Use CD4069 to make touch delay energy-saving lamps

M is a touch electrode piece. When a human hand touches M, the clutter signal induced by the human body is added to
the input end of the inverter I through R1 and R2, causing the flip output of the inverter I to become "O", and the capacitor CI passes through VD1 Charging (positive up and negative down), the inverter II
outputs a high level "l one" and charges C3 through R5. This will cause the conduction
time to lag slightly, otherwise The turn-on of VSL will cause insufficient charging of CI due to the drop in DC voltage, which will affect the delay time. After
a short delay by R5 and C3, the inverter IV outputs a high level "l", and R7 triggers VSI to turn on, and the triac VS2 It is also
turned on, and point H of the electric lamp emits light.
    When the human hand leaves the electrode sheet M, the inverter I jumps to the high level "l", VDI is cut off, and the capacitor Cl
is discharged through the resistor R4. When the discharge ends, the inverter II outputs low level "0", the circuit returns to its original state, the thyristors VS1 and VS2
are both turned off, and the lamp H goes out.
    From the above analysis, it can be seen that the delay time of the circuit is mainly determined by the discharge time constant of R4 and CI, and Other
parameters of the circuit are irrelevant, thus ensuring the accuracy of the delay time. Another feature of this circuit is that the medium
-power triac VS2 is driven by a small one-way thyristor VS1, so the circuit has a large load power and can drive 500w and electrical loads below 500W
. In addition to driving incandescent lamps, this circuit can also be used to drive small motors to make a touch-type exhaust
fan delay switch.