Built up the output amplifier with the output BNC and amplitude control. Hooked up with some crock clips and is working correctly. Next step is to build up the R-2R ladder, MCU and complete the power rails. With those items done the generator will be in an alpha state.

There are still improvements to be made to the software and I'm thinking of using +-9V (or higher) to give more headroom for the op amps to operate without clipping. This will require a second power rail for the MCU.

A new power supply board is likely on the cards anyway to allow for more power rails.