Qiyingtailun offline voice module controls the Bluetooth power amplifier switch and LED desk lamp to turn on and off (other functions are to be determined). The Bluetooth power amplifier part is used as a computer speaker. The audio part is divided into high and low sounds.
Bluetooth uses the off-the-shelf module M18 on TB , the power amplifier uses ST TDA7269A, TI LM1877, PTC PT2308, and the pre-amplifier frequency divider uses TI OPA1678.
The noise floor in the right channel is inexplicably loud, especially the right channel output of the LM1877. The left channel has no noise floor ( I can’t hear it anyway)
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