I’m tinkering around with an audio project consisting of an Arduino Pro Mini (5v version), a DFPlayer MP3 Module, a TDA2822M Amplifier Module, and some 8 ohm 1 watt speakers.
The amplifier module requires 4.5-9 volts DC. I’m thinking of using a 9v battery to give the audio a boost. To prevent battery drainage when no audio is playing, I would like to power the amplifier only when audio is playing; the audio will play infrequently. Originally, I was considering a solid state relay module to avoid introducing noise into the circuit, but the options I have found so far are designed for AC loads.
Can I use a MOSFET to reliably control 9v power to the amplifier?
From what I have read so far, it appears that a MOSFET doesn’t latch. Can one combine a MOSFET with another component to create a latching circuit?
Or, is there a different component more suited to this task that would work similarly to a latching relay?