Before attempting to build a DIY loop pedal I would suggest trying the following first.
1. Find an old vinyl record, the older the better
2. Give old vinyl record a good rub with 80 grit sandpaper
3. Obtain the oldest shittiest gramophone you can possibly find and replace stylus with a six inch nail.
4. Play old vinyl record on shitty old gramophone.
Then, and only then, will you have an idea of how lo-fi these loopers actually are.
If it wasn't for this website I would definitely have a life.