Hi all, I came across this circuit in websearch. i understood the operation but i didnt understand the need of diodes ? Could some one please explain.
https://drive.google.com/open?id=1T7MP6Tk83cLQXzGv23hpdeMoc0DmA_zt
https://drive.google.com/open?id=1T7MP6Tk83cLQXzGv23hpdeMoc0DmA_zt