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apexaudio 12th September 2010 05:40 PM

Studio Reference Amplifier
 
2 Attachment(s)
APEX SR100 Studio Ref Amp

wahab 12th September 2010 05:49 PM

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

apexaudio 12th September 2010 05:54 PM

:
Quote:

Originally Posted by wahab (Post 2300789)
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 12th September 2010 11:04 PM

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 13th September 2010 11:23 AM

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 14th September 2010 10:24 PM

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

apexaudio 16th September 2010 09:06 AM

1 Attachment(s)
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 16th September 2010 11:08 AM

Quote:

Originally Posted by apexaudio (Post 2303230)
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 16th September 2010 11:16 AM

Quote:

Originally Posted by coolet (Post 2304866)
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 16th September 2010 12:17 PM

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


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