USB power supply, the diode LED light is shining, and the triode has a current amplification effect. The essence is that the triode can control the larger change in the collector current with a small change in the base current, and uses the rectification effect of the capacitor to turn on at a predetermined time. Or turn off the semiconductor switching element. Due to the principle of the transiently stable multivibrator, one triode will be turned on first, and due to the influence of capacitor charging, the other triode will be turned on after a delay, and the previous triode will be turned off.
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