Hi,
Knowing some tricks of previous posts, I designed a simple NiCd charger (constant current). I tried to use very less and inexpensive parts and tried to get few more feature. Like I used a same LED for Vref which is 1.8V and same LED for power indicator too. Like in the attached schematic, when the load is connected, it's working very well as its calculation with 50mA constant current and LED is also glowing normally.
But when I disconnect the load then LED turns OFF fully. Wow, it's working as 'charging or load connected indicator' instead of just power indicator, so cool!
How the amazing thing happened? Please tell the operation in simple.