User Tools

Site Tools


GCA124 LocoNet Throttle


By Peter Giling

The MGV124

The outside ……

…..and the interior


This hand held throttle is very well supported in Rocrail.

The Hardware

The schematic mgv124-sch.pdf
The PCB design mgv124-pcb.pdf

Questions ? ask Peter

The firmware

For the fimware, I have to refer to the original FREDI site.

Assembling instructions

A few remarks have to be made to help you being succesfull with the production of this FredI.

Fix the empty PCB with screws in it's future housing, and use it to drill the exact positions of the pushbuttons, SW2 and leds.

Use the pcb as a mould for holes of pushbuttons, leds and SW2.

All other parts can be mounted after that.

The pushbuttons and leds are mounted at the backside of the PCB.

Please take care not to use the center hole of the leds, because that one is only a drilling mould.

After a serious check, connect the pcb , without IC1, to LocoNet. Check if 3,3 volt is correct between pt 7 and 8 in IC1 socket.

As far as my experience has gone, R11 can be omitted.

Should you have any misfunctioning, the resistor might help.

Then refer to installation instructions at

mgv124-en.txt · Last modified: 2018/11/26 02:53 by rainerk