think so , spk negativ must go to star ground , INHO .....
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Old 28th November 2012, 02:58 PM   #274
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thats what it is, star ground
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Old 28th November 2012, 03:08 PM   #275
wahab is online now wahab  Algeria
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Quote:
Originally Posted by alex mm View Post
No I don't think so , spk negativ must go to star ground , INHO .....
That s the best solution i think.

Also , there s a 1R (R34) resistor that is missing in the PCB between the signal
and power ground.
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Old 28th November 2012, 03:19 PM   #276
tinitus is offline tinitus  Europe
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where do you connect ground from front end aux supply ?

Quote:
Originally Posted by wahab View Post
there s a 1R (R34) resistor that is missing in the PCB between the signal
and power ground.
ah !
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Old 28th November 2012, 03:28 PM   #277
wahab is online now wahab  Algeria
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Quote:
Originally Posted by tinitus View Post
where do you connect ground from front end aux supply ?



ah !
Neverless , there s two wires from the PCB that goes to the ground star point ,
one originating from PCB power ground and the other from PCB signal ground.

This resistor is just here for redundancy.
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Old 28th November 2012, 05:12 PM   #278
AndrewT is offline AndrewT  Scotland
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Leach refers to it as the HF connection with reduced impedance due to low inductance of the very short on the PCB routing.

The long routing, if the Main Audio Ground is off the PCB, will inherently have high inductance and thus high impedance to HF.
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Old 28th November 2012, 05:34 PM   #279
AKN is online now AKN  Sweden
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Hi,

What do you think of running the thick power ground trace above the drivers?
This would greatly decrease magnetic fields close to small signal circuitry. Further, decoupling caps could even be grouped together in top middle - real small high current loop.
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Old 28th November 2012, 07:22 PM   #280
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Hello
Here is my test board so called "art work"
I upgrade it up to the last mod, I ad the Q20 and the two C12/13 caps.
Since all hand drawn on my computer paint program I do not have silkscreen like Alex who is great and talented with software design.
I did tried one time to use some free software, I didn't succeed so I keep draw my layout by hand.
These is hot iron transfer friendly at least...
Alex design is so beautiful I would pay to get it on a professional made PC board.
In case someone want to go ahead use these as a test boards please open with the paint program, after page set up, chose 90% and print.
If you need the color code I use from the components I already posted but I will help with.
Greetings Gabor
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