This assignment is based on student budget.

The circuits are consist of Transmitter and Receiver, those two circuits are transmitted by Infrared LED (Tx & Rx).
It would be a simulation of the circuits, and the components hardware in the breadboard.

Illustration:
Mono or Stereo jack is connected from the transmitter, and we must have a tuner (variable resistor in transmitter) to tuning the volume, then we can hear the sound from the transmitter respectively.

The Objectives:
*Able to hear the sound at the transmitter as well as the input music (with any modulation technique, AM is preferable)
*Adjust the tuner, as to be the volume control of the sound

Components:
We can use any types of components. Simple basic Amplifier is recommended.
No need Programmable IC or microcontroller Unit. Just use an IC or OP-AMP chips.

The components that available at the moment right now,
*Transistor NPN BC548 and PNP 558,
*Mono Speaker 8 Ohms,
*UM66 and LM 386 for music,
*OP-AMP 741,
*Diode Zener 3.2 V,
*3 pairs of LEDs Transmitter and Receiver,
*Male jack 3.5mm (due to connection cable from computer to hardware),
*Female stereo and mono for jack 3.5mm cable,
*Voltage regulator,
*Some Capacitors and Resistors,
*Battery 9V 2pcs,
*Variable Resistors 10k Ohm, 100k Ohm

References:

http://www.docstoc.com/docs/71374126/Wireless-Data-and-Voice-Communication-Through-Infrared-Led

http://forum.allaboutcircuits.com/showthread.php?t=3483

http://www.scribd.com/doc/12852897/IR-Music-Transmission-and-Reception-JNTU-Atp

Budget is not more than $40. And the complete period would be just 3 days, from the day it posted.
Submission Maximum at Monday April 4th.

Description of Works:

1) Simulation of schematic the current circuits for both transmitter and receiver, by using Multisim or Proteus.
This simulation may be successful in the process, but it must applied to the actual components until the project works.

2) Full explanations of the simulation part. (Ms. Word files and component datasheets)

For instance;
* What modulation technique do we use.
* Basic calculations or any equations that require in the simulations
* Why we use this type of amplifiers? (i.e. OP-AMP 741)
* What the purposes of these resistor of … Ohm, Capacitor or any IC in the circuit,
* If the transmitter use modulation, how the demodulation signal going through at receiver,
* If the sound it is not clear as the input, what happened to the signals?
* Why it come with noise at the receiver?
* And other explanations, regarding how the circuit works properly.

NOTE : The job is only the schematic simulations in the software ($25) and full explanations of why it works and operates, I would ask some questions if necessary ($15). Therefore I will construct the hardware in the breadboard myself.

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