Simple LED advertising light circuit

1. Each 8050 transistor can drive eight to sixteen LEDs. Only LEDs with the same light-emitting voltage (different colors usually have different light-emitting voltages) can be used in parallel. The LEDs can be connected into the desired pattern to express the designer's intention.
2. The flashing cycle of the colored lights is: T=0.7×(R1+R3)×C2+0.7×(R2+R4)×C1. Select the parameters of R1, R2, R3, R4, C1, and C2 according to the flashing speed requirements. Adjusting the size of the potentiometers R1 and R2 can change the flashing speed.
3. Excessive voltage will burn out the LED. The working voltage starts from 3V. When the power supply voltage is higher than 5V, a 2.2-27 ohm resistor should be connected in series as a current limiting resistor to avoid burning out the LED.