Any suggestions as to how to amplify the signal?
By ADC, are you referring to the DAC on the Duo? Does this mean the Duo can't output a constant 1.2345 V signal, for example? Anyone, I think the correct road to go down is using a capacitor as a low-pass filter for the standard PWM. I could get this working first with PWM only, then try to add the filter.
I don't know if the Due can output exactly 1.2345 VDC. However, since it's DAC has 12-bit resolution that means there are 4,096 distinct voltage levels it can output between 0 and 3.3 VDC. So even if it cant output that specific value it can get very close
Or you could use an op-amp based non-inverting amplifier with a voltage gain of about 3.85
That is good enough, it doesn't need to be very close. From the early description of the DAC I thought this might only output a wave, for example, a smooth wave between 0 and 1.2345 V at a specific frequency.
Can you tell me more about this? I am a software guy. I see some very cheap op-amps online, but they all have much larger voltage gains. Also, why 3.85? 3.3V (or 5V) + 3.85V is less than 10V
Can you post an example of an amplifier similar to what might work to give me a better idea?