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On A Hippie Trail, Head Full Of Zombie
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Old Yesterday, 03:35 AM   #211
2 picoDumbs is online now 2 picoDumbs  Australia
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On A Hippie Trail, Head Full Of Zombie
Default Distortion, and Power Supply Measurements

Retesting amp with powersupply instead of sissy lab powersupply and the distortion level has dropped from 0.17% to 0.11%.
Maybe the lab supply was causing compression due to current limiting circuit or maybe the lower rail voltages 22V of the lab supply is the reason.

Well the result is pleasing.



Redo FFT next and compare noise on output vs Firstwatt F5.
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Last edited by 2 picoDumbs; Yesterday at 03:48 AM.
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Old Yesterday, 03:45 AM   #212
2 picoDumbs is online now 2 picoDumbs  Australia
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Noise at output referenced to 2.82V rms (1W) output is around -96dB at 100Hz (rectified 50Hz AC)
Awesome result. I am bloody happy with that.
I can change the y axis and show power supply harmonics below 100dB if people are interested.

I will test Firstwatt F5 for comparison next.
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"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass

Last edited by 2 picoDumbs; Yesterday at 04:12 AM.
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Old Yesterday, 04:43 AM   #213
2 picoDumbs is online now 2 picoDumbs  Australia
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Firstwatt F5
Powersupply noise at output is around -85dB dB down referenced to 2.82V rms (1W)
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File Type: jpg 15826058713553252420632198432349.jpg (236.0 KB, 86 views)
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"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass

Last edited by 2 picoDumbs; Yesterday at 04:46 AM.
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Old Yesterday, 06:14 AM   #214
generg is offline generg  Germany
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Well done Pico,

H2 neg or pos phase?

:--))
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and the First Wtt is......a really First Class PSS Idea
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Old Yesterday, 06:55 AM   #215
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I went with negative.
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