7 Segment LED Counter Circuit

Schematic -


7 Segment Reference -

Parts List -
R1-R7 - 7 - 470 Ohm 1/4 Watt Resistor
U1 - 1 - 74LS90 TTL BCD Counter IC
U2 - 1 - 74LS47 TTL Seven Segment Display Driver IC
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.

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