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#6364
wilkie1
Moderator

1.  To NOT use the A/B mod, simply install your D1-D4 diodes directly on the board.

2.  To use the A/B mod, you need to add an external DPDT switch.  This switch is best used with one of Barry’s DPDT wiring boards (temporarily out of stock).  The switch is wired to the A and B pads and different diode pairs are wired on either side of the DPDT switch.  A useful photo will be available when these switch boards are back in stock.  When using this mod, you do not install any diodes on the main board in positions D1-D4.

The extra solder points that you mention are there to facilitate installing either a LED or a axial diode depending on the component’s lead spacing.  You would only use 2 of the three in each position.