Micro Transmitter Bug


Posted on Feb 5, 2014

Presented FM transmitter bug is built using BF414 / BF324 / BF606 transistor. The 30cm antenna has a range of about 30m in the building, more in the open field. Power supply 2x AAA batteries have been used with voltage of 2.75 V. I added resistor 10K in parallel with 1.5pF capacitor so that the system works well when connected to an external source (mp3 player / computer). On the computer I had to reduce sound to about 35% of capacity, so that I do not have clipping. I managed to improve transmitter stability with simple shielding. The coil is 5 turns of enameled copper wire wound on 1 mm ? = 5 mm


Micro Transmitter Bug
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    RF wireless allarm magnetic switch PIC16F84
    Automatic plant waterer
    Noise generator
    Communication between a USB/serial device and an AVR (atmega/Arduino) microcontroller
    burning hex files using usbasp
    Combinatorial and Sequential Circuits
    Solid State Tesla Coil/High Voltage Generator Circuit
    Adding sync pulses to the video signal



    Top