Download led flasher circuit

Adana Science and Technology University
Department of Electrical and Electronics Engineering
Electrical Circuit Lab Term Project
LED FLASHER CIRCUIT
1. INTRODUCTION
In this project, you are going to design a circuit to blink a led. This circuit consists of a first order RC
circuit and an op-amp. The blink period must determined by the capacitor and the resistor values.
1.1 Design Criteria’s
Design the circuit so that the led is on while the capacitor is charging, and off while the capacitor is
discharging. The blink period must be adjusted with a potentiometer. Protect the led from possible over
voltage. The initial blink period can be chosen arbitrary, but the effect of the potentiometer must be clearly
seen in a suitable time interval.
2. Rules and Regulations
During the project, you may use any types of resistors, potentiometers, capacitors, inductors, diodes, LED,
battery and op-amps. Other circuit components and integrated circuits are not allowed to use during the
implementation phase.
The project will be carried out by one student.
2.1. Preparation
In the preparation part, each group is required to present a proposed design solution for the project in a
report (pre-report). The report should also include simulation results illustrating the operation
of the circuit used in the design. The necessary calculations for each step (for example, resistor and
capacitor values, blink period of the led) should be described in the report clearly.
The deadline for submitting the pre-report will be announced. Please ask the laboratory assistant about the
date. Late submissions will be penalized.
2. 2. Implementation and Demonstration
In the implementation part, you will physically construct your circuit. All team members must attend the
construction together. The attendency will be consider during the lab performance grade.
You must provide your
pots, etc.) and bread-board.
own
circuit
components
(op-amps,
resistors,
capacitors,
NOTE: During the project you are going to submit two reports. In the pre-report you are required to give
the main blocks of your design with their schematics and simulation results. The second one is the final
report which contains information below.
3. Final Report
The
final
report
should
include
of the experiences gained during the project.
the
final
design,
results,
and
a
summary
NOTE: The objectives, results and the experiences should be presented clearly. This does not
mean a long report, but definitely a well-organized one. The final report should contain the
following sections:
1. Abstract and Introduction
2. Theory
2.1. Selection of equipment such as resistors, capacitors, inductors, op-amps etc.
2.2. Working principle of the project
3. Schematic diagram of the circuit
4. Simulation results
5. Description of circuit operation: Both theoretically and experimentally
6. Comments and conclusions
ATTENTION
Cheating is strongly forbidden and will be severely punished. Each project can be implemented
in many different ways. Hence, it will be easy to detect similarities. This does not mean that you
cannot collaborate with your friends. However, the allowed form of collaboration is exchanging
the ideas, not duplicating the design details.