FL2K replace MT34TL/AS11D buck chip with LDO

Sylvain Munaut 246tnt at gmail.com
Fri Feb 8 18:54:47 UTC 2019


I have managed to replace both buck DC-DC converters with  AMS1117 3.3 &
> lm317 linear regulators and I successfully got rid of the mentioned 1 MHz
> buck converter clock to obtain as pure a signal as possible. Do not expect
> miracles as the DAC's are 8-bit and have a best case SNR of -48dB, but
> getting the sideband modulation out of the signal surely improves the
> resulting spectrum a lot.

Well they might be 8 bits, but they're massively oversampled for HF, so
with good filtering and noise shaping, you can get more SNR.


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