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and the test phenomenon is: the speaker plays the recording, and the playback
stops when the PLAYL button is released; and the PLAYL button is pressed again
the recording plays from the beginning.
G. Dial the FT dial switch to the ON terminal, you can hear the speaker sound, this
is the pass-through function; it is to talk to the microphone, get the test
phenomenon, and speak the microphone in real time through the speaker.
Special Attention
Referring to the schematic diagram, the P2 jumper cap on the module is
connected to the POSC end of the chip. We can change the recording and
playback time by adjusting the connection resistance of the POSC terminal
(default 100KΩ). The shorter the recording and playback time, the better the
sound quality, the longer the time, the worse the sound quality.
The table below represents the recording and playback time corresponding to the
POSC terminal connection resistance.
ROSC/KΩ Recording-play time / S
80
100
120
frequency/KHz
8
10
12
Sampling
8.0
6.4
5.3
Typical
broadband/KHz
3.4
2.6
2.3
4
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