440Hz GENERATOR

Original schematic: MODWIGGLER

SCHEMATIC

The original circuit was good enough to use, however I wanted comfortably aligned 10Vpp outputs. So I added a simple opamp circuit to get the outputs 10Vpp and aligned from 0v. You probably wonder why I used fixed resistors instead of trimmers to control output voltage. Because I decided to add the opamp circuit after having finished 555 timer circuit, so there were not much room. I would have used trimmers over the resistors to get more precise result if I build it from scratch. 

STRIPBOARD LAYOUT

All the trimmers are multi-turn trimmers.

FACEPLATE LAYOUT

The layout is actual size so you can use it as a drilling template.