do you think I could touch that heater in a metal plate like a cooker
there was a good reason i advised the use of peltier junctions for this project as the highest voltage one may come in contact with is dependent on the junction used but will nearly always be below 60 volts dc
You know what happens when you drive an "AC" heating element with DC?
controversy about the ways electric heaters are made
I see nothing wrong with putting DC through an AC heater, if you're careful.
Alright, then. Go for it!Despite what someone mentioned, I see nothing wrong with putting DC through an AC heater, if you're careful.I would guess you are going to use PWM to a digital pin, with that digital pin controlling an NPN power Darlington, giving the heater you plug in zero to full duty cycle pulses of 120 volts DC. The 120v DC would come from a full wave bridge rectifier on the AC line, with a large capacitor to smooth the ripple.If so, I would only say make sure:1 - Your power on/off switch is double pole to switch both 110v wires. Off should not leave one side connected, since a reversed plug could leave things hot with respect to ground.2 - You include a fuse or circuit breaker. If you don't have one and there is a short circuit, much current will flow, producing one heck of a vaporizing flash.3 - You include a bleeder resistor across the capacitor 120vdc to ground. Otherwise, like in some very old tv sets, you unplug it to work on it and come to the shocking realization that the 120v remains for quite some time (minutes, even)!4 - Use low enough gauge wire, not going through any breadboard pins.
if I want to increase the water in just 1°C, I think it will be much more easy to do the fine tune with a heat controller.
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