FL2K replace MT34TL/AS11D buck chip with LDO

Ioannis Makris makrisj at gmail.com
Fri Feb 8 18:56:42 UTC 2019


Thanks for the tip!

On Fri, Feb 8, 2019, 20:54 Sylvain Munaut <246tnt at gmail.com> wrote:

> Hi,
>
> 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.
>
> Cheers,
>
>    Sylvain
>
>
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