General > General Discussion
Dual Switch Single Track Wiring
TwinStar:
--- Quote from: Alan on January 09, 2019, 07:52:24 PM ---https://www.ebay.com/itm/DC12V-Switch-Control-Relay-Bistable-Trigger-action-Circuit-Module/262613032443?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D20131003132420%26meid%3Df5d9faaa1128461eaddf756a697af117%26pid%3D100005%26rk%3D1%26rkt%3D5%26sd%3D132703163629%26itm%3D262613032443&_trksid=p2047675.c100005.m1851
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Is this the entirety of what I need save for wire and switches? I'd assume a 12V+/- input for power, multiple wire pairs from each switch, and then a singe or dual in/out for one or both track feeders?
Alan:
--- Quote from: TwinStar on January 13, 2019, 12:23:33 PM ---Is this the entirety of what I need save for wire and switches? I'd assume a 12V+/- input for power, multiple wire pairs from each switch, and then a singe or dual in/out for one or both track feeders?
--- End quote ---
Yep. You have it all correct. China just made life real easy for you.
TwinStar:
--- Quote from: Alan on January 13, 2019, 12:34:35 PM ---
--- Quote from: TwinStar on January 13, 2019, 12:23:33 PM ---Is this the entirety of what I need save for wire and switches? I'd assume a 12V+/- input for power, multiple wire pairs from each switch, and then a singe or dual in/out for one or both track feeders?
--- End quote ---
Yep. You have it all correct. China just made life real easy for you.
--- End quote ---
Awesome. Now more stupid questions if I may.
Will these open/close the circuit on both rails or just one?
I assume I need momentary style switches? SPST?
I also assume an LED wired in parallel with the track circuit would indicate track status?
Thanks so much.
Alan:
The relay supplied on the board is SPDT so it will switch on/off only one rail. You would need a DPST or DPDT relay to switch both rails. Why do you need to switch both rails? An open circuit is an open circuit regardless of how many opens there are in it.
Yes, momentary contact switches. SPST
Yes, LED wired in parallel with track. Don't forget the current limiting resistor. If the track will ever see DCC power then you should also wire a regular diode in series with the LED to prevent damaging the LED when the DCC power is on the negative pulses. A regular diode will add an additional 0.7V drop so remember to include in your limiting resistor calculation.
TwinStar:
--- Quote from: Alan on January 13, 2019, 02:36:06 PM ---The relay supplied on the board is SPDT so it will switch on/off only one rail. You would need a DPST or DPDT relay to switch both rails. Why do you need to switch both rails? An open circuit is an open circuit regardless of how many opens there are in it.
Yes, momentary contact switches. SPST
Yes, LED wired in parallel with track. Don't forget the current limiting resistor. If the track will ever see DCC power then you should also wire a regular diode in series with the LED to prevent damaging the LED when the DCC power is on the negative pulses. A regular diode will add an additional 0.7V drop so remember to include in your limiting resistor calculation.
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Alan, I was planning on only opening one rail to cut power but I thought someone had posted a need to open both. Thanks for affirming my original plan.
I'll get on Digikey and find some cool ones.
It will see both DCC and DC. I'm sure I'll be back confirming my resistor calculation!
Thanks again, I really appreciate the info.
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