How to make a wireless microphone

Some time ago, I turned a post about high-precision wireless microphones, and I deliberately took the time to make it for your study and reference. (Let everyone wait a long time, please forgive me if you don’t do well)

Original required:

Place the components in the lower position (front side):

Negative:

Welding looks good (the welder is very scum, just laughed)

Powered by 4 AA batteries

The potentiometer is not welded on the board, adjust the potentiometer to make the output signal strength of pin (7) moderate (see the circuit diagram for details)

overall:

The working frequency is within the range of 88~108MHZ, which can be received by radio. (After completion, you need to be patient when modulating the frequency) The transistor used in this example is NPN 9018. Tests have proved that the circuit is relatively stable, and there is no obvious frequency running phenomenon. The mobile phone is placed next to the electret microphone to play songs, and the frequency has not shifted after a period of time. Close the door of the room, take the radio through a few partition walls and still receive it without much attenuation. The sensitivity is better. Of course, it can't be compared with professional ones, it's okay to play amateurs. As for the working principle of the circuit, there is a detailed description in the radio basic information area!

The following is the circuit diagram:

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