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Old 25th April 2019, 04:19 AM   #1151
AKSA is offline AKSA  Australia
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Hi Prasi,

I have reworked it for best performance, but there are limitations with only 12V and a stiff 32R load. Both limitations increase the THD but the harmonic profile is still very good, with typical THD of 0.03% at 1Vpp into 32R load at 1KHz. H2 is dominant.

At 32R load you are limited to an output of about 2Vpp. At higher impedance loads, such as a 280R Beyerdynamic, your output voltage rises to 9.2Vpp, which is very loud indeed.

Your resistor divider for the input voltage reference is a little off, and you should use a bias resistor of 22k, rather than 10k, to minimise changes to the divider reference voltage.

The adjusted schem is attached. Nice circuit, sounds wonderful!

Hugh
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Old 25th April 2019, 06:11 AM   #1152
prasi is offline prasi  India
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Aspen Headphone Amp
Quote:
Originally Posted by AKSA View Post
Hi Prasi,

I have reworked it for best performance, but there are limitations with only 12V and a stiff 32R load. Both limitations increase the THD but the harmonic profile is still very good, with typical THD of 0.03% at 1Vpp into 32R load at 1KHz. H2 is dominant.

At 32R load you are limited to an output of about 2Vpp. At higher impedance loads, such as a 280R Beyerdynamic, your output voltage rises to 9.2Vpp, which is very loud indeed.

Your resistor divider for the input voltage reference is a little off, and you should use a bias resistor of 22k, rather than 10k, to minimise changes to the divider reference voltage.

The adjusted schem is attached. Nice circuit, sounds wonderful!

Hugh
Hi Hugh,
Thank you so much!
You are a master at this craft!
I will surely build it.
Thank you again.
Regards
Prasi
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