FM Bug Transmitter Mint Box Circuit


Posted on Feb 5, 2014

Here is the circuit for the FM Bug. In total there are 18 core components that are needed for the fm transmitter to work properly. The far left side has the electret microphone and then things move electrically to the right until they hit the antenna. Don`t let this microphone fool you, it`s extremely sensitive albeit a bit clunky and big. You co


FM Bug Transmitter Mint Box Circuit
Click here to download the full size of the above Circuit.

uld shop around for a smaller microphone I`m sure but for this project, a standard electret microphone does the trick. The input is pulled high with a 22k resistor and passed to the amplifier circuit. The amplifier`s job in this circuit is to take the audio input and beef up the voltage/current so that when it gets transmitted it travels further. More amplification means more higher fm transmitting power and longer range. The last portion of the circuit with the 2nd BC547 is where the oscillator for the FM frequency is generated and mixed with the audio signal inorder to form the frequency modulation used for FM radio. Don`t worry, if all this is described a bit too quickly, the theory will be desribed more indepth in the next section.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Servo motor Tester with PIC12F675
Electronic combination lock
Wien bridge oscillator II
Time-Delay Photo-Flash Trigger
Radio Beacon Converter
Quiz Project
Light Dimmer Using Diac or transistor and triac and description
display and serial interfacing of
how to test servo servo tester simple
atmel isp
Speech amplifier circuit
Field Strength Meter
Manpower sensing alarm circuit



Top