Fm Transmitter Bug Views

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Take a look at this fm spy transmitter which can be used as a bug transmitter or as diy fm bug too. It uses a single IC 74F13, one coil, a capacitor, one trimmer, one resistor and ofcourse one electret mic. This spy bug is so easy to build and can give you a total coverage range of about 3 to 5 meters. You may want to use a small 100mW amplifier to give a little extend transmission range so you can spy from other location. PHP Freelancer Please use only 74F13 because 74S13 and the other ones does not work in 88-108MHz range. As antenna you can use a copper wire (=1mm diameter) and as power supply 4 x1.2 / min.1200mA acumulators which will work for at least 7 days. Use short terminal for components and a good pcb.

Secret agents in movies often listen in on conversations with hidden microphones. You can make your own spy bug that will transmit audio through a FM transmitter. The procedure requires a few parts from an electronic supply store and a fair amount of experience in using a soldering iron on small electronic parts. You will be able to pick up what is being said from your spy bug using a regular FM radio from quite a distance away.

Many thanks to talkingelectronics.In this video we are showing you how to makea FM transmitter Bug using 2 transistors and with a transmission rangeof 800 meters !!This FM transmitter Bug is very easy to build.The size of the circuit board is ONLY 21mm x 15mm.I design the circuit board layout usingPain shop pro X2 ,it takes me 2 hours to getthe design right ,i want a very small PCB.To make the PCB i will be using the toner transfermethod and Ferric Chloride.Parts used:Home made PCB ,21mm X 15mmBC547 transistors x 21nf ceramic capacitor10pf ceramic capacitor33pf ceramic capacitor22nf axial ceramic capacitor x 21 - 5p to 30p air trimmer470R resistor10K resistor47K resistor68K resistor1M resistor10mm Mic175cm antennaBattery PlugSome solder19mm heatshrink