[Photo] 9018 wireless microphone

The wireless microphone has reasonable circuit design, beautiful appearance, long sound transmission distance, long service life, economical benefit and low power consumption, and is suitable for ordinary FM FM radio.

The production of the oscillating coil L: it is finished after the flat winding 4T of Ф0.5mm enameled wire is used on the Ф5mm straight shank drill.

Adjustment of the oscillating coil L: Turn on the radio (placed in the FM section) and the microphone switch, then hold the microphone and adjust the knob of the station while speaking to the microphone until your voice is heard from the radio. If you still can't receive your voice in the entire frequency band (that is, 88 ~ 108MHz), carefully turn the oscillation coil L. When turning, you only need to pull apart or reduce the distance between each turn of the coil, and you should be careful when adjusting. If adjusting the tightness of the coil still has no effect, weld L down by one turn or reduce it by one turn (due to the influence of electronic component parameters), and then re-weld to continue the above adjustment.

Before preparing for installation and production, please use a multimeter to screen the quality of each component, and if possible, measure the capacitance of each ceramic capacitor, so that it is foolproof, and the installation is successful. The quality must be ensured during welding, and no false welding, false welding or wrong welding can occur.


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