Studio Reference Amplifier

[apexaudio]

Originally Posted by Arif Budiyanto

Ok thanks,
which one is better, sanken or toshiba...? I bought toshiba transistors already ...my mistake...

Toshiba is OK

[apexaudio]

Originally Posted by AN214Q

Hi Apex,

Im new here, almost read this thread from the beggining. It is so exiting to hear this stuff with my own work in the future.

I have here home made transfomer 800va but secondary output is quitly different 60 0 57 vac. After rectify by bridge diode it become +83.2 and -81.5 vdc.

Can this affect to supply class a/b amplifier? or is their other way to fix output dc to get balance?

DIY expert are welcome to reply.

an214q

Use regulated PSU from post #11 and set +/-75 vdc for SR200

[Tony]

Originally Posted by AN214Q

Hi Apex,

Im new here, almost read this thread from the beggining. It is so exiting to hear this stuff with my own work in the future.

I have here home made transfomer 800va but secondary output is quitly different 60 0 57 vac. After rectify by bridge diode it become +83.2 and -81.5 vdc.

Can this affect to supply class a/b amplifier? or is their other way to fix output dc to get balance?

DIY expert are welcome to reply.

an214q

no other way but to rewind you secondaries, this time do a bifilar wind, 2 copper wires wound at the same time, this is how i do all my traffos.....

if you do as i say you will never have to worry about balance voltages ever again...

[apexaudio]

Originally Posted by Tony

no other way but to rewind you secondaries, this time do a bifilar wind, 2 copper wires wound at the same time, this is how i do all my traffos.....

if you do as i say you will never have to worry about balance voltages ever again...

No need to rewind secondaries, amp will work with this unbalanced rail voltages.

[AN214Q]

thank you Tony nice idea.

[JOHN BALI]

Originally Posted by apexaudio

MJE on center also need same heatsink as the others, and this SanKen can be use instead Toshiba on same pcb.
Regards

Thanks,
I move it a little & ...
I believe this is not final layout, because it can be modified again latter to be better

Originally Posted by apexaudio

No need to rewind secondaries, amp will work with this unbalanced rail voltages.

Will 300VA's trafo work for mono?
I'm planning to make my own trafo, maybe bifilar winding
Is this right :
55 Vac CT will work for non regulated PSU?
& 60 Vac CT will be OK for regulated PSU?

It will be my long... project

Regards

[apexaudio]

Originally Posted by JOHN BALI

Thanks,
I move it a little & ...
I believe this is not final layout, because it can be modified again latter to be better


Will 300VA's trafo work for mono?
I'm planning to make my own trafo, maybe bifilar winding
Is this right :
55 Vac CT will work for non regulated PSU?
& 60 Vac CT will be OK for regulated PSU?

It will be my long... project

Regards

Use maximum 50 Vac CT for non regulated PSU, 300VA will work for mono.
Regards

[P_0815]

Dear Apex,
i build your PSU for my amp. Therefor i changed the values of a few parts (see picture) for DC output voltage from 34V to 42V. The PSU regulate the voltage really well, but after a few minutes the transistors MSPA42 and MPSA92 will be hot. Where is the mistake?

Regards

[comasus]

will SR200 amplifier work @ 4ohms load with 4 pairs of o/p transistors with +/-68vdc?

and how much output power i'll get?

sound difference between ax-14 and sr200?

[apexaudio]

Originally Posted by comasus

will SR200 amplifier work @ 4ohms load with 4 pairs of o/p transistors with +/-68vdc?

and how much output power i'll get?

sound difference between ax-14 and sr200?

Yes and you will get 300W at 4ohms, I prefer sound of SR200.