06-30-2013, 05:50 AM
With DC we could protect a stub terminal by cutiing a rail and wiring in a diode to halt a loco but allow it to reverse out automatically.
As DCC runs on AC a diode would not control such a circuit. Has anyone any ideas on circuitry to achieve the same protection . I want to arrange a shelf layout fo DCC and can see some potentially loco fatal situations for stub ends ( inattention, distraction, unexpected acceleration or merely using speed control in the wrong direction).
My irst thought was to use a block control switch to isolate the last section, and reset it to closed to reverse the loco out, but this seems a bit too crude operationally.
A second thought is to use an LDR to bias a transistor to control a NC relay. An RC circuit could slowly repower the relay to restore power to the stub section, giving time for the operator to reset the DCC controller to where it is wanted.
If any one hs any ideas or circuits to achieve protection, I would love to hear them.
As DCC runs on AC a diode would not control such a circuit. Has anyone any ideas on circuitry to achieve the same protection . I want to arrange a shelf layout fo DCC and can see some potentially loco fatal situations for stub ends ( inattention, distraction, unexpected acceleration or merely using speed control in the wrong direction).
My irst thought was to use a block control switch to isolate the last section, and reset it to closed to reverse the loco out, but this seems a bit too crude operationally.
A second thought is to use an LDR to bias a transistor to control a NC relay. An RC circuit could slowly repower the relay to restore power to the stub section, giving time for the operator to reset the DCC controller to where it is wanted.
If any one hs any ideas or circuits to achieve protection, I would love to hear them.