555 designed sound-controlled delay table lamp working circuit diagram

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

Working principle: The above picture is the telephone desk lamp circuit. When the bell rings or picks up the phone at night, the light will automatically light up. After the machine hangs up, the 45s light will turn off automatically. It can be used as a general dimming table lamp in normal times, without switching. When using the delay light, just press the delay touch button, the light will be off after 45s delay. The circuit integrates multiple uses, and is mainly composed of a photoelectric coupling circuit, a light control circuit, a negative pulse generating circuit, a monostable trigger circuit, a thyristor switching circuit and a power supply circuit. In the figure, IC1 selects the 4-pin PC817 model; IC2 selects the NE555 equivalent type time base integrated circuit. VT is best to use 9014, 3DK4 and other switching tubes; VS selects 1A, 600V ~ 800V bidirectional thyristors, such as 97A6, 97A8 and other models; regulator tube is 1/2W 12V such as 2CW60. MG selects models such as MG45 with light resistance less than 1kΩ. C5 is best to use CBB poly propylene capacitors, withstand voltage of 400V or more. H uses a 25W or 45W bulb.