This module is MFOS Echofxxx.
Original schematic and BOM: MFOS
STRIPBOARD LAYOUT
-D1 & D2 = 1N5231
-D3 & D4 = 1N914 or 1N4148
-100nF, Decoupling capacitors are soldered underneath the boards, so I omitted them in the layout
FACEPLATE LAYOUT
The dimension is 40mm x 129mm.
The layout is actual size so you can use is as a drilling template
-Pot hole: 7mm
-3.5mm jack hole: 6mm
-Screw hole: 3mm
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