Thyristor module is one of the most commonly used semiconductor devices because of its small size, simple structure and strong function.This device has been widely applied in various kinds of electronic equipment and electronic products, used as a rectifier, inverter, frequency, voltage regulator, contactless control of motor speed, motor excitation, non-contact switch and the power control, etc.
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Circuit Operation Principle The LED lantern circuit consists of a multivibrator A, a multivibrator B, and a light-emitting diode VLl-VLl2, as shown in Figure 1-159. 
Multivibrator A consists of resistors R5, R6, potentiometer RP1, capacitors C1, C2 and transistors V1, V2; multivibrator B consists of resistors R7, R8, potentiometer RP2, capacitors C3, C4 and transistor V3 And V4.
After the multivibrator A oscillates, the VLl-V flashing illumination is driven by R1 and R2; after the multivibrator B oscillates, the VL5-VLl2 blinking illumination is driven by R3 and R4.
By adjusting the resistance values ​​of RP1 and RP2, the duty ratios of the output waveforms of the multivibrator A and the multivibrator B can be changed, thereby changing the blinking effect of the LED.
Component selection
Rl-R4 selects 1/2W metal film resistor for use; R5-R8 selects 1/4W metal film resistor for use.
The RP1-RP2 uses a small solid potentiometer or a variable resistor.
Cl-C4 selects Aluminum Electrolytic Capacitors with a withstand voltage of 16V.
VLl-VLl2 selects φ5mm or φ8mm LEDs.
Vl-V4 selects S80SO or BC548 type silicon NPN transistor.
LED lights three
The LED lights introduced in this example can be adjusted in flashing speed to form a variety of beating lights patterns, and can also be used to decorate toys and bonsai.