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Old 23rd May 2011, 03:02 PM   #311
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Quote:
Originally Posted by viki_v2 View Post
Mile I had sent you an email, did you get it.
Yes, but I have no time to answer, it's long mail and my English is bad.
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Old 23rd May 2011, 03:06 PM   #312
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Quote:
Originally Posted by macd View Post
I used this PCB from Alex mm....

Regards,
MACD
C1 is 10uF/50V, and you use 1uF/250V, try to increase value of C1 (2,2uF 3,3uF 4,7uF 6,8uF... is available)
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Old 23rd May 2011, 03:20 PM   #313
alex mm is offline alex mm  Europe
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macd nice built amplifier , yes it's my mistake regarding size of output transistors . I hoppe now will be the correct one .It was designed for MJL 1302 and MJL 3281 with TO3P case (I have 20 pices ON SEMI)
Alex mm not Alexx mm !
L.E. Sorry , value for emiter resistor 0.33 ohm not 0.68 , please correct .
Attached Images
File Type: jpg SR200 V2.3.jpg (464.7 KB, 1648 views)
Attached Files
File Type: pdf SR 200 V2.3.pdf (41.8 KB, 776 views)

Last edited by alex mm; 23rd May 2011 at 03:23 PM.
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Old 24th May 2011, 05:57 AM   #314
macd is offline macd  South Africa
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Default RE Cap Value....

Quote:
Originally Posted by apexaudio View Post
C1 is 10uF/50V, and you use 1uF/250V, try to increase value of C1 (2,2uF 3,3uF 4,7uF 6,8uF... is available)
Regards
Hello Apex,

Yes I know, I tried to get 10uF/63V but supplier was out of stock. I will get the correct value and replace C1. I will even try to increase value as you suggested and will give feedback on my listening experience. I listen to your amp yesterday for about a hour, and I must confess, it is excellent. Almost complete with second channel. Will post some pics when completed.

Can I use this PSU with 65V supply? If yes, what changes do I need to make?

Regards
MACD
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File Type: jpg APEX F100PSU PCB.jpg (762.9 KB, 1516 views)
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Old 24th May 2011, 06:01 AM   #315
macd is offline macd  South Africa
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Default RE PCB...

Quote:
Originally Posted by alex mm View Post
macd nice built amplifier , yes it's my mistake regarding size of output transistors . I hoppe now will be the correct one .It was designed for MJL 1302 and MJL 3281 with TO3P case (I have 20 pices ON SEMI)
Alex mm not Alexx mm !
L.E. Sorry , value for emiter resistor 0.33 ohm not 0.68 , please correct .
Hello Alex mm,

Sorry for my wrong spelling. Thank you very much for this updated PCB. I tried to get MJL transistors but local supplies does not stock them. I will use this new version PCB in future builds.

Once again, thank you very much for your PCB layout.

Regards,
MACD
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Old 24th May 2011, 06:19 AM   #316
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Quote:
Originally Posted by macd View Post
Hello Apex,

Yes I know, I tried to get 10uF/63V but supplier was out of stock. I will get the correct value and replace C1. I will even try to increase value as you suggested and will give feedback on my listening experience. I listen to your amp yesterday for about a hour, and I must confess, it is excellent. Almost complete with second channel. Will post some pics when completed.

Can I use this PSU with 65V supply? If yes, what changes do I need to make?

Regards
MACD
You can use PSU from 'DC Servo Mosfet Amp' with 10000uF/80V and 1k5/5W instead 1k2/5W.
Do you compare sound of SR200 with other amps?
You can use SanKen 2SA1294/2SC3263 or you can find some other outputs in TOP3 or TO247 case.
Only with stereo amp you can feel complete sound quality of SR200.
Regards

Last edited by apexaudio; 24th May 2011 at 06:25 AM.
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Old 24th May 2011, 07:07 AM   #317
mathez is offline mathez  Indonesia
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mile.,
what changes do I need to make,SR200 with 4pair MJL 1302/3281?thanks
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Old 24th May 2011, 11:39 AM   #318
macd is offline macd  South Africa
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Default RE PSU....

Quote:
Originally Posted by apexaudio View Post
You can use PSU from 'DC Servo Mosfet Amp' with 10000uF/80V and 1k5/5W instead 1k2/5W.
Do you compare sound of SR200 with other amps?
You can use SanKen 2SA1294/2SC3263 or you can find some other outputs in TOP3 or TO247 case.
Only with stereo amp you can feel complete sound quality of SR200.
Regards
Hello Apex,

Yes, I have a commercial PIONEER amp, a DX ST and a DX supercharge, and also have a mosfet amp as well, but I like SR200 sound the most. Speakers are small bookshelf type. Will connect with proper speakers (15" inch) this weekend.

Can I use this PSU for SR200 amp. I know there is no PRO pin on SR200, but will soft start, switch on delay and DC cutout still work? If yes, what changes do I have to make to work of 65V?

Regards,
MACD
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File Type: jpg APEX HV350 PSU.jpg (432.6 KB, 1303 views)
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Old 24th May 2011, 11:41 AM   #319
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Quote:
Originally Posted by mathez View Post
mile.,
what changes do I need to make,SR200 with 4pair MJL 1302/3281?thanks
No changes,
Regards
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Old 24th May 2011, 11:50 AM   #320
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Quote:
Originally Posted by macd View Post
Hello Apex,

Yes, I have a commercial PIONEER amp, a DX ST and a DX supercharge, and also have a mosfet amp as well, but I like SR200 sound the most. Speakers are small bookshelf type. Will connect with proper speakers (15" inch) this weekend.

Can I use this PSU for SR200 amp. I know there is no PRO pin on SR200, but will soft start, switch on delay and DC cutout still work? If yes, what changes do I have to make to work of 65V?

Regards,
MACD
You can use this PSU without changes, protect circuit use separate 20V AC suply, and amp PSU voltage can be change to +/-65V. I suggest to add overload protect circuit from HV350, and you have 'pro' from SR200.
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