The decoder PC boards arrived yesterday, and I now have two of them running. The following corrections must be made:

Omit C25 and C26 (22pF).

The 1uF capacitor on U2 (the 7805 regulator) was mislabeled on the schematic (duplicated “C4” reference designators), and consequentially was not included on the board. The cap should be soldered directly to U2. I’ll correct the reference designator to C5 on the schematic.

The node label “3D” was misplaced on the schematic at U20A pin 3, causing the connection to be ignored. A jumper must be soldered from U20A pin 3 to U21 pin 4. I’ll fix this on the schematic also.

J1 is shown incorrectly on the schematic. The outer shield should connect to ground, and the inner conductor to R1. Edit: This has been corrected on rev C and later of the schematic.