EHX Small Clone

Modded to include a depth pot instead of the switch used in the original, giving you variable depth control rather than just two preset levels.  Not the best looking layout with too many links and cuts, but it's a means to an end, and it's hard to avoid when you have 4 ICs, 3 transistors and lots of interconnections, so I'm just happy that I managed to keep the size down.  21 x 28 will be a squeeze to get in a 1590B, but with only two pots and no other switches it shouldn't be a problem for most people.

I didn't have enough room to fit in pulldown resistors on the input and output and can't bring myself to add extra columns just to do that, so if you get any popping just add them to the stomp switch, 1M between input board wire lug and ground lug, and 100K between output board wire lug and ground lug. I may actually do it with surface mount resistors on the copper side of the board (the entire second row is ground).

Anyway, you all know what it is so no need to describe further.  Manufacturers info about the great sounding, and very well priced original.

The classic chorus! Analog chorus pedal popularized by Kurt Cobain. The finest analog chorus sounds: from clear, rich and dimensional to warm pulsating warbles, can be intensified with the Depth Control. Simple tweaks generate exciting doubling effects. Chiming 12-string tone, or Leslie-like warbles.