7 - Segment LED Counter

7 - Segment LED Counter

R1-R7    7    470 Ohm 1/4 Watt Resistor   
U1    1    T74LS90 TL BCD Counter IC    7490,74HC90
U2    1    74LS47 TTL Seven Segment Display Driver IC    7447,74HC47
DISP1    1    Common Anode 7 Segment LED Display   
MISC    1    Board, Sockets For ICs, Wire

Notes

   1. All pulses to be counted are to be TTL compatible. They should not exeed 5V and not fall below ground.

   2. You can add more digits by building a second (or third, or fourth, etc...) circuit and connecting the pin 11-6 junction of the 74LS90 and 74LS47 to pin 14 of the 74LS90 in the other circuit. You can keep expanding this way to as many digits as you want.\

Capacitor of 0.1 uF between pin14 and pin11 ( between two 74LS90 ICs )

Monostable Multivibrator 555 Timer

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