John, getting ready to wire 21 Ross Ready switches (non-derail). I have 2 power sources, one AC and one DC. The Lionel is an AC 1.8 amp variable transformer, PN 6-32923. The other is a Wanptek DC switching power supply, model KPS305D. It has 0-30 V, 0-5 A. Which is the preferred power source to use and how does the power source connect to all 21 switches ? What volt and amp settings are best ?