Changes

A trigger diode is used in dimmer and AC control circuits. When connected to a voltage less than the trigger voltage, the diode is an open circuit. However, when the voltage across the diode reaches a certain voltage, it "triggers" and turns on, and stays on until the current is removed from through it.

A trigger diode is used in dimmer and AC control circuits. When connected to a voltage less than the trigger voltage, the diode is an open circuit. However, when the voltage across the diode reaches a certain voltage, it "triggers" and turns on, and stays on until the current is removed from through it.

== Varicap ==

=== Varicap ===

A vericap diode, also called a tuning diode, is a special diode who's capacitance changes in response to the reverse voltage across it. This kind of diode can be inserted into a radio tuning circuit, and the radio frequency of the tuned circuit can be adjusted by varying the voltage on the diode. Early portable digital tuning AM/FM radios used this method.

A vericap diode, also called a tuning diode, is a special diode who's capacitance changes in response to the reverse voltage across it. This kind of diode can be inserted into a radio tuning circuit, and the radio frequency of the tuned circuit can be adjusted by varying the voltage on the diode. Early portable digital tuning AM/FM radios used this method.