Lamp dimmer. The figure below shows the circuit can be used for lamp dimming. It uses a small quantity of components, which can be installed inside the lamp seat. The circuit is commonly used in RC phase shift circuit. W can be adjusted to change the triac conduction angle, which changes the lamp brightness. KS is a bi-directional trigger diode . C2 and L are anti-jamming devices. You can simplify the circuit if you do not ask more, such as reducing components, eliminating C2 and L2.
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