Input Devices

For my final project I want to record and store sounds to then use in various ways. I decided to use ISD1820s, which can record up to 20 seconds and playback the audio, but have a very lofi sound. Because of this I wanted to it to record through an AUX cable instead of a microphone because I felt that the low quality playback combined with a microphone could end up with indescernable audio, while recording through a cable would give me more consistent quality. Also, this makes more sense because I am more interested in sampling music rather than my voice or other sounds (although it's still possible to do this by connecting the phone to the recorder and using something like garageband that can record your voice).
Because the ISD1820 takes in analog audio, it was pretty straightforward hooking up a 3.5mm jack to some resistors and capacitors and then wiring that straight to the MIC+ pin on the ISD1820. I also forked off the input sound to go straight to the output stage so that I can hear what the input sounds like before recording anything.

A prototype board I made for taking in audio. It also includes a pot for volume control because if the volume from the device is too high the ISD1820 will clip it a lot and it will sound very distorted.

I also tried doing a board with the MEMS mic and an AT1614, but had trouble programming it.