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Old 14th September 2006, 04:02 PM   #1
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Thumbs up 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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Old 14th September 2006, 04:19 PM   #2
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Default Schematic

Aura VA100 II schematic, not include protection circuit (Patent Pending)

Thank
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Old 14th September 2006, 04:33 PM   #3
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Thumbs up Prototype PCB

Prototype PCB, protel again !

Regard
analog guy
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Old 14th September 2006, 04:45 PM   #4
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Thumbs up 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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Old 14th September 2006, 05:47 PM   #5
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Nice AMP. Go!
Regards zeoN_Rider
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Old 15th September 2006, 02:44 AM   #6
Leolabs is offline Leolabs  Malaysia
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Selamat Pagi!

Where did you get it??Seem that yo always get the chance to deal with good quality amps.
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Old 15th September 2006, 04:23 AM   #7
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Thumbs up 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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Old 15th September 2006, 08:20 PM   #8
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Default 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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Old 24th September 2006, 07:13 PM   #9
Mitko1 is offline Mitko1  Slovenia
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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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Old 25th September 2006, 01:26 AM   #10
Leolabs is offline Leolabs  Malaysia
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Quote:
Originally posted by Mitko1
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
Possibly the protection circuitry.
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