As shown in the figure, the lantern control circuit takes three 555 time base integrated circuits as the core, and constitutes a cyclic trigger one-shot delay circuit, which respectively controls the SCR loops of each channel to be turned on, and the lanterns are sequentially illuminated, which is like running water.
When IC1's 3 pin is high, SCR1 is turned on, and its control light is on. At the same time, the high potential of pin 3 charges C3 through R3. When the voltage charged to C3 is higher than the threshold level of 6 pin 2/3VDD When IC2 is set, the output is high, SCR2 is turned on, the light it controls is on, and at the same time, charging C3, ..., so loops, turns on, lights up.
SCR view light uses different power thyristors, 555 time base integrated circuit (555 timer is mainly composed of resistors and capacitors to form a charge and discharge circuit, and two comparators to detect the voltage on the capacitor to determine the output power Flat high and low and discharge switch tube. This is convenient to form a delay circuit from microseconds to tens of minutes, which can easily constitute a monostable trigger, multivibrator, Schmitt trigger, etc. Pulse generation or waveform conversion circuit.) Bipolar type, drive current up to 150mA.
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