How can I amplify the sim800l adduct output? Well, I’ve had noise problems, and also how can I reduce the noise in the microphone input signal?
Amplify sim800l audio output signal and attenuate sim800l microphone noise
Add a amplifier for increasing audio output and add a filter for reducing MIC signal. Check the hardware design guide, there must be some reference circuits or use generic filters and audio amplifers based on your wattage needed.