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Below is a link to detection curcuits this guy has used. Might give some ideas.
I bought his dcc ampmeter curcuits which work as advertised.
On Monday, June 27, 2016, 9:57 PM, lehighman@... [WiringForDCC] wrote:
I am building a new layout using DCC and want to install
signals. I understand that this requires
I set up a detection block(s) for each signal.
Blocks are also set up to distribute power throughout the layout or to
add reversing sections. My question involves my confusion regarding how each of
these blocks fits together. I isolate power
blocks by cutting each rail going into and out of the block – a total of 4 cuts
per block. I feed power to the block
through feeder wires connected to both rails about every 3 feet. What cuts do I make to set up a detection
block? As best I can tell, I only need to isolate one rail for each detection
block with a cut on either end and run the power lead to that rail thru the
detection circuit with the other rail being powered by the normal track feeder. Is this correct? I also need to determine the
location and length of each detection block – is there a good reference to read
to help me there?