Related Products: LEDs and LED Lighting. The speed of the led flasher may be adjusted with potentiometer P1. Being an astable multivibrator, the circuit has no stable state but oscillates continuously ...

The brightness of the LEDs are dependent on the output voltage. Since the voltage regulator is variable, the brightness of the LEDs is also variable. Potentiometer P1 is used for rough adjustment ...

The ring light has 31 LEDs but only 12 pins, so there is some multiplexing going on. The modules come in pairs for about $20, so not a throwaway part, but they will really dress up anything that ...