Sheer Gray Panel Curtains

Contador Contador Digital Piano 0-999

74LS90 counter CD 4093.

In our setting is quite necessary to keep track auto industry either for the amount of product created or where we keep track of how many people go in one place among many more applications, for this we use an accountant who is a digital circuit capable of carrying a count up or down using a critical frequency with which it may carry an account in this circuit use a 74LS90 integrated circuit which is a 4-bit counter. The advantage of this chip is that your account goes from 0 to 9, its output is given in binary, this is where we use a binary to BCD decoder or in other words the 74LS47 decoder takes the binary numbers from the counter and can be adapted for viewing in a common anode display. In this case the frequency is given by a button, but the problem with this item because it gives small mechanical vibrations or logical errors which interfere greatly in the account for solving this problem is placing a CD CI 4093 a smith trigger nand gate which eliminates the rebound .

Used Components.

- 3 CI 74LS90.
- 3 CI 74LS47.
- 3 Display Common Anode
- 3 Ohm Resistor 100R 1 / 4 Watt.
- 5 Ohm Resistor 330R 1 / 4 Watt.
- 2 buttons.
- 1 CD CI 4093.
- 1 Led.