How to make a 59-0 down counter?


Joined Feb 4, 2008
what is the function of the resistor at the emitter of the transistor? as a pull down resistor?
Yes, it pulls the input of the counter to 0V when the transistor is off. Without it the input will 'float'. A TTL chip would read a floating input as high but a MOS chip would have an unknown logic state.