MINI FM TRANSMITTER Rs.100/-

**FM TRANSMITTER**

PROJECT BY:

M.FAIZAN MAZHAR
BS.c (EE)
APCOMS
*********
20th FEB 2016
at   3:00 pm
SATURDAY

VIDEO:

PROJECT:

In this project i made a FM transmitter which takes sound waves through Condenser mike and transmits
radio signals. Transmission of this FM transmitter can be received through any mobile or ordinary FM
receiver.It has a range of 1/4 of a mile . Frequency can be adjusted with variable capacitor using screw gauge.

COMPONENTS:

Resistors:
1 M ohm
100k ohm
10k ohm (3x)
1k ohm
100 ohm

Capacitors:
**All caps are ceramic disc
40 pF or any avaiable variable capacitor
100 nF (2x)
4 pF

Transistors:
2N3904 NPN (2x)

AVAILABILITY:

All components,PCB, Ferric Chloride & Butter paper are available at D.A.V College Road
Rawalpindi at:::Saeed Brothers , Hafiz electronics , Allied Electronics & IC master.

CIRCUIT DIAGRAM:

PROCEDURE:

Download pdf layout files from this Blog and print at 100% scale with laserjet printer , Do not use inkjet printer. Print on Butter paper.Butter paper is special glossy paper for printing PCB prints. Cut pcb with Fine Saw blade according to size of layout then press it with hot iron for 1 minute, then put it in warm water and remove paper by messaging.Now put PCB in Ferric Chloride Solution

FERRIC CHLORIDE RECIPE:

To make ferric chloride solution fill a  Bottle with 1 Liter of  tap water nor hot nor cold. Put 50 grams( Buy it from saeed brothers in Shaheen market D.A.V College road) of Ferric chloride powder in bottle slowly & close the lid and Shake it slowly , Do not use it , First keep the solution for about 2-3 hours then use it as required . You can do many Etchings using this solution . Please save your clothes and floor from ferric chloride it changes color of Marble even. Not too dangerous but save your hands .

After Putting PCB in Ferric chloride Solution ,Shake it little bit again and again , it will take about 1 hour in etching process.Now wash pcb with water and use nail polish remover to remove ink , Now drill holes with mini drill .Now place top silk layout on PCB top and iron it and put in water and remove the paper by messaging again.Now place the components.Inductor::::

INDUCTOR:

I made inductor by wounding a single connector wire on old rusty bolt . I tested many inductors but this worked perfect.

Just wind 7-8 turns on bolt and remove it and your inductor is ready.Place it on PCB .Microphone has polarity its one point is short with body & is the negative of MIC ,connect it with ground or negative.

The variable capacitors which i bought were short so i used two 5 pF caps in parallel to get 10 pF capacitance and it was giving me channel at 101.8 MHz .when using variable place mobile with FM running in loud speaker and rotate  variable with screw driver , i will recommend to use plastic screw gauge .when FM speaker make noise stop that is the station at which FM transmitter is Transmitting Radio signal.

ANTENNA:

I used a small 3-4 inch single connector wire u can use any small piece of wire.

DOWNLOADS:

Click to *DOWNLOAD*
Package Includes:
1) Top & Bottom Layouts
2) Proteus Software 8.3 Files
 Kindly print at the scale of 100% in Adobe Reader.

NOTE:

Kindly Do not Use it for Spying or any other Negative Purpose . If you find any Thing missing or stuck
then leave your Comment in ASK ME tab or Proceed to CONTACT US.
 Thanks for visiting Our Blog. Wish u Best of Luck. :)