3000 m circuit diagram of a wireless FM transmitter

Many FM transmitter circuits have been published here. This is just one after another, the first phase of the two transistor frequency modulation circuits is based on a pre-stage stage of the transistor Q1. This is a collected electrode current and R1 that provides the necessary collectors set to the base bias resistor R2 set by the current bias amplifier stage. C1 is an entered base input audio signal for input DC decoupling capacitor Q1. C8 is a power bypass capacitor. The next stage is around the transistor Q2 oscillator and modulation phase. Output electrolysis capacitor C2 couples to the second phase. Q2 bias resistors R3 and R4. R5 is the emitter resistance of Q2. The resonant circuit composed of inductance L1 and fine tuning capacitor C5 is necessary to create oscillations. The modulated frequency modulated signal is a collector of Q2, which uses a capacitor C9 coupling antenna. Circuit diagram. Simple FM transmitter circuit Precautions. This circuit can be powered from any 6 to 12V DC. Use battery powered circuits to improve performance and reduce noise. A 9V PP3 battery is a nice choice. If you are using battery elimination, it must be well filtered and regulative. Try C5 can be used to adjust the transmission frequency. The antenna can be a 1 meter copper wire. L1 can build a number of turns of 4 1 mm prior to a diameter of 10 mm. The maximum range obtained by the fine adjustable capacitor C6 can be adjusted. The components required for this circuit can be purchased from waste.

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