Make your own FM Spy Bug!

Make your own FM Spy Bug!

Creating a Spy transmitter.

This is my first tutorial, so it might have errors.

Introduction to the transmitter.

In this tutorial, I will show you how to make a small inexpensive and easy to build spy transmitter that can have a 1/2 mile range!

First, you should know the basics of electronics, such as transistors, resistors, capacitors and Soldering!

Parts:

Q1+Q2= 2- 2N3804 NPN transistors (most NPN will work, but the 3904 is my favorite becaues the leads match the schematic)
Electret= 1- eletret mic
R1= 1- 20k-30k resistors
R3= 1- 10k resistors
R2= 1- 100k restistor
R4= 1- 4.7k resistor
C1,C2,C6= 2- 104 capacitors (0.1uf)
C5= 1- 10p (picofarad) capacitor
CC4= 1- 10p-50p capacitor
R5= 1- 100 resistor
1-9 volt battery clip
18" of cat5 (phone line) or similar wire 20AUG
1"x2" perfeorated board

Plenty of time.

Here is the Schematic for the Transmitter:



Once you have gathered all the parts, cut your perf bord into a 1" by 2" rectangle.
Then lay out the parts starting with the Mic, and Start soldering.
Make sure that the side of the mic that is connected with R1 has a small + symbol!

Making the coil

When you get to the coil, wrap 5-8 turns of 20AUG or simlar wire around any round thing that is 4-6mm. Such as a screwdriver. Scrape the insulation or enamel off the leads of the coil.
Here is a example from another website:

solder on the battery clip, and get ready to test!

Here is my finished transmitter:

Tune time!

Turn on a FM radio, set it 1 meter away, and tune it to a blank spot (no station) now, plug the battery to the clip, and use any small plastic screwdriver to move the coils appart starting at one end until you here a squeel. <That will tune the transmitter to a frequency on the FM band.

Great, you have tuned your Transmitter!
Ajust your radio to pick up the TX better, and place the transmitter near some sound(ticking clock, music..) move your radio as far as you can while still hearing the sound from the transmitter. Open fields are perfect for this.

Need help, Post and I will try to answer all your questions!

Have fun!

This is Only for educational porposes Only!
check your local laws reguarding using this type of device!