Hi,
I am using a pic16f877a mcu and a 6v 400mA power supply with a lm317 variable voltage regulator. i am using the pic to light four leds in a specified sequence. the circuit works perfectly as desired until i connect another IC , (a 7447 decoder/driver) to the power supply. instantly the pic halts and stops working. the moment i remove the other ic the pic resume its task asif nothing happened.
i measured the current and voltage supplied to the pic before and after inserting the IC and found the following:
before :
10mA @ 4.85 v
after :
4mA @ 4.66 v
the current is not even reaching the maximum 400mA so why is this happening.
does the pic need a detecated power supply or what?
I am using a pic16f877a mcu and a 6v 400mA power supply with a lm317 variable voltage regulator. i am using the pic to light four leds in a specified sequence. the circuit works perfectly as desired until i connect another IC , (a 7447 decoder/driver) to the power supply. instantly the pic halts and stops working. the moment i remove the other ic the pic resume its task asif nothing happened.
i measured the current and voltage supplied to the pic before and after inserting the IC and found the following:
before :
10mA @ 4.85 v
after :
4mA @ 4.66 v
the current is not even reaching the maximum 400mA so why is this happening.
does the pic need a detecated power supply or what?