Dual flashing string circuit (2)

It is a general-purpose flashing light string controller controlled by a unidirectional thyristor
. The diodes VTI and VT2 are connected to a self-contained oscillator. After power is turned on, VT1 and VI12 take turns to turn on and off alternately. When VT1 is turned on and VT2
is turned off, the DC power is injected into the door panel of the one- way thyristor VT3
through R; ED1 goes out, VT3 loses trigger current and turns off, and E1 goes out. At the same time, the DC power is injected into the f J pole of the unidirectional thyristor VF4 through R, I:D2 , so that V D4 turns on the light string E2 and lights up, so the curved light strings El and F:2 alternately flicker, light up and turn off. LED tube I. F:r)l and LFD2 play an indicating role, and the bright flame of "J" is synchronized with the light string {:l and F2. The RP changes the oscillation frequency of the white-excited multivibrator, so the lamp can be half-lit. The cross frequency.     MCRI is used for VT3 and VT4..-S type and other small plastic-encapsulated single BJ thyristors. f. It is required to use (:1-1H 400V polypropylene capacitors and other non-component components. Five special requirements.