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-   -   Studio Reference Amplifier (http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier.html)

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 (http://www.diyaudio.com/forums/showthread.php?p=2300789#post2300789)
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 (http://www.diyaudio.com/forums/showthread.php?p=2303230#post2303230)
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 (http://www.diyaudio.com/forums/showthread.php?p=2304866#post2304866)
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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