I have a cheap 120V hot plate that I assume regulates its temperature using a triac dimmer (because the heating element vibrates/hums at lower settings). But at its lowest setting it still gets too hot for my application.
So my first reaction is to put another household dimmer between the device and the power. But I'm not sure how the second triac in the series will behave if it's seeing chopped AC from the first.
I think the capacitors in the second triac are going to hold their charge between "cuts," and so the cumulative effect of the dimmers will be multiplicative as expected: I.e., if both are set to "half" power the device will see "quarter" power. Is that correct? Or is it not that simple?