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DIY Sony VFET pt 2 (N-Channel Build)
DIY Sony VFET pt 2 (N-Channel Build)
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Old Today, 08:40 AM   #671
gpapag is offline gpapag  Greece
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DIY Sony VFET pt 2 (N-Channel Build)
Quote:
Originally Posted by MEPER View Post
10W/8ohm looks almost like a clipping amp?
Nominal output (continuous) power is specified -at best- at 1% THD.
At the 10W/8Ohm (nominal power for this amp) FFTs shown before, THD reads 0.76%, H2 0.22%, H3 0.7
Here is a -level increasing- distortion plot (REW RTA-stepped sine measurement, 0.1dB step, 997Hz signal, 256k FFT length, BH7 window, x2 average)

George
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File Type: jpg (256k) step level increasing-1200z.jpg (103.0 KB, 112 views)
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Old Today, 09:00 AM   #672
gpapag is offline gpapag  Greece
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DIY Sony VFET pt 2 (N-Channel Build)
This is the dummy load I use.
For 8 Ohm, I parallel the two 16 Ohm sections.
Long continuous signal testing at 10W does not increase the temperature of the elements more than 2-3 degrees Celcius.

George
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File Type: jpg my dummy load.JPG (669.8 KB, 111 views)
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Old Today, 07:47 PM   #673
Nelson Pass is offline Nelson Pass  United States
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DIY Sony VFET pt 2 (N-Channel Build)
Quote:
Originally Posted by Peppe View Post
I am just wondering if anyone can explain which one could be the source of such 100 Hz peak with a SMPS PSU.
Full wave rectification of 50 Hz AC line in switching supply.
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