[sdiy] In praise of the ATM STM32F303

[Richie Burnett]

Charge pump generating higher voltage V+ and V- rails for the audio op amps from the Usb voltage input, 

-Richie,

Sent from my Xperia SP on O2

---- MTG wrote ----

>What the heck would the MAX232 be for?  The neg voltage? Debug port?
>
>GB
>
>On 2/11/2016 10:43 PM, Loscha wrote:
>
>> Markus Fuller just uploaded another of his great series of teardown videos.
>>
>> Today's victim was the Waldorf Streichfett
>> https://www.youtube.com/watch?v=umXnCuVBwf0
>>
>> The entire synthesizer string machine is a single ARM STM32F303 chip.
>> There is a power supply chip, an op amp for the audio outs, crystal, but
>> the only computational device is the ARM
>>
>> http://www.st.com/web/en/catalog/mmc/FM141/SC1169/SS1576/LN1531
>>
>> Notable for Audio considerations is that the DACs are 12 bit. Given the
>> amount of beloved instruments that use 12 bit DACs, and the quality of
>> this machine, it hardly seems a limitation.
>>
>> /Edward
>>
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>>
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