LED Lantern II

Circuit Operation Principle The LED color light circuit consists of a multivibrator and an LED drive control circuit, as shown in Figure 1-158.

The multivibrator circuit is composed of a potentiometer RP, resistors R1, R2, a capacitor C, and a time base integrated circuit IC1.
The LED drive control circuit is composed of a time base integrated circuit IC2, a transistor Vl-V6, a diode VDl-VD8, a resistor R3-R14 and a light emitting diode VLl-VL3l.
After the power switch S is turned on, the multivibrator oscillates to provide a count pulse signal for IC2. Under the action of the counting pulse, IC2 outputs the high level in turn in turn, and the VLl-VL31 circulates through VDl-VD8, R3-R14 and Vl-V6.
When the YO terminal of IC2 outputs a high level, Vl is turned on, and VLl is lit.
When the Y1 terminal and the Y9 terminal of IC2 output a high level, V2 is turned on, and VL2-VL7 is lit.
When the Y2 terminal and the Y8 terminal of IC2 output a high level, V3 is turned on, and VL8-VLl3 is lit.
When the W terminal and the Y6 terminal of lC2 output a high level, V5 is turned on, and VL2O-VL25 is lit.
When the Y5 terminal of IC2 outputs a high level, V6 is turned on, and VL26-VL31 is lit.
As a result of this cycle, each LED light-emitting diode flashes.
Adjusting the resistance of the RP can change the blinking frequency of the LED.
Component selection
Rl-R14 uses 1/4W metal film resistor or carbon film resistor.
The RP uses a solid variable resistor.
C selects an aluminum electrolytic capacitor with a withstand voltage of 16V.
VDl-VD8 selects 1N4148 type silicon switch diode for use.
VLl-VL31 selects high brightness LEDs of d3mm or φ5mm.
Vl-V6 selects S805O or C8050 silicon NPN transistor.
ICl selects NE555 type time base integrated circuit; IC2 selects CD4017 or CC4017 type decimal counting/pulse distributor integrated circuit.
S uses a single-pole toggle switch.