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This is the ‘other’ D-17-type EFIE I had mentioned as being sold on e-bay, and as I just learned, by the Hydrogen Garage. HG was kind enough to post a circuit schematic, so I wasted no time building one. Then I added in a 6-position rotary switch to adjust added voltage instead of the trimpots. The next one will get a relay instead of switches. Looks like it will work well! BTW the trace patter…