Here LED indicates the power supply presence. When the sound wave is picked up by the microphone then it’s converted into an electric audio signal and then the Q1 transistor modulates that signal with a carrier signal and finally transmits the FM signal through Antenna. L1 can be made from 0.5 mm enameled copper wire by making 6 to 7 turns in the diameter of a normal pencil. Now, these two components L1 and C2 act as a tank circuit and oscillate carrier signal for FM. The collector terminal of Q1 is connected between the L1 and C2 components, and the signal from a microphone is applied to the Q1 transistor Base. Here the emitter terminal of the Q1 transistor is connected to the positive bias and antenna element. A condenser microphone has the ability to pick up low-level sound waves. An FM transmitter is a low-power FM radio transmitter that broadcasts a signal wirelessly with a specific frequency to a standard FM radio or mobile device. Fm Radio Circuit Diagram, Make this Simple FM Radio Circuit Using a Single Transistor Circuit FREQUENTLY ASKED QUESTION What are the types of wiring diagram Schematic Diagrams. The transmitter can be placed in the desired room and the conversation heard from a place far away just using a regular FM radio set.Īs we can see in the circuit, first it takes an audio input signal from condenser mic MK1.
A soon as this occurs the transistor switches ON via the 47k resistor making the pulse by means of the inductor which draws back a negative pulse to the base of the. This small FM bug transmitter circuit can transmit audio signals for up to a few hundred meters. Why isnt my single Transistor FM Radio work My simulation with proteus shows signal at resonance. The following single transistor FM bug circuit might be known given below: When turned on, the capacitor 22n prevents the transistor from switching until it becomes charged. In this circuit, a single-stranded wire is being used as an antenna and a condenser mic is used to fetch the audio signal. This FM bug utilizes minimum power to transmit audio signals, unlike powerful FM (frequency modulation) transmitters. We can power this circuit by using a 9V battery or small voltage and package battery. We make a simple and small FM bug transmitter circuit designed by using a single transistor and a few oscillating elements, which can be constructed in small size PCB or general-purpose PCB. Due to the high sensitivity, even the ticking of the clock to hear. In this tutorial, we are going to make a “Small FM bug Transmitter Circuit”.Ī small FM transmitter Bug is perfect for transmitting and eavesdropping purposes.
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