Apparently #Arduino ATMega328 #AVR #microcontrollers can sample at 38ksps if you set the ADC clock divider to 32 (16MHz ÷ 32 = 500kHz, and then you need 14 clocks per sample), and still have an ENOB of about 9.5. Not exactly high #precision #electronics but often adequate. And if you’re willing to accept more noise you can do 76ksps with an ENOB of about 8.7. Higher sample rates produce audible clicks when used for audio.