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Old 28th October 2010, 05:29 PM   #101
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Originally Posted by vdi_nenna View Post
Unbalanced Studio Reference? Someone should say it.
Balanced input circuit is on separate PCB.
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Old 9th November 2010, 09:43 AM   #102
Mamak is offline Mamak  Malaysia
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apex..for psu regulator.If i supply 24 0 24 ac,it work or not?
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Old 9th November 2010, 11:18 AM   #103
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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.
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Old 9th November 2010, 06:55 PM   #104
Mamak is offline Mamak  Malaysia
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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.
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Old 9th November 2010, 09:05 PM   #105
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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
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Old 10th November 2010, 01:51 PM   #106
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Beter is to use SR100 (cascode VAS) and add anothe pair of outputs
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Old 13th November 2010, 05:35 AM   #107
noobie is offline noobie  Philippines
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Default waiting for the pcb pattern

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Originally Posted by apexaudio View Post
PCB in progres...
apex, when will you release or show the pcb pattern for sr400?
or are you going to share it?
thanks

regards
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Old 13th November 2010, 11:07 AM   #108
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Originally Posted by noobie View Post
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
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Old 13th November 2010, 07:28 PM   #109
alex mm is offline alex mm  Europe
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Default PCB for PSU +/-24 v

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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.
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File Type: jpg APEX PSU 24V.JPG (833.7 KB, 2792 views)
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Old 14th November 2010, 09:28 AM   #110
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......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

Last edited by apexaudio; 14th November 2010 at 09:30 AM.
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