The circuit was laid out with Corel Draw. Only one copy of the circuit board was needed unlike the multiple identical boards for the under-cabinet lights. Instead of using photo-sensitive board material, a different method was used here. The artwork was printed onto a special Mylar sheet which was coated with a layer of etchant resist. This sheet was then placed onto the copper foil and heated with a clothes iron. Wherever there was toner, the toner plus the resist fused themselves to the copper. After quenching the board in cold water, the Mylar sheet was pulled off, leaving the pattern behind and the board was ready to be etched in Ferric Chloride.
The board was then stuffed with the components and mounted into a plastic utility box as shown below.