[GVT] Small transmitter & RC-conversion

Posted by Gerd on Wednesday, 20 January 2021

Hello,

first I used my existing Deltang transmitters from my garden railroad trains to control the tiny 009 locos. But soon I had the idea to make a small handheld transmitter especially for the small locos. Since I couldn’t find a small housing, I made my own from beech wood. Both blocks were milled to sice and hollowed out to take the components.

Beside a Deltang Tx2-transmitter, you’ll need some switches, LDE and resistors, together with a throttle pot. I installed a small 300mAh Lipo battery for power and as there was enough space, I also included the charging-module inside. To make the control LEDs of the charging module visible, I added small window in the backside. Circuits, how to wire the Tx2 are shown on the Deltang.co.uk website.

After final testing, all components were stuffed into the housing and I added printed lable on top.

To operate two trains the same time with the new transmitter, I addapted the Selects-function. Instead of the regular 12-channel-switch, I added a regular switch for only two locos. I simply summed the resistors to simulate all the other channels. My transmitter now uses channel 1 and 6 only. It’s recommended to habe channel 6 involved, as it’s used for calibration.

At this point, I’ve an important hint. To use the Selecta-function, the Tx2 has to be set to profile-1. This automatically include the inertia-function. If you won’t use the inertia, you’ve to wire pin 6 anyway to avoid failures. To simualte the inertia-pot, simply wire pin 6 to ground and also via 20kOhm resistor to +3.3V. This set’s inertia to inactive. Leaving pin 6 floating causes failures and the transmitter will not work. It took me some time and nerves to figure that out.

ATTENTION – Please read data-sheets and instruction of the components you might use. Any usage of the shared documentation on this blog is to your own risk!

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