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The 'Boucherot' filter is also known as
the 'Zobel' filter in HiFi amp output stages.
Am 24.09.2020 um 22:49 schrieb Klaus
As you wrote, you are loading the
output with 4.7 ohms in series with cap. Which results, as your
indications say, in an LPF at minus 3dB @ 50KHz.
I have currently no way of verifying
that. I don't have my Ham Radio Laptop at hand right now
with the simulation software. It is just my guess.
So, maybe I'm wrong. In such case: forgive me ;-)
Am 24.09.2020 um 22:36 schrieb Ad
I don't think that the interference comes from spurious
switching signals from a class D amplifier: the 2.4 MHz signals
when loading the output with a low enough resistance, i.e. no
high-frequency filtering at all. The filter I applied also
doesn't really filter out HF signals, it just loads the output
with 4.7 ohm for frequencies over roughly 50 kHz, this being the
3 dB cutoff point. So I still think that the output stage is
oscillating under certain circumstances, be it a class D
amplifier or something else.