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Hello, and thank you for responding.

If I understand your response correctly, you are suggesting controlling the peltier temperature by varying the duty cycle of the current, right?

I initially wanted to go down this route, but after reviewing an old video of the experimental setup (before it broke) running, I was discouraged.

The reason being, one of the temperature settings that the old experimental setup was able to support was varying temperature in a sinusoidal manner.

In the video where the old setup is outputting sinusoidally varying temperature, it does seem like there is current modulation going on.

To be specific, it seems like the DC power supply that has a 'positive' voltage gradually increases its current at a rate proportional to the required rate of heating, and vice versa for the 'negative' Voltage DC power supply. There is negligible current coming from one DC power supply when the other is currently cooling/heating.

Given this, would doing pulse width modulation on the DC power supply achieve the same effect as current modulation even if the required temperature output is constantly changing in the form of a sinusoid?

Thank you.