Studio Reference Amplifier

[apexaudio]

Originally Posted by vdi_nenna

Unbalanced Studio Reference? Someone should say it.

Balanced input circuit is on separate PCB.

[Mamak]

apex..for psu regulator.If i supply 24 0 24 ac,it work or not?

[apexaudio]

Originally Posted by Mamak

apex..for psu regulator.If i supply 24 0 24 ac,it work or not?

PSU regulator will work, just use 6,8V zeners instead 12V, and you can set output voltage about +/-30V DC.

[Mamak]

thanks.Can you design pcb for high quality amplifier for room like hifi sound using two 2sc5200 and two 2sa1943?I never seen your design using two 2sc5200.

[apexaudio]

Originally Posted by Mamak

thanks.Can you design pcb for high quality amplifier for room like hifi sound using two 2sc5200 and two 2sa1943?I never seen your design using two 2sc5200.

You can use Coolets pcb design for SR50 and add another pair of outputs,
Regards

[apexaudio]

Beter is to use SR100 (cascode VAS) and add anothe pair of outputs

[noobie]

Originally Posted by apexaudio

PCB in progres...

apex, when will you release or show the pcb pattern for sr400?
or are you going to share it?
thanks

regards

[apexaudio]

Originally Posted by noobie

apex, when will you release or show the pcb pattern for sr400?
or are you going to share it?
thanks

regards

I will share only DIY pcb version for this amps.
APEX Studio Reference SR400 is very expensive amplifier , and I share only simple schematic for DIY.
Regards

[alex mm]

I have not pcb layout for this shunt regulated PSU for preamps, if someone have time for pcb design..

......now you have PCB for PSU but must be check if it's correct
Regards Alex.

[apexaudio]

Originally Posted by alex mm

......now you have PCB for PSU but must be check if it's correct
Regards Alex.

Thank You for this design, it's be very usefull for many diyers includeing me.
Do You use heatsinks to connect colectors of BC639/640, BD241/242 to GND?
Regards