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Old 25th February 2015, 01:43 PM   #1
waso is offline waso  Russian Federation
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Default Nataly eXPerience. Without compromise.

This is the last in the series of my amplifiers "Nataly" development today. It used all the useful insights that were used in previous versions and takes into account the nuances of correction. Used SuperA mode output stage, which can significantly reduce the distortion of higher order. The amplifier is equipped with a limiter, protection of the output stage, the signal compensation on the speaker wires.
The first stage of the amplifier performs the function of the doubling of the input voltage, and a peak limiter. The output of the operational amplifier is loaded on the buffer stage, preserving the work of the Operational Amplifier in class A.Main stage is inverting composite amplifier. Such a construction eliminates the common-mode voltage at the inputs of the Operational amplifier. In the summing point also receives the correction signals zero amplifier output from the integrator, double inverted voltage drop on the "ground" speaker wire for the virtual removal of the speaker wires from the system. The voltage amplifier has a gain of 5.1 kω\470 Ohm ) +1, it is protected from overload by output current when the protection operation.
The BIAS source is controlled dynamically, the control circuit the quiescent current support output transistors in active mode.
Peak limiter monitors emerging at the time limitation of output signal output voltage output OP4, decreases the gain of the first stage (OP1) and served a light signal to the user.
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Last edited by waso; 25th February 2015 at 02:48 PM.
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Old 3rd April 2015, 09:43 AM   #2
waso is offline waso  Russian Federation
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Let's started!
Please use online translator from russian for reading.
Nataly Experience - ???????? ????????? - ????? ?? ????????????????
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Old 3rd April 2015, 10:50 AM   #3
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Hi!
Great!
do you have distortion spectrum measurement or simulated graph?
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regards, Pawel
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Old 3rd April 2015, 12:11 PM   #4
waso is offline waso  Russian Federation
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Because Assembly into the finished design is not yet completed, measurements are premature . But expect about 0.0005% of and less of.
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Old 3rd April 2015, 12:37 PM   #5
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Interesting. Another amp inspired by Eric Margan's idea.
See also Linear Audio | your tech audio resource
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Old 3rd April 2015, 12:53 PM   #6
waso is offline waso  Russian Federation
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It was one of many ideas used in this amplifier, but it has been significantly improved to work well in a real environment and it does not burden the stages of the amplifier voltage.
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Old 5th April 2015, 10:31 AM   #7
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Waso, there is a version with (fast) optocouplers in the bias loop. Is it also your design?
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Old 5th April 2015, 12:52 PM   #8
waso is offline waso  Russian Federation
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Yes, it is my design.
Complete electrical isolation of the control circuitry from the signal.
But because of the variation in specific optocouplers reproducibility of the results was not very good, had to do an exact fit.
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