Simple remote wireless frequency modulated microphone ----- Wireless Microphone

Simple remote wireless frequency modulated microphone, Wireless Microphone Keywords: simple remote wireless faster microphone Seeking a long time, high pick-up sensitivity, no running faster for a long time, and is easy to make, and low cost wireless microphones is a lot of enthusiasts. The single-tube remote wireless frequency modulated radio passenger is provided herein, that is, the above characteristics: Since the annular antenna L1 used as the oscillation coil, the antenna flows with the high frequency: current synchronous resonance with the oscillating cheeks, so it is always in the most Best launch state. It is practical, approximately 100-150 m from an empty emission distance (the receiving machine is the Tolyl781 pocket radio, the antenna is extended to the reception distance that can be achieved at 0.8 meters). In contrast, in the case of work voltage, operating current and emission frequency, L1 is replaced with a normal spiral coil, and the oscillating triode collector is connected to a trip antenna of a 5P capacitance to 0.8 m long, and the front and rear The emission distance of the emission mode is almost fairly, and the transmittance efficiency when the built-in ring antenna also as the oscillation coil is quite high. The internal ring antenna, a length of 160mm, a diameter of 1 mm enameled line, is formed into a metal ring or a square frame, embedded within the casing; adjust the capacitor C3, so that the transmit frequency is between 88-108MHz, in order to use the FM radio to accept . 'When the battery voltage varies between 1.2-2V, it works for a long time, the transmission frequency of this circuit is stable. Battery voltage is 1.5V, whole. Machine work - current is about 2.5 mA. When debugging, do not close to the ring antenna, do not close to the metal when placed, so as not to affect the oscillation frequency and the emission distance.

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