I saw one circuit which connected one 100uF capacitor and one schottky diode as mentioned in the below circuit diagram. It has a negative logic rectangular pulse at cathode of the LED, which is providing ground for the LED.
I tested that circuit but I was not able to understand why they used a capacitor and schottky for this circuit for LED blinking, even that the LED can blink directly if we connected VCC to the LED anode. I attached one screenshot of the oscilloscope:
Node B is yellow signal Node A is green signal
- What is the advantage of this circuit?
- Is that giving more voltage variation for the LED to turn on?
- Is that a LED flashing circuit?
- Is it increasing the brightness of the LED?
After reading the all comments I had one idea, that it might be an LED Brightness circuit.
For that I closed all light of my lab, took a close picture of led, which I am going to share with you. I don't know if it is a right answer but it is quite enough to say it is a LED brightness circuit.