TMCC compatible conversions
Re-purposing Electric RR Co.'s Mini Commander with Custom Software.
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||The Triacs run very cool with the DC can motor. Two external diodes (1n4004) are used for the motor. One on each HC output. HC-1 is forward and the HC-2 is reverse. The antenna is just piece of solid wire (orange in the picture).|
The LC-1 an LC- 2 outputs are used for the headlight control.
This picture shows the 2-56 Triac mounting screw. The HC-2 connector is a close fit but it will clear the screw head.
|Here is how the insulator is mounted under the heatsink. The insulator is just a piece of cardboard cut to with a 1/8" hole punched in it and a fold at on end to prevent the heatsink from touching the frame if it is turned. One could use a piece of silicone heat sink rubber insulator if one has it. A 7/64" hole is drilled through the loco frame and countersunk on the bottom side. Remove the plastic fuel tank first.|
|The Mini straddles the motors drive coupling.|
The triac screw hole is drilled with a #52 drills and tapped 2-56 through both holes.
The heatsink base is drilled for a 6-32 tap.
|The Software used in this Mini is a custom written version.|
|Here is one of my American Models FM Trainmaster Engines with the Mini Commander conversion too. The red wire is the added external antenna|
|A little more room in the FM Trainmaster than the RS-3 but it still needs the small size of the Mini to do a TMCC conversion. I have a pair of these also that will run in a MU lashup|
|The American Model's Baldwin Switcher presented more of a challenge to fit in the limited space of the Baldwin's chassis. I made a slightly different heatsink mount for the mini in the Baldwin that I used on the RS2 and FM units. It is shorter and mounts at 90 degrees from the other version heat sinks.|
|The connectors on the end of the Mini were removed and the motor diodes were soldered directly on the board where the HC-1 and HC-2 connectors were. The other connections for power and headlight were also soldered directly to the board .|
|The red wire is the antenna. I removed the Mini's onboard antenna|
|This unit also has the low speed gearing offered by American Models. It really can crawl a drag through the yards.|