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Hello every one, in this instructable i will show you how to build a simple surveillence bug, other wise known as an Fm transmiter. its an extremly fun and entertaining project that you can do at home while learning about an essential tecnollogy that has become more and more frequent throughout the years.
i would like to appologise to all my viewers and followers for not posting any thing lately, I've been so busy that I haven't been able build any thing, so I'm hopeing that this will make up for that.
If you are new to electronics I will make this as simple as possible telling what every component does and is for and exactly where it goes. However that dosent mean that it will be easy, you will need some basic soldering skills as well as some knowledge on basic components.
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Here what you will need:
- An NPN 2n3904 transistor
- A 9volt battery clip
- Copper clad board
- (2x) 100 pf ceramic disc capacitor
- (2x) 0.01 uf ceramic disc capacitor
- A small micro phone
- Covered wire
- Un covered copper wire 18 gauge
- 10 uf capacitor
- And the following resistors- 470 ohm, 10k ohm, and 22 k ohm
- soldering iron
- 60/40 rosin core solder
- Wire cutters
- Fm radio recover
All these items can be purchased at your local radio shack or online.
In the first picture I have given you guys a scamatic to follow but it isn't needed to make this because I will be very descriptive.
Start by cutting your copper clad board. Cut out a ground plane that is 1.5 inches by 1 inch, then cut back rail along with the 4 other small pieces. In the picture I have marked each piece with a number. 1 is the back rail, 2 is 2, 3 is 3, 4 is 4, 5 is 5, and G is ground. I will tell you where to solder each component.
glue the pieces on as shone and let it dry.
I didn't take any pictures of the coil being made and I apologize for that, but all you need to do is wrap the 18 guage copper wire around a bolt several times, then you unscrew it from the bolt like interviewing a nut from a bolt. Then you will make small feet by bending the wire ends in the same direction. Once you have your coil made you will solder it to plate 1and 5 as seen in the picture.
now take a 0.01 uf ceramic disc capacitor and solder one wire to plate 5 and the other to ground as shone In the picture above.
next solder the 22 k ohm risistor to the plates 4 and 5 and cut off the extra wire so it's not in the way. Here's a tip if your having trouble with the soldering, pre tin or pre solder the connections. This will allow the two pieces to bond together better.
now you will need to add the 10 uF capacitor to the circuit. First look at your cap. It should have two wires, one of these wires will have a big white stripe pointing at it this is the negative wire and will be solders to plate 3. The other wire will be soldered to plate 4.
now for another resistor, the 10 k ohm to be exact. One end will go to ground and the other end will go on plate 4 as shone In the picture.
now we will add the other 0.01 uF ceramic disc capacitor. One wire will go on plate 4 and the other will go to ground, I found a nice little place on the edge of the ground plate for this.
now for the hard part adding the transistor, assuming that you made it this far tells me that your over qualified for this, however one little mistake will make it not work so pay close attention to these two steps where I explained how to add the transistor.
Start by soldering the the emitter or pin 1 to plate 2.
Next solder the base or pin 2 to plate 4, and solder the collector or pin 3 to plate 1.
next solder the 100 pF ceramic disc capacitor to 1 and 2
now we can add the final resistor, yayyyyy. Solder one end to plate 2 and solder the other end to ground.
next you will add the final capacitor. Take the other 100 pF ceramic disc capacitor and solder one wire to plate 1 and the other to ground.
here we will be adding the 9 volt battery connecter to the circuit. Solder the red wire or positive lead to plate 5. Solder the black wire or negative lead to ground.
DO NOT hook the battery up yet we are still not quite done, doing this could damage the circuit.
now you will add one of the most important parts, the microphone. Start by soldering the lighter colored wire to plate 3, then solder the darker colored wire to ground.
finally cut a foot long piece of rubber coated wire and solder it to plate 1, this is your antenna.
when your done it should look like this. To use it plug in the battery, get an fm radio and make a recognizable sound next to the transmitter. Search through the different channels until you find the sound, this is the frequency that your transmitter gives out. Now your ready to spy on anyone. Be sure to keep in mind though that it is illegal in some states or countries to use an Fm transmitter without a permit, be sure to check local laws in your are.