Touch switches have already gained a detailed understanding in our daily lives, so in the family of switch components, there is a special category of switches, which is the small category of self-locking switches,

What is the difference between a single button self-locking switch and a self-locking switch with lights? A self-locking switch is a device that locks the circuit switch status through the mechanical device of the switch itself. When you press the button for the first time, the circuit is connected, and when you press the button again, it pops up and the circuit is disconnected. It is called a self-locking switch. Early televisions and monitors that were completely powered off directly used this type of switch.

The single key self-locking switch mainly exhibits the following aspects:

1. No action when powered on.

Press and release the 2 buttons, and the relay will engage.

When the 3 buttons are pressed for a long time, the relay is released, and when released, the relay is engaged.

When the 4 buttons are pressed on time, the relay releases and engages in a cyclic action.

Because there is a voltage drop in the 47Q resistor, the relay can use DC9V.

So there is another type of self-locking switch with a light, as the name suggests, which adds a light to the original self-locking switch. The difference between a self-locking switch with a light and a regular self-locking switch is only that the light switch fully utilizes the space in its button to place a small indicator light bulb or LED, with one end connected to the neutral line and the other end generally connected in parallel with the normally open contact of the switch through a step-down resistor. When the switch is closed, While the device is running, it also provides power for the indicator lights. Of course, both can be applied in daily life, but the required effects vary depending on the application scenario.