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The most important thing is that
The TIP120 Darlington transistor is actually a dual-transistor configuration made by two bipolar transistors connected in such a way that the current amplified by the first transistor is amplified further by the second one
voltage regulator
this HAT does not come with a 12mm coin battery
Adafruit Electret Microphone Amplifier MAX4466 - Adjustable Gain 70097 The most important thing isElectret Microphone Amplifier Breakout MAX4466 with Adjustable Gain The Adafruit MAX4466 Electret Microphone Amplifier is a compact breakout that pairs an electret mic capsule with a low noise op amp for a clean, amplified analog audio signal you can read with any ADC. A small trimmer pot lets you set the gain from 25x to 125x, making it easy to tune sensitivity for your specific application. Technical specifications Chip MAX4466 (Maxim) Microphone
