Did some distortion testing today. Results are as follows:
Power,----THD
100mW, .086%
500mW, .19%
1W,------.31%
2W,------.32%
5W,------.37%
10W,-----.46%
13.25W,--.81%
16.5W,--1.74%
18.6W,--5.06%
I really expected less distortion at low levels, given the stellar performance of the driver and the light load that the output stage presents.
Ultimately, I think I will listen to the amp a bit with the speakers I intend to use with it and decide whether to build it or not.
Power,----THD
100mW, .086%
500mW, .19%
1W,------.31%
2W,------.32%
5W,------.37%
10W,-----.46%
13.25W,--.81%
16.5W,--1.74%
18.6W,--5.06%
I really expected less distortion at low levels, given the stellar performance of the driver and the light load that the output stage presents.
Ultimately, I think I will listen to the amp a bit with the speakers I intend to use with it and decide whether to build it or not.
But it doesn't glow. 🙁
But seriously, after I get done building the two sets of output transformers I have into amplifiers, I think I will go to the dark side and build a solid-state amp.
I measured output impedance today at 0.6 Ohms. Copper losses alone account for 0.53 Ohms so I would say that this is probably about as low as Zout can go without feedback around the transformer.
Next I'm going to look at the waveform at 1W output on the primary and compare to the secondary. I am seeing a lot of 2nd harmonic distortion at that level on the output and I have a hard time believing that there is that much 2nd harmonic on the primary at the mosfet source. I'm guessing that the transformer is the culprit. We'll see.
Next I'm going to look at the waveform at 1W output on the primary and compare to the secondary. I am seeing a lot of 2nd harmonic distortion at that level on the output and I have a hard time believing that there is that much 2nd harmonic on the primary at the mosfet source. I'm guessing that the transformer is the culprit. We'll see.
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