Sound recording module based on ISD1820. It has a built-in microphone and a speaker attached. Built-in functions allow you to record and playback audio for up to 20 seconds. The device does not have nonvolatile memory. Supply voltage ranging from 3 V to 5 V.
PHAT Speaker is a shield for the Raspberry Pi mounted directly on the GPIO connectors of minicomputer. The module has an I2S DAC and monophonic amplifier 3 W and 10-bar indicator. The kit also includes a small speaker of 8 Ω 2 W.
Miniature pressure speaker that converts any flat surface into a sound source. Does not need air for raising the voice. It can be applied directly to the head and not heard by anyone else. Power is 1 W, and the dimensions are 21.5 x 14 mm.
The module is based on the single-wire 8002 amplifier with digital interface. It can work as a simple buzzer or play music. The volume is adjustable with built in potentiometer. The supply voltage ranges from 2 V to 5.5 V.