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Old 19th March 2013, 06:20 PM   #1401
kroyin is offline kroyin  India
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I tried increasing r4 on both halves from 221k to 2x221k did not work.
Worth decreasing R1 to 10k ?
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Old 19th March 2013, 06:52 PM   #1402
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it must work , even if I wouldn't go to double value

you didn't make something right
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Old 20th March 2013, 09:37 AM   #1403
kroyin is offline kroyin  India
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In my understanding (perhaps flawed ) gain is set by a combination of feedback resistor,input resistor & resistor to ground.I rechecked their values and they are proper.
Increasing feedback resistor,decreasing input resistor (whatever I do) gives me additional 1VAC gain.

I must have done something wrong. Any other parts of the circuit that affects gain
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Old 20th March 2013, 09:43 AM   #1404
Zen Mod is offline Zen Mod  Serbia
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ref. to original Pa's circuit , ratio of R4/R1 is defining CLG of amp

that's 221K/22K1

you can freely ignore R2 (221K) from that
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Old 20th March 2013, 04:24 PM   #1405
kroyin is offline kroyin  India
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Problem resolved...

I had explicitly grounded the daughter board to PSU.

I was trying out ARTA & it gave me a THD of 0.48% at 2.8V.
Generally I was unhappy

As part of fiddling process the ground wire came loose & to my surprise the THD dropped to .038%.

Whipped out my multimeter
Relative DC 12mV
Absolute DC -130mV
Gain 20dB

ARCHIMEDES MOMENT

Arta measurements attached
Attached Files
File Type: pdf arta_jx.pdf (292.6 KB, 133 views)
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Last edited by kroyin; 20th March 2013 at 04:33 PM.
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