venkates2218
Full Member level 6
Concept of this circuit is..
When the circuit is powered on the LED will glow continuously.Similarly when the BC557 is switched ON by RB0,RB1 will go to high state.I used voltage divider to get 4.9V from 12v supply and given to RB1.I tried this circuit practically but when I connect the BC557's emitter terminal to voltage divider means,I can't get 4.9V,it dropping to 1.7V...
My doubt is why voltage dropping occur at BC557 and is this circuit is correct..?or have to make any changes in this circuit..?