Make a bedside delay lamp with CD

In the figure, inverters I, II, R1, R2, CI and SB form a bistable trigger switch . Every time switch SB is pressed,
the output level of inverter II changes once. R3, C2, VD1 and inverting noise ⅡI, Ⅳ form a monostable delay circuit. Adjusting
the value of R3 or C2 can change the delay time of the circuit. Inverters V and VI are used in parallel to increase their driving capability.
The transistor VT and the peripheral resistor form a thyristor vs zero-crossing trigger circuit. When vs is on, the lamp H lights up: when vs is off,
the lamp H goes out. The 220V AC mains power is stepped down by resistor R8, rectified by diodes VD4 and VD5, and stabilized by VD6 to output a stable
6V DC voltage for use by the entire circuit.