Guys, my first post, I need help on my circuit. basically this circuit is the TTL AND & OR. On the circuit attached, you will find out that R4 and R8 are missing. I really don't know what resistance to use in order for the LED bulb (red) to light properly without being damage. Please help me guys I know this is easy, it's just that I'm really new to this and need more experience. Thanks!
PS. Nevermind the value of R8, I just place a random resistor there just to have a resistor, I still need to know what R8 should I use.
-Lex_ph
PS. Nevermind the value of R8, I just place a random resistor there just to have a resistor, I still need to know what R8 should I use.
-Lex_ph