Simple wireless microphone circuit diagram (seven wireless microphone circuit diagram)

Simple Wireless Microphone Circuit Diagram (1) The radio microphone coil L1 turns is close to the change and the capacitance of the change in capacity is lowered, and the transmit frequency is lowered; the transmit frequency is high, it is necessary to take the opposite measures. The range of capacitance variations in parallel with L1 cannot be too large and too small, otherwise the transmit frequency will be illegible, and there is no high frequency transmit signal (the circuit does not vain). If you want a farther transmission distance, add a better antenna to the radio and wireless microphone, and appropriately raise the power supply voltage of the wireless microphone. The L2 of the simple wireless microphone is short-circuited; adjusting the L2 of the enhanced wireless microphone, L3 can make the distance farthest. The choice of higher sensitivity, and the selective high-end radio can be received more far. Frequency: 88MHz to 108MHz distance range: 20 to 50 m (1V --- 15V) Power supply enhanced schematic: frequency: 88MHz to 108MHz distance range: 100 to 300 m (1V --- 15V) Power supply simple wireless microphone circuit diagram (2) Frequency: 88MHz to 108MHz Distance range: 20 to 30 meters 3V power supply. This circuit (see Figure) adopts a capacitance feedback oscillator with a frequency stable and adjustable. Its feedback signal is in the form of a capacitive partial pressure, and the output signal of the oscillator tube is fed back to the input. Where RE is a DC negative feedback resistor, C3 is a diakor coupling capacitor, and CE is an emitter bypass capacitor. L, C1, C2, C constitute a resonant loop. Since C2 corresponds to between the base and the emitter of the transistor BG, the feedback signal is taken from the feedback circuit of the C1, C2, and the feedback signal is taken from the voltage on C2. The oscillation frequency of the circuit is f = 1 / 2π, where C = C1C2 / C1 + C2. Making Reviews The FM microphone is simple and easy to make, more suitable for beginners. In an open area, the emission distance of this circuit is 20 to 30 meters. Long-term operating frequencies have a large offset. The signal is more harmonic, and the neighboring is generated. When making, the MIC is preferably not taken out with a soft wire, but welcoming it on the board. The inductance L can take a high frequency wax after adjusting the φ0.3mm round rod. When it is judged whether or not the circuit is encapsulated, the following is available. Use a common pointer universal table AC2V block, either the table pen is floating, another table brush contact the antenna, if the pointer is found to swing, the circuit has been oscillated, which can be adjusted. Simple wireless microphone circuit diagram (3) frequency: 70MHz to 120MHz Distance range: 20 to 30 meters 9V power supply simple wireless microphone circuit diagram (4) frequency: 88MHz to 108MHz distance range: 100 to 200 meters 3V power supply

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