I would like to use Arduino sa waveform generator up to 220V and also high amperage. How can I amplify the DAC?
The common Arduino does not have a DAC.
It is particularly unsuitable as a waveform generator. To start with, you need a waveform generator chip, then you will want to amplify it.
Perhaps you need to start by explaining what sort of frequencies and waveforms you require, and the purpose?
Maybe also Google for "arduino single phase inverter"
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