ISD1820 audio playback recording module with speaker and microphone

The ISD1820 module allows audio recording and playback. By default, it offers 11 seconds of recording, but by soldering a R4 resistor to a 220 kΩ resistor, this time can be extended up to 20 seconds, although at the expense of sound quality. With keys on the board, it can operate independently or be controlled from a microcontroller. The built-in microphone allows audio recording without the need for an external source. Recordings are stored in memory even when the power is disconnected. The module allows the entire message to be played back when the "PLAYE" key is pressed. It is also possible to listen to the message as long as the "PLAYL" key is pressed, and by adjusting the jumper, it is also possible to play the message in a loop. Specification:

* supply voltage from 3V to 5V

* built-in microphone

* length of recording up to 11 seconds

* microcontroller controllable

* 8 Ohm speaker output

* built-in 0.5W amplifier

* dimensions 39mm x 42mm