PSU

Think the logical starting point is the power supply. This will be needed for testing and debugging all other boards, so started it is! Just ordered the transformer, similar to the one pictured above; fan will be a standard PC cooling fan, much quieter both accusticaly and electrically than the original fan. I am rethinking my idea of making the trimpots accessible from the back of the instrument; power supply calibration should not be something that is required frequently, so I may rotate the trimpots from their current position to make them accessible from the inside of the instrument only.