Build Instructions

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• 1

  The Prototype

  So I built a prototype with what I had lying around.

  • 1 TTP223
  • 1 Zener Dioder 5.1V
  • 1 2k2 Resistor
  • 1 1k5 Resistor
  • 1 BD137 Transistor

  Panelized Design 6 x 12V TTP223 Touch Controller

• 2

  PCB Design

  First the schematic. I also included a flyback diode in the design, so you can also directly control a relay. The TTP223 chip has the same components as on the small original board. As on that, the 22pf capacitor is optional and is used to control the sensitivity of the touch controller. An FMMT617-625 comes into play as the transitor. You can also use another one. However, according to the data sheet, this one delivers 18V 3A. But I won’t go over 2.5A, just to be on the safe side :)

  Panelized Design 6 x 12V TTP223 Touch Controller

• 3

  Part List

  • 1 TTP223 SOT23-6 Chip
  • 1 Q1 FMMT617-625 SOT23 Transistor or equivalent
  • 1 D1 1N4148W SOT123 (optional)
  • 1 BZX BZX84 4.7V or 5.1V SOT23
  • 1 R1 Resistor 2k2 1206
  • 1 R2 Resistor 1k5 1206
  • 1 C1 Capacitor 100nF 1206
  • 1 C2 Capacitor 22pF 1206 (optional)

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