Schematics > Miscellaneous > 7 Segment LED Counter
7 Segment LED CounterThis simple counter can be used to count pulses, as the basis for a customer
counter (like you see at the doors of some stores), or for anything else that
may be counted. The circuit accepts any TTL compatible logic signal, and can be
expanded easily (see Notes).
Schematic
7 Segment Display Reference
Parts:
| Part |
Total Qty. |
Description |
Substitutions |
| R1-R7 |
7 |
470 Ohm 1/4 Watt Resistor |
|
| U1 |
1 |
74LS90 TTL 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 |
|
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.
Title: 7 Segment LED Counter
Source: www.aaroncake.net/circuits/
Published on: 2005-02-10
Reads: 1034
Print version:  Other schematics from Miscellaneous
Whistle Responder Nocturnal Animals Whisker Programmable Digital Code Lock S-video to RCA Simple Lie Detector SmartCard PC Emulator Economical Pump Controller One-IC two-tones Siren Time Delay Relay II Economy radar detector
Schematics > Miscellaneous > 7 Segment LED Counter | 
Home
