Re: Automated 'Block' Entry

Jan Boen


This article goes (to) deep into detail.
For your model rail road it should be enough to e.g. understand that in a typical 2-rail digital system a block detection circuit comes in 2 basic flavors:
1- A diode circuit that allows detecting current consumption by a loco or car which results in a certain voltage drop.
This type is very commonly found in the market and has the advantage it will also work with (analogue) DC systems but has the disadvantage of having a voltage drop which may result in loco's running slower or more current being used to compensate for the voltage drop to keep the loco running at the same speed.
2- A Current Transformer (CT-coil) based solution which does not introduce a voltage drop but is somewhat more expensive because it comes with CT-coils and it only works for digital systems
How both systems work internally is less important.
In both cases you need electrically separated blocks and in one of the feeding wires you have to insert the block detection. So it goes in series with the tracks.

Read a bit about voltage, current and resistance and familiarize yourself with series and parallel circuits at a very basic level and understand that a typical DCC (i.e. digital) systems uses alternating (i.e. positive and negative) current/voltage to operate as opposed to classical analogue systems which typically use DC (direct current/voltage).

This web site makes good reading

Good luck,


On 25/08/2017 23:39, railandsail railandsail@... [WiringForDCC] wrote:
This appears to be an interesting article, and well presented.
But its over my head, not being electrically inclined



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