A very simple toaster oven costs about $20. While the most consumer electrical appliances have microcontrollers inside. This oven is pretty much mechanically controlled. It has two quartz heating elements, 500W each (measured around 4.5A each), at the top and the bottom. A spring winded mechanical timer sets time up to 30min or staying on. The timer is more or less accurate. The mechanical timer switches the live AC wire.
The neural wire goes to the temperature control knob, which turns to set the temperature up to 450F in the toast mode, which both heat elements are on. Turning further to the brake and the broil mode to turn on the bottom and the top respectively, no temperature control in these two modes. The temperature control by a heat activated switch. It does not sense the oven temperature, instead a current passes through a metal strip, which can be seen glow red, to actuate the switch.
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