Studio Reference Amplifier

[apexaudio]

APEX SR100 Studio Ref Amp

 

[wahab]

Interessant schematic, Apex...
Shouldn t Q6 base rather go to Q3 collector
and Q5 base to Q4 collector ?...

 

[apexaudio]

:

Interessant schematic, Apex...
Shouldn t Q6 base rather go to Q3 collector
and Q5 base to Q4 collector ?...

Wahab, you are faster than usual, thank you🙂
Regards

 

[apexaudio]

I use PCB from old DC Servo Mosfet Amp for test this circuit, after basic tests amp work on my desk without case on +/-45V DC rail voltage. Sound is without any compromise, and musicans like it.

 

[apexaudio]

Circuit can work with IRFP240/IRFP9240 (R30-10k, without C10,C11-100pF). Zobel network with 10R, 22nF and 4R7,10uH is on PSU pcb. MJE340/MJE350 must have heatsink (10mA), amp can work with +/-90V DC rail voltage with more outputs (R20,R21,R22,R23-100k instead 47k, R24-12k/1W instead 6k8).

 

[apexaudio]

Wiyh this PSU amp rail voltage can be set and will be stabilized. 2SA1943/2SC5200 must have heatsink.

 

[apexaudio]

This is my amp from 80', modular drivers and protect pcb only caps is too big to be fit on amplifier motherboard. I considering to use this design for 'Studio Reference Amp'.

 

[coolet]

Wiyh this PSU amp rail voltage can be set and will be stabilized. 2SA1943/2SC5200 must have heatsink.

nice PSU very simple. how much ampere it can handle?

 

[apexaudio]

nice PSU very simple. how much ampere it can handle?

Single pair in PSU can suply two pairs in amp output, it's simple.
Regards

 

[apexaudio]

Output voltage with this PSU can be set from 35V to 65V 5A with single pair 2SA1943/2SC5200.

 

[apexaudio]

Regulated PSU can be use for test DIY amps with different rail voltage, and give extra quality to any amp.

 

[apexaudio]

Schematic with corrected caps voltage (100V instead 63V)

 

[apexaudio]

PSU-5 PCB size: 135x87mm

 

[apexaudio]

Regulated PSU for Amps with 4 pairs of outputs, output voltage can be set from +/-55V to +/-90V.

 

[Samuel Jayaraj]

What is the minimum drop voltage for good regulation and manageable dissipation? Thanks for sharing.

 

[electra_ina]

Hii..Apex..for PSU regulated..can I used TIP 31c/32c instead for BD241c/242c ?
Thanks

 

[apexaudio]

Hii..Apex..for PSU regulated..can I used TIP 31c/32c instead for BD241c/242c ?
Thanks

This is the same transistors, you can use it.
Regards

 

[apexaudio]

What is the minimum drop voltage for good regulation and manageable dissipation? Thanks for sharing.

I suggest to set output voltage to get 10-15V lower than input unregulated voltage. Larger difference give better voltage stability but with more dissipation.
Regards

 

[electra_ina]

This is the same transistors, you can use it.
Regards

Thanks alot....😉
Pozdrav

 

[Tekko]

Mr. Apex, is it me or do all of your amp schematics look the same ?