• Construction is not especially critical. I chose a metal project box so it looks good on the bench.
  • The resistor values on the schematic are ideal values based on the 6V, 12V, and 24V outputs from the transformer.
  • The actual resistor values in the parts list are what I used based on what was on hand, and are close enough for my needs.
  • The circuit ground is not tied to earth. I found that the curve tracer performed better left floating.