Train Detection, Circuitron DT4?

Dan

I have used several of the Circuitron DT4s with the Atlas/Custom Signals product and found them to work as advertised

Steve, are you a 2 rail guy? Using DC voltage?

I did get one DT4. It seemed like what I needed. I am a 3rail guy. The problem I seem to have is that the DT4 needs DC voltage. The Atlas/Custom signal boards I run on transformer AC. It seems the "ground" needs to be the same. So, I put in a bridge rectifier for the signal boards too. It seems that the transformer-track "ground " still being off the AC is somehow hindering the boards operating properly.  All the track and signal boards operate off the same transformer, (an old ZW).

I have thought about getting some diodes to put between the DT4 and the track detection wire so that the current can only go one way.

One DT4output is hooked in parallel with the next block detection wire.(That detection wire circuit is completed thru the two outside rails) The DT4 would only detect that train between the signals on a crossover. It should turn "Off" when the rear car clears the photocell, but the detection wire is still hot as the next block is active. That is why I think a diode would help. Maybe there is some feedback from that next blocks detection wire.

Still tinkering with it.

Dan    

Dan,

You can reach me at Atlas 908-687-0880 X 7142