MRServo is a low-cost, low-profile, slow motion model railroad switch machine featuring PowerFrog technology. Using inexpensive and small RC servos, MRServo provides a cost-effective way to add slow-motion turnouts to your layout. PowerFrog technology provides a reliable, short-proof way to route power to solid frog turnouts. (Examples: handlaid, Peco Electrofrog™, Shinohara™, and Walthers™ models.) These turnouts will create a short if the points make contact with the opposing rail before the contacts driving the frog switch polarity. Traditionally, the solution has been to add additional gaps in the point rails, isolating just the frog. With PowerFrog, this is no longer necessary. When MRServo starts to throw the points, it momentarily isolates the frog. Once the servo completes throwing the points, it sets the direction relay to the correct polarity and, after a small delay, re-energizes the frog.
MRServo is available in three versions, to meet different needs and price points.
Each kit comes complete with the fully assembled control board, servo, hardware, throw wires, and a piece of heavy-duty mounting tape. A controller-only version is available if you want to provide your own servo and hardware.
With a little extra circuitry, MRServo can be made compatible with most Digital Command Control (DCC) stationary switch machine decoders. See details at "MRServo for DCC".
1.7"(L) x 1.2"(W) x 0.9"(H)
Need a slower or longer throw than the conventional MRServo design offers? We are able to customize the MRServo software to some extent and can provide custom-programmed units for a small fee. Email us and let us know your requirements, and we will be in touch about what we can do.
The latest MRServo hardware design files and source code are now available at GitHub!
Typical Quiescent Current @ VDD=12V, servo not moving:
50mA (CNTL = GND)
92mA (CNTL = 12V or Floating)