Table lamp touch switch circuit and production

If you add an inductive touch switch to your desk lamp , it will not only bring you fun when you use it, but also make it more convenient for you to use it.

The circuit of the device is shown in Figure 1. When a person touches the metal contact A, the noise signal on the human body is added to the ② pin of the time base circuit through C3, and the ② pin is triggered, the entire trigger flips, and the ③ pin outputs a high level. The output is added to the thyristor control electrode through the current limiting resistor R, and the thyristor VS is turned on, and ZD lights up.
When you need to turn off the light, touch the metal sheet B with your hand, and the induction signal is added to the ⑥ pin of the time base circuit through C4. The ⑥ pin is triggered, and the ③ pin outputs a low level. The thyristor loses the trigger current and is cut off, and the light goes out. C3 and C4 in the circuit are coupling capacitors, which can also prevent the numbness caused by the damage of individual components. C1, C1, VD, and VDW in the circuit form a 6V DC power supply.

Component selection and production
components list are shown in the table on the left.

This circuit is small in size and can be installed in a box. The circuit does not need to be debugged and generally succeeds in one go.