Touch-type delay circuit using digital circuits (3)

It is a boron-made touch delay lamp made of CD4069 digital integrated circuit . It also uses the J-
wire wiring method, which can directly replace ordinary lighting switches without changing the original indoor wiring.
    When the human hand touches M, the stray signal induced by the human body is added to the input end of the inverter I through the inverter, causing
the flip output of the inverter j to become "o", and the capacitor c. Just charge through VD1 (f.1F is negative). The inverter II outputs a high
level "l", and the well is charged through R,'. This will cause the conduction
time of the thyristor switching circuit such as VT1 in the subsequent stage to be slightly delayed. Furthermore, the conduction of VT1 will cause the F drop of the DC current increase to c', resulting in insufficient charging, which affects the delay
time. Via R;, c. After a short delay, the inverter IV outputs a high level "1", deducing R. When VT1 is triggered to be turned on,
the bidirectional thyristor VTH is also turned on, and point F of the lamp lights up. After the human hand leaves the electrode sheet M, the inverter I
jumps to a high level "1", VD1 is cut off, and the capacitor C discharges through the resistor R. When the discharge ends, the inverter
II outputs a low level ".". The circuit is the same as the complex sword. In the original state, the thyristor VT1 and VTH are both turned off and the light E goes out
. LEDs can be used to illuminate at night to indicate switch positions for ease of use. The delay time of the circuit
    is determined by the discharge time constant of R.
Waist thyristor VTH. Therefore
, the load power of the circuit is relatively large, and it can drive electrical loads below oOOW and ooow. The 40 inverters I
~ IV can use a 6 inverter CD4069 digital integrated circuit. In this integrated block The input terminals of the other two unused inverters must
be grounded and must not be left floating, otherwise they may cause interference and damage the normal operation of the circuit.