Always Remember To Never Forget

The ISD1820 voice recording IC has gained some popularity recently and has popped up in a few other cool projects and guitar effects. This one is pretty simple compared to those. It's a lofi sampler/looper essentially. Signal is split at the input via the 2N5457s and half of that is fed into the recording IC, while the other half remains clean(this allows your signal to be heard while in 'record mode'). There are three separate methods of playback: momentary, latching, or looping. Depending on where the sample rate is set at you get 8-20 seconds of recording time. Once a sample is recorded it's playback speed can be altered for some really cool and unique sounds. Special thanks and credit is due to BASTL and WRAA whose experiments with these voice chips is where my projects all stemmed from.

Flooper

My first entrance into the world of ISD1820 answering machine ICs. They're designed for voice recording but depending on how its used/abused you can get some cool guitar effects. This is an interesting design I found on the DIY forums. A fuzz, a looper w/ speed/pitch controls, a lofi effect, a really loud boost. It's not the best looper out there but it is one you can build yourself.