Multivibrator: Multivibrator is generally composed of triode or integrated circuit as the main component, while the multivibrator introduced in this example uses thyristor as the main control component, which can directly drive a load with relatively large capacity. String 7 The circuit is shown in the figure below, and its working principle is similar to that of triode multivibrator. Assume that SCR1 is turned on first when power is turned on. Because the voltage across C1 cannot change suddenly, the potential at point A is close to zero volts, and SCR2 is cut off because of no trigger voltage. Then the power supply charges C1 through R1 and SCR1, so that the potential at point A gradually increases. When UA reaches a certain amplitude, SCR2 is triggered through D2. After SCR2 is turned on, the voltage across C1 is added to the anode and cathode of SCR1 through D2 and the control electrode and cathode of SCR2, so that SCR1 is subjected to reverse pressure and turned off. After that, capacitor C2 is charged and discharged like C1, so that SCR2 is cut off again, SCR2 is turned on again, and the two sets of colored lights are lit alternately.
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