Price: $5.99
(as of Jun 06,2023 00:22:52 UTC – Details)
💎【Touch delay Power Saving Switch】:When in use, just touch the touch electrode with your finger, the light will light up, and it will automatically turn off after a delay of time. It can directly replace ordinary switches without changing the original wiring.
💡【Source of design ideas】Touch delay switch is widely used for automatic lighting in stairwells, bathrooms, corridors, warehouses, underground passages, garages and other places. This switch is an electronic switch without electric shock, which does not produce sparks, and is safer to use with combustible gas.
⚡【Supply voltage】: AC 220V
🎯【Circuit principle and introduction of key components】:
🎯【1】：VD1~VD4 and VS form the main circuit of the switch, and VT1 and VT2 form the switch control circuit. Usually, the base of VT2 has no human touch current injection, and is in the cut-off state. VD1~VD4 rectify and output 220V pulsating DC power through R3 to turn on VT1, VS is in the off state, and the light is not enough.
🎯【2】：When the human hand touches the electrode M, the leakage current of the human body is divided by R6, R5 and R4, and its positive half cycle turns on VT2, the charge stored in C1 is quickly discharged through VT2, VT1 is closed due to no base current, and VD1~ VD4 rectifies and outputs 220V pulsating DC current through R2 to make VS turn on, and the lamp HL is lit.
🎯【3】：When the human hand leaves the electrode M, VT2 is cut off because there is no base current, and the current of R3 begins to charge C1. At this time, the lamp is still in the lit state. When the voltage across C1 is charged to a certain value (about 0.6V) , VT1 is turned on again, VS loses the trigger voltage, when the alternating current crosses zero, it turns off and the light goes out.
🎯【4】：Changing the capacity of C1 can change the delay time when the light is turned off, and its capacity can be adjusted according to the occasion of use.
🍀【DIY Soldering Kit】: It is widely used in schools to help
💡【Source of design ideas】Touch delay switch is widely used for automatic lighting in stairwells, bathrooms, corridors, warehouses, underground passages, garages and other places. This switch is an electronic switch without electric shock, which does not produce sparks, and is safer to use with combustible gas.
⚡【Supply voltage】: AC 220V
🎯【1】：VD1~VD4 and VS form the main circuit of the switch, and VT1 and VT2 form the switch control circuit. Usually, the base of VT2 has no human touch current injection, and is in the cut-off state. VD1~VD4 rectify and output 220V pulsating DC power through R3 to turn on VT1, VS is in the off state, and the light is not enough.
🎯【2】：When the human hand touches the electrode M, the leakage current of the human body is divided by R6, R5 and R4, and its positive half cycle turns on VT2, the charge stored in C1 is quickly discharged through VT2, VT1 is closed due to no base current, and VD1~ VD4 rectifies and outputs 220V pulsating DC current through R2 to make VS turn on, and the lamp HL is lit.
🎯【3】：When the human hand leaves the electrode M, VT2 is cut off because there is no base current, and the current of R3 begins to charge C1. At this time, the lamp is still in the lit state. When the voltage across C1 is charged to a certain value (about 0.6V) , VT1 is turned on again, VS loses the trigger voltage, when the alternating current crosses zero, it turns off and the light goes out.
🎯【4】：Changing the capacity of C1 can change the delay time when the light is turned off, and its capacity can be adjusted according to the occasion of use.
