1. This project designs a digital counter circuit that counts from 1 to 99 using logic components like timers, transistors, and displays.
2. The circuit is powered by a 5V voltage regulator and uses a 555 timer to generate pulses that operate the first counter. Transistors create a gate for the second counter.
3. The output from the counters is decoded by BCD converters and converted to a value that is displayed on a 7-segment screen, showing the counting from 1 to 99.
1. This project designs a digital counter circuit that counts from 1 to 99 using logic components like timers, transistors, and displays.
2. The circuit is powered by a 5V voltage regulator and uses a 555 timer to generate pulses that operate the first counter. Transistors create a gate for the second counter.
3. The output from the counters is decoded by BCD converters and converted to a value that is displayed on a 7-segment screen, showing the counting from 1 to 99.
1. This project designs a digital counter circuit that counts from 1 to 99 using logic components like timers, transistors, and displays.
2. The circuit is powered by a 5V voltage regulator and uses a 555 timer to generate pulses that operate the first counter. Transistors create a gate for the second counter.
3. The output from the counters is decoded by BCD converters and converted to a value that is displayed on a 7-segment screen, showing the counting from 1 to 99.
1. This project designs a digital counter circuit that counts from 1 to 99 using logic components like timers, transistors, and displays.
2. The circuit is powered by a 5V voltage regulator and uses a 555 timer to generate pulses that operate the first counter. Transistors create a gate for the second counter.
3. The output from the counters is decoded by BCD converters and converted to a value that is displayed on a 7-segment screen, showing the counting from 1 to 99.
Supervisors: Dr. Maged Aldhaeebi Digital System design project
Summer2022
Outline:
Introduction.
Simulation Study.
Results and discussion.
Summary.
Abstract:
In this section we will use logical circuits to work counter for numbers from 1 to 99 through program protes.
Introduction :
Applications:
1- This project works as a digital counter or a timer by using a specific circuit from a group
of electronic and logical components. The importance of this project is that it is used in
digital clocks to know the time, which is the most important thing that a person has and
other important applications.
The steps of the work:
It was about making calculations for some parts to know their values and knowing the work of some components and how they work and linking them through his data sheet.
The project consists of three sections:
A- The circuit feeding section with 5 volts and the basis of this operation is the voltage regulator 7805. B- Department of pulse generation based on the NE555 timer. Digital System design project
C- Section decoding and analyzing the code and displaying it on the digital screen (counter, PCD, 7 segment).
Simulation Study:
Voltage Regulator 7805:
The voltage regulator works with the two capacitors to feed the logic circuits with 5 volts to do their work.
Timer 555:
The basis of the circuit work is the 555 timer, where its time is set for a second for each
(Ton-Toff) by the resistor 10k and 90k ohm with the capacitor 10 microfarad. As for the
number one, it is connected to the negative and number 8 and 4 are connected together
with the source voltage, and number 5 is connected to the capacitor 0.01 microfarads
with the ground, and the number 3 is the output from which the pulses come out. Digital System design project
TTL2n2222:
As for these two transistors, we made a gate and a gate to feed the second counter to continue counting after the number 9.
Counter 74LS390:
The digital clock starts its work from counter No. 74LS390 and this IC contains two counters
and each counter contains four bit outputs (BIT) and these outputs are connected to the display
IC of the 7-SEGMENT screen.
Digital System design project
BCD Converter:
Which is numbered (CD4511), where this IC contains seven outputs that are connected
with the 7-SEGMENT screen to operate it.
Results and discussion:
1- We got the voltage required to feed the circuit from the voltage regulator which is 5v. Digital System design project
2-The two diodes connected to the 555 timer elements are designed to speed up the charging and discharging process.
3- We were able to generate pulses from the 555 timer and project them to the first counter. Digital System design project
3-The 7-Sigment screen showed us the required numbers after the BCD had decoded the Binary code and converted it to a value.
Summary :
1-The circuit is fed by a voltage regulator.
2-Sending pulses from the timer to operate the first counter. 3-A gate was made by transistors and made into the second counter. 4-The output from the first and second counters passes through their respective BCD to decode the binary code and convert it to a value and then display it on the 7-Segment screen of the common cathode type. Finaly Obtaining a digital counter that counts from 0 to 99 and then returns to zero. This counter can be used in the manufacture of timers, watches and other electronic devices. Digital System design project
