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Tx22 Transmitter Kit
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DESCRIPTION:
The Kit includes the core components to make a Tx22 transmitter.
Tx22 is a compact wireless transmitter intended to control model railway train engines.
It has controls for Speed, Direction, Inertia, Lights, Coupling and Loco selection (depending on how used).
KIT CONTENTS:
| Qty | Item | |
| 1 | Medium plastic box | |
| 1 | 3-way Direction toggle switch | |
| 1 | On/Off pushbutton with Led | |
| 1 | Bind pushbutton | |
| 1 | 12-way Selecta rotary switch | |
| 1 | 10k pot 300° rotation with center click (detent) | |
| 1 | 10k pot 300° rotation | |
| 1 | Medium Selecta knob (6.3mm) | |
| 1 | Medium Inertia knob (6mm) | |
| 1 | Large Speed knob (6mm) | |
| 11 | 2k4 resistor | Red-Yellow-Black-Brown-Brown |
| 2 | 10k resistor | Brown-Black-Black-Red-Brown |
| 1 | 7k5 resistor | Violet-Green-Black-Brown-Brown |
| 1 | 12k resistor | Brown-Red-Black-Red-Brown |
| 1 | 18k resistor | Brown-Grey-Black-Red-Brown |
| 1 | 39k resistor | Orange-White-Black-Red-Brown |
| 1 | 62k resistor | Blue-Red-Black-Red-Brown |
| 2 | 100k resistor | Brown-Black-Black-Orange-Brown |
| 200mm | 2.4mm heatshrink for wires | |
| 50mm | 30mm heatshrink for Tx2 | |
| 1 | Plastic sheet for battery compartment | |
| 1 | PP3 plug | |
| 1 | Tx2 | |
| 1 | Circuit diagram | |
| 1 | Drill template | |
| 1 | Wiring guide | |
| 1 | This page (www.DelTang.co.uk/tx22c-kit.htm) |
OTHER ITEMS NEEDED:
PP3 9v battery, hookup wire, contact adhesive
Solder, Soldering iron, Drills, Files, Knife, Screwdrivers etc.
CIRCUIT DIAGRAM:
Tx22 circuit
DRILL TEMPLATE:
Tx22 layout
WIRING GUIDE:
Tx22 wiring
ASSEMBLY EXAMPLE (click to enlarge):
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NOTES:
1. The circuit diagram shows the required connections. The photos and wiring guide are examples of how it can be done.
2. It is easiest to press the black plastic pushbutton into a 7mm hole using a medium knob and nut as spacer.
3. The 'Tx2' radio module is powered with 9v. Tx2 has an on-board regulator which provides a 3.1v reference voltage to the other components.
4. The 2 longer wires in the middle of the on/off switch are 'Led2'. The shorter of those is marked '-' and goes to negative.
5. The on/off switch has an anti-rotation ridge that makes its diameter larger at that point. File a notch in the box to avoid crushing the switch.
6. The pots have a protrusion to prevent body rotation. These are not needed and can be cut off with side-cutters or hacksaw.
7. If the Inertia pot is not installed, Pin6 must be grounded to prevent random motor behavior.
8. The Tx2 module can be protected with with the heatshrink covering provided.
CALIBRATION:
The motor control pot (Ch1) has a 'click' at the center position. When Throttle is used 'center off' it needs to center accurately so that the 'click' on the Tx matches the 'off' position in DelTang receivers. The 12-way Selecta switch (Ch2) can also be calibrated so it associates the same value for each position as other units. Calibration is done using the Bind button while Tx22 is on. After pressing the Bind button for ~20s Ch1 is calibrated and after another 5s Ch2 is calibrated.
1. Switch Tx22 on. The led will come on.
2. Rotate the Inertia button fully anti-clockwise (left) so it has no effect on Throttle.
3. Center the Motor pot.
4. Put the 12-way Selecta switch in the 6 o'clock position (assuming position '1' is at 1 o'clock).
5. Press and hold the Bind button for ~20s until the led goes off. Ch1 should now be calibrated.
6. Release the Bind button if only Ch1 needs calibrating. Continue holding to calibrate Ch2.
7. The led will come on for 3s then the led will go off again. Ch2 should now be calibrated.
8. Release the Bind button. The led will come back on.