Studio Reference Amplifier

[apexaudio]

Apex, what is the maximum voltage can be used for this SR200?

I suggest +/-75V DC rail voltage for SR200.

 

[wattaniya]

which version is correct v2 or v2.2?

 

[apexaudio]

which version is correct v2 or v2.2?

Both versions are correct.

 

[wattaniya]

why is two out in this pcb and there is two resistor in one place?

 

[apexaudio]

why is two out in this pcb and there is two resistor in one place?

Out without inductor is for use with speaker terminal, resistor 0,25W or 1W is only for test, gnd for amp input connect to PSU gnd with separate wire.

 

[blueice23]

Hello Alex MM,


I'm wondering if you can post the following PCB foil pattern in mirrored or flip as I'm going to use it for Laser toner transfer method. If possible in PDF format and actual print size please.

Thank you so much!

Cheers,
Blueice23

 

[apexaudio]

SR200

 

[wattaniya]

SR200

which output transistor u use .
why is two transistor opposite side.?
here 1837,4793 transistors are sri lankan ruppees (25rs) thats mean (.20 us dollars) what purpose u put subs.
if u fix like this in opposite its not a professional look and wasting time.

 

[apexaudio]

This SR200 on the pictures is not my work, drivers transistors in TO126 case have oposite pins compare to TO220.

 

[wattaniya]

This SR200 on the pictures is not my work, drivers transistors in TO126 case have oposite pins compare to TO220.

sorry for the misunderstand.

 

[apexaudio]

sorry for the misunderstand.

If drivers are 2SA1837 and 2SC4793 use normal position (back to heatsink)

 

[apexaudio]

This amp made by diyaudio member with recicled parts on SR200 pcb design by 'alex mm', and I want his coment about sound here.

 

[apexaudio]

Alex use two 470k resistor in series insted 1M in DC servo circuit, both is OK.

 

[apexaudio]

Phono Preamp

MM Phono preamp

 

[apexaudio]

PSU for preamps. I suggest this +/-15V regulated psu instead 7815/7915, 317/337. This serial regulator can give more current than shunt regulated psu (1A max).

 

[apexaudio]

Phono, Line preamps and PSU can be on same pcb like in my Hi-Fi preamp from '80.

 

[apexaudio]

This buffer can be use instead preamp.

 

[blueice23]

Transistors

Hello Mr. Mile Sir,

I'm planning the to make the SR 200 ref amp. Can I add seven more transistors per rail? What would be the maximum power output and maximum possible supply voltage?

Thanks,
Blueice23

 

[apexaudio]

Hello Mr. Mile Sir,

I'm planning the to make the SR 200 ref amp. Can I add seven more transistors per rail? What would be the maximum power output and maximum possible supply voltage?

Thanks,
Blueice23

For more outputs you must use triple darlington topology. Maximum power can be 750W/4R, and +/-110V rail voltage.

 

[blueice23]

For more outputs you must use triple darlington topology. Maximum power can be 750W/4R, and +/-110V rail voltage.

Hi Mr. Mile Sir,


With +/-110V rail voltage, Can I bridge the SR200 circuit to have 1500W/8R? If so, what are the parts I may need to change?


Thanks,
Blueice23