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Power Supply for Atlas Snap Relays and Turnouts
Jim asks:
“I am rewiring my HO layout and I have a switch to allow DC OR DCC running. I want to use separate power supplies to track LED signals and also for Atlas switch machines. I am having trouble figuring out what specs my power supplies (eg old phone chargers) should be. What voltage, current, and wattage? Thanks for any suggestions.”
3 Responses to Power Supply for Atlas Snap Relays and Turnouts
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Solenoid type switch machines like atlas require a substantial inrush current particularly when your actuating 2 or more at the same time. . It is best to use a capacitance discharge power supply. They can be purchased and/or built. there is plenty of internet information on them.
Hi Jim:
Just read your inquire about separate power supplies. I took a old computer power supply from a Dell computer and bundled together the colored wires. This gave me the voltage needed for signaling and lights. I have listed below the combinations used. Doesn’t matter if you combine three reds together, you still only get 5v. Hope this helps you or anyone else.
Green & Black turns on P/C
Black = Ground
Red = 5 V
Yellow = 12 V
Orange = 3.3 V
Blue = -12 V
Red & Blue = 17 V
Blue & Yellow = 14 V
Ralph
Thx Steve and Ralph. ( Now I have more homework to do).