2014-10-02 (Th) tDCS Unit

The parts were investigated to find the easiest way to build the constant current diode into the package. There was enough space above the integrated switch in the battery holder so the wire leads were pushed into the enclosure from the outside. The red lead was trimmed to approximately one inch or 25mm, stripped and tinned. The anode end of the diode was soldered to the short wire and the remaining red wire was stripped, tinned, and soldered to the other end of the diode.

 Parts brought together for assembly

Leads pushed into enclosure

Red lead trimmed to one inch or 25mm

Constant current diode soldered inline with red lead

Shrink tubing was put over the diode and shrunk with a pocket lighter. The wire and diode were placed on top of the switch and loosely held in place with tension. The circuit was connected to an ammeter with no load and energized. The reading was slightly higher than 2mA but well within the desired range.

 Diode covered with shrink tube

Diode tucked into battery case

Milliamp reading of unit

Electrodes and leads were ordered from Amazon. The leads use an unknown type of connector and standard electrode pins on the other side. The electrodes were small reusable types. New ideas were had about the implementation of the device and parts as well as the testing unit. The tDCS unit itself is being designed so that copies can easily be made by amateur electrical hobbyists in a short workshop. The testing unit will be used after assembly to ensure proper operation. Buying electrode leads with a 3.5mm plug would eliminate some soldering in the future.

To do:
  • Reverse leads on phono socket
  • Order parts for video demonstration including 3.5mm inline socket
  • Build electrode lead wires
  • Buy parts for testing unit
    • 2 @ 3.5mm panel mount mono phone sockets
    • 3 wire terminal lugs
  • Build testing unit
  • Modify ordered lead wires with 3.5mm phono male plug
  • Test with mental aptitude tests

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