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Old 27th August 2005, 08:31 AM   #11
mos is offline mos  Romania
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Hy roly3055! Can you send me the PCB and the schematic for this amp.
My mail is beatDj05@yahoo.com
Thanks a lot.
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Old 29th September 2005, 03:06 PM   #12
r!sc! is offline r!sc!  Serbia
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P3A PCB... Another attempt... Opinion?

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Old 29th September 2005, 04:16 PM   #13
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That's an enormous input capacitor

Douglas Self claims that it is important that the negative feedback takeoff point is taken exactly between the power-resistors a small bit in on the output track, and not a little bit closer one of the resistors so it gets the exakt output voltage.

else it looks nice
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Old 29th September 2005, 05:35 PM   #14
r!sc! is offline r!sc!  Serbia
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Hi,

it's a standard footprint for MKP 4.7uF cap, like Wima MKP10, Visaton MKP, Solen 4,7uF...

Thanks for replay, i will try to modifiy layout.
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Old 29th September 2005, 10:05 PM   #15
r!sc! is offline r!sc!  Serbia
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Fritzell, did U think something like this:

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Old 30th September 2005, 12:34 AM   #16
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Hi r!sc!,
What type of output transistors you use on your pcb? Pinout is strange or I’m missing something?
Pozdrav sa juga!
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Old 30th September 2005, 12:51 AM   #17
r!sc! is offline r!sc!  Serbia
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Quote:
Originally posted by chicco_36
Hi r!sc!,
What type of output transistors you use on your pcb? Pinout is strange or I’m missing something?
Pozdrav sa juga!
Hi there,

I use ON MJL21193/94 trans. Drivers are ON MJE15032/33.

Kako je u makedoniji? Pozdrav!
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Old 30th September 2005, 02:29 AM   #18
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Hi r!sc!,

If I remember correctly of MJL output transistors pinout, and since your picture is mirrored, you have “nice and healthy” +-35V on your bases! Did you actually build this amp?
I hope I’m wrong!

Srdacan pozdrav!
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Old 30th September 2005, 02:44 AM   #19
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Quote:
Originally posted by chicco_36
If I remember correctly of MJL output transistors pinout, and since your picture is mirrored, you have nice and healthy +-35V on your bases! Did you actually build this amp?
I hope I'm wrong!
I see nothing wrong with the layout. r!sk!'s artwork shows the traces on the bottom of the PCB as seen from the component side, as if the PCB material were invisible. Printing this as is works well when using the toner transfer method to etch PCBs.
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Old 30th September 2005, 02:45 AM   #20
Ipanema is offline Ipanema  Malaysia
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Hi Roly3055 ,

I just complete one channel of blameless amplifier. Would like to know how you mirror one channel to get two channel side by side on eagle?

r!sc!,

Your input and decoupling caps sharing the same ground, will it generate hum?

Thanks.
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