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By Peter Giling

Reverse loop circuit

Functional description

Many railroaders have problems with reverse loops.
The majority in available units for this purpose are working with a short circuit detector
It does not need any explanation hat that would be rather destructive for your precious material.
This unit gives an ultimate solution in digital systems.
It uses the normal current detection for switching the loop into the right polarity.
It is NOT suitable for analog systems.
It is provided with several feed-back outputs to connect GCA50 (LocoNet) or CAN-GC2(CAN), for full compatibility with Rocrail.
Also in manual digital control, this unit will provide the correct switching for your reverse loop.
4 current detectors are on board to enable correct swap of rail power lines.
1 extra current detector is on board to get a rail occupied indication inside the loop.
Opto couplers are on board to separate rail power from Loconet.
Auto reset multifuses are on board to protect current sensors from overload in short circuit situation.
The standard 10 pin header connector is compatible with the 10-pin connector on GCA50 (LocoIO) and CAN-GC2 (CAN).

How it looks like

Schematics and Layout


This unit can also be used as a stand-alone for your layout.
Please consider it is NOT suitable for analog drivers.
Only digital systems can be used.
For stand alone, the unit needs 5V supply connected to J3. (max 30 mA)
All 5 feed-back points are also connected to J3 and can be used for external indication
The table below explains all connections.
Pin #1 is the closest to the R6.

Pin# function
1 +5Volt
2 0V ground
3 Feedback x
4 Feedback y
5 Feedback a
6 Feedback b
7 Feedback c
8 for test purpose only
9 Not connected
10 Not connected
mgv102-en.txt · Last modified: 2018/11/12 08:56 (external edit)