The newest DAC20 have a 4 pin power connector, SK1. Its connections are as follows:

  • Pins1,2: DCC track
  • pin 3: +ve aux input
  • pin 4: Ground

The aux supply, if you need one, should be connected between pins 3 and 4 of the power connector SK1. If is it s DC supply, connect the positive connection to pin 3; if is is AC, then the polarity doesn't matter.

The manual also refers to SK3 pin 1 for ground. This is correct, but it is no longer necessary to use that different connector.