Based on 555 pyroelectric infrared sensing and light control delay power saving socket circuit

inductance

As shown in the figure, the circuit diagram of 555 pyroelectric infrared sensing and light-controlled delay power-saving socket adopts TO-5 metal package, and the small window on the top surface of the casing and its transparent sheet can penetrate the infrared spectrum of 7-10μm. In order to increase the infrared detection distance, a Fresnel lens is installed in front of P228, so that the remote sensing distance can be opened at l0m. An FET (Field Effect) tube matcher is provided in P228. This device has an extremely high input impedance and a very low output impedance. This provides great convenience for the amplifiers it is connected to. The frequency of the sensing signal when the human body moves by P228 is approximately in the range of 0.3--5 Hz. Accordingly, a high gain low frequency amplifier that amplifies the weak signal can be designed.