Echo Chamber Schematic

The following diagram is the schematic diagram of echo chamber circuit which will convert the sound of input to have echo sound like repeating sound if you talking in a cave. It will smoothing your sound also.

The circuit based 4 main ICs that are a MN3005, a MN3101, and 4 pieces of AN6551. I've made this kind of circuit, it's working great and you don't have to spend a lot of cost. :)