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Old 6th August 2011, 12:23 PM   #361
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Default r 21?

i have made mistake when i post the old schematic and here is the corrected schematic. r21 is connected to power gnd same as apex schematic.input gnd can be connected to power gnd.but in apex schematic he used r36 as an option if hum is present.i have connected pin 3 of ic1 to input gnd same also in apex schematic.

foil pattern had been corrected in last post.
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File Type: jpg APEX SR50 Sch.jpg (454.3 KB, 1958 views)
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File Type: pdf studio reference schematic.pdf (40.6 KB, 353 views)
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Old 29th August 2011, 01:06 AM   #362
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i finish build this amp. Result is sound very excellent. Low noise. Vocal is clear and i like this amp. i use 2 pair power output. Drive on +-50V. Not use any buffer or pre amp. Use car heatsink. Thanks to apex and alex. More picture for my sr200 here.
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Old 29th August 2011, 02:16 AM   #363
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Quote:
Originally Posted by sasek View Post
Click the image to open in full size.
Nice PCB



Edit:

Q11 (BD139, bias regulator), Q13 (2SC4793) and Q12 (2SA1837) should be located at the same heatsink with 2SA1943/2SC5200
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Old 29th August 2011, 09:59 PM   #364
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right overpower.but that for testing only. i want to make other casing for this amp.
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Old 9th September 2011, 09:08 PM   #365
44250 is online now 44250  Serbia
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Just great amplifier,judging by the posts of the people that built it! That will be the third one from you APEX. The first one will be the AX12(or a B80),the second NX16 and the third studio reference 200. Now i know what i will build in a next year,two or even more-depends of my money/time sources. It is nice to have such a great people that are willing to share schematics and pcb-s of devices that are tested and risk-to-built-free! Greetings to all of you!
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Old 27th September 2011, 11:05 AM   #366
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if my sr200 have some noise.what the mainly my mistake?how to overcome noise?
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Old 27th September 2011, 05:19 PM   #367
44250 is online now 44250  Serbia
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What kind of noise? Deep bass or a sound of a wind through the trees? They are caused by a different things. First one could be from magnetic field of a transformer (if it is too close to an amplifier pcb-s),not enough filtering in a PSU(too small or old capacitors),damaged bridge rectifier...those are all reasons for a deep bass noise. I once had a noise ("wind in a tree"kind) in one other amplifier and it was caused by leaking capacitor 68nF,when I replaced it the noise was gone.
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Old 27th September 2011, 06:39 PM   #368
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noise like "tettttttttttttttt" not loud but exist.
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Old 16th October 2011, 03:44 PM   #369
bedjons is offline bedjons  Indonesia
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Ultimate Fidelity use current source and current mirror at differential stage, but I can't see inte Studio Reference. Why? Best regards
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Old 3rd November 2011, 09:12 AM   #370
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Quote:
Originally Posted by sasek View Post
if my sr200 have some noise.what the mainly my mistake?how to overcome noise?
Can you post pictures with ground wireing?
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