The SpaceHarp is a 4-stage phaser based on the early EHX Small Stone v1, utilizing 3 LM13700 OTA chips rather than out-of-production CA3094?s. Features include an internally-switchable jfet-buffered input, and trimmable lpb-1 boost on the output for crystal clean makeup volume.
The dimensions of this pcb are mm 75mm x 57mm. This pcb is included in the ready to solder kit:
This project is by Lectric-fx. As this is a quite complex circuit and as it requires some pre-setting this is more for the experienced builder!
Here is the direct link to the manual with layout and schematic: