LED-யை பயன்படுத்தி AC DC கண்டுபிடிப்பது எப்படி? LED based AC DC & Polarity Finder Circuit
Channel: தொழில்நுட்பம் தமிழ் - Thozhilnutpam Tamil
Date: 24/03/2019

Simple circuit based on two LEDs and a potentiometer. 
Can be used to find whether voltage between any two points is AC or DC.
Can be used as a polarity finder(to identify +ve and -ve terminals) in the case of DC Voltage .
Can be used up to 230V with a 47K potentiometer. Potentiometer can be changed based on the needs.
Place the terminals T1 and T2 at any two points in a circuit and adjust the potentiometer to find whether the voltage between the points is AC or DC. 
Educative and Practical circuit.

**** Complete insulation is necessary before using the circuit in higher voltages (LIVE circuits). ****