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14th September 2006, 04:02 PM
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#1 |
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diyAudio Member
Join Date: Sep 2005
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Aura Va100 Evoluton Ii
I bought it from my friend him told me that it's a best of integrated amplifier '96s.
I already received its PCB from R&D shop, they ask me for 100USD !!! Hope analog guy |
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14th September 2006, 04:19 PM
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#2 |
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diyAudio Member
Join Date: Sep 2005
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Schematic
Aura VA100 II schematic, not include protection circuit (Patent Pending)
Thank analog guy |
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14th September 2006, 04:33 PM
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#3 |
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diyAudio Member
Join Date: Sep 2005
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Prototype PCB
Prototype PCB, protel again !
Regard analog guy |
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14th September 2006, 04:45 PM
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#4 |
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diyAudio Member
Join Date: Sep 2005
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Top overlay + bottom layer
Next week I'll find its parts and test PCB again after I finished my MODIFIED GAMUT D50 CLASS-A, need good chassis !
regard analog guy |
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15th September 2006, 04:23 AM
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#7 |
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diyAudio Member
Join Date: Sep 2005
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Some links
http://amp8.com/tr-amp/foreign/aura/va100-2.htm
http://www.geocities.jp/tsoka/AURA-VA100.htm 4700uF/63V ?!? 50WRMS ? It's my inspiration, how about that ? Regard analog guy |
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15th September 2006, 08:20 PM
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#8 |
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diyAudio Member
Join Date: Sep 2005
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Constant gain & protection !
2*TL084 for constant gain amplifier and 1*LM339 for input : output gain comparator.
TL084 used for special calculate voltage gain (AV) of amplifier when used with vary impadance load output (hard to drive speaker) on the circuit you can see only RF/RI for calculate AV but this IC are special more than typical amplifier ! LM339 used for comparator INPUT : OUTPUT voltage when there're some problem with output such as shorted output relay was disconnect from LM339 function, Vo/VI not equal in same dB Example MAXIMUM OUTPUT : INPUT = 30V : 1V = 29.54dB = NORMAL AV SHORTED or LEAKAGE OUTPUT: INPUT = 0V : 1V = -INFINITE dB relay will be disconnect Regard Analog guy |
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24th September 2006, 07:13 PM
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#9 |
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diyAudio Member
Join Date: Jul 2006
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Hi,
I own one of these Aura amps. There is a problem: the servis guy who has repaired a problem with source selector (it is working now) didn't have a spare part for another problem. So he bypassed something that stabilize amplifire (when I turn it on) before the signal comes to speakers. The result is when I turn it on there is a loud crackel in speakers even if the volume is set to minimum. Which part did he bypassed and where can I get it? Is there a substitute for this part? I can take a picture of interior of Aura if necessary. Thank You |
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25th September 2006, 01:26 AM
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#10 | |
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diyAudio Member
Join Date: Dec 2004
Location: Bukit Mertajam
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Quote:
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