November/December 2018
Is there a device that will continuously "listen" to audio (via a mic or an earphone jack) and allow the user to push a button so that the device will repeat the last 20 seconds of what it just heard? I listen to scanners and ham radios, and often miss what was just said, and would like to get a repeat for clarity. I prefer a stand-alone device to an app or computer software.
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A company by the name of Nuvoton makes a chip that records sound — voice if microphone connected — which can then be played back with the push of a button. The chip is ISD 1964 for 64 secs of recording in various lengths of time segments. This is a surface mount 28 pin SOIC package and can be soldered nicely with a fine tipped soldering iron. You can find the data sheets on Digikey.com. I also recommend Onstate Technologies (OnstateTech.com).
They make a good quality circuit board for the sound chip and has room for most of the needed other components (thru-hole) including a version with an audio power amplifier chip to drive a decent speaker. I believe that the chip can be operated directly from a few push buttons. (Record, stop, playback). It can also interface with a microcontroller.
