/diy/ - Do It Yourself

Anonymous Thu Nov 1 04:28:26 2018 No.1489973 [View]
File: 3 KB, 366x194, charge_pump_inv.png [View same] [iqdb] [saucenao] [google]

>>1489917
If you want to run it all from 3.3V, rail splitting is not an option but you can generate a negative voltage with a standard charge pump circuit powered by a GPIO pin. You can then connect the Vref pin of the amp to the common GND and the negative supply does not need to be that stable. D1 and D2 should be Schottky diodes like the (cheap) 1N5817 because you lose 2Vf. The supply current of the AD8221 is only about 1mA.

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/diy/ - Do It Yourself

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