Light chain circuit that glows along the four sides and from the inside out

It can control three groups of colored lights. Each group of colored lights is composed of many light bulbs connected in series, thus forming
a square and a "star wheel" with six kinds of light inside. When the power is turned on, the light
radiates along the four sides of the square and from the inside out. A three-stage multivibrator is composed
    of triodes VTi ~ VT3, etc. The speed of shifting light ring depends on the value of the resistor-capacitor component connected to the base circuit of the triode
. The bulb is rated for 1V and 68mA.
    If you change the spatial arrangement of the colored lights, you can get different flashing effects of the colored lights .