Studio Reference Amplifier

[apexaudio]

Originally Posted by 44250

That i going to be APEX SR200,one fine day,this year!

I suggest new pcb design for TO3 outputs like MJ15024/MJ15025, and use this L heatsink.

[44250]

Nice spec.´s for MJ pair,but the price is more than double than 2SC5200/2SC1943. Would there be trouble if i use 2SC/2SA pairs on 4 Ohm load? If i calculated it well,there would not be trouble but i am not so sure in my calculations. I am messing RMS and Peak voltages with current through the output transistors and speaker. If i calculated well,for 200W on 8ohm there should be 40Vrms/56,4Vp and the current should be 5A. For the same output voltage on 4Ohm load there would be 10A of current. On output transistors there would be 35V if i use 40Vrms or 350W of disipation for three of them (116W/transistor). If i use Vp value (56,4Vp) there would be 18,6V /10A or 186W for all of them(62W/transistor)

Is there any good from my calculations,and if there is,what value of voltage should i use;Vrms or Vp?

(sorry for beginers questions,just don´t know how to find out...)

[kamranyousaf]

[QUOTE=viki_v2;2543437]

Originally Posted by viki_v2

Hello,
OK, I have not paralleled the resistor to inductor, Will do it.

Alex I mounted the transistors, and connected to psu.
Fired up and connected to mobile phone---- No sound.
Mobile disconnected Touch input pin with hand it make lots of noise and 22e resistor on psu gets extremely hot.
Checked all the connections.
Checked for shorts- No shorts.
Checked transistors for short to heat Sink- No short.
Disconnected speaker gnd from psu gnd- Psu resistor does not get hot, Connect again gets hot.

what Could be the problem.

And how do I Measure and adjust the Bias, Please Show exact procedure, I have never done it before.

Sir,

Plz share its schematic

[apexaudio]

PSU-10 from Indonesian forum

[apexaudio]

SR200 from Indonesian forum

[Arif Budiyanto]

Dear Mr. Apex,
I am sorry .
I plan to post it here after I write some review about it, with some measurements I conducted. I have just finished and test it for some hours. The wiring is so mess...
I will post it soon..
Thank you so much for sharing your amplifier designs...
Best regards,
Arif Budiyanto

[apexaudio]

Originally Posted by Arif Budiyanto

Dear Mr. Apex,
I am sorry .
I plan to post it here after I write some review about it, with some measurements I conducted. I have just finished and test it for some hours. The wiring is so mess...
I will post it soon..
Thank you so much for sharing your amplifier designs...
Best regards,
Arif Budiyanto

Nice work, can you share your PSU-10 pcb design?
Regards

[Arif Budiyanto]

The Toshiba 5200 pairs are located below the pcb. Two caps 10000uf/50v are supposed to be 10000uf/63v

[Arif Budiyanto]

What is the maximum supply for this SR200, I have some 10.000uf/80v caps?
Thank you
Best regards,
Arif

[apexaudio]

Originally Posted by Arif Budiyanto

What is the maximum supply for this SR200, I have some 10.000uf/80v caps?
Thank you
Best regards,
Arif

Maximum supply for SR200 is +/-75V
Regards