Touchpad Soldering Kit

Touchpad Soldering Kit
Touchpad Soldering Kit
Touchpad Soldering Kit
Touchpad Soldering Kit

Touchpad Soldering Kit

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Explore how a small current can turn on an LED. Use these components to make a touch-based lamp, fruit switch, or a humidity sensor.

$10.00

This pre-soldered Touchpad board is an introduction to transistors and exploring how objects may be conductive while having high resistance.

The Touchpad uses a small current to switch the transistor allowing students to explore with different types of conductive materials.

Note: This item only ships to US addresses. 

What's Included:

  • 2032 Battery
  • Battery Holder
  • Switch
  • 1 x 220Ohm Resistor
  • 1 x NPN Transistor
  • 1 x 5mm White LED 


WHAT IS A TRANSISTOR?

A transistor is a semiconductor device. A small current or voltage at the base can control a much larger current flowing through the other leads. 

HOW TOUCHPAD WORKS? 

When the current at the Base is at 0 Volts, the transistor is in cutoff (OFF) mode. When a very small current is applied to the transistor Base, it changes it from cutoff (OFF) to saturation (ON) mode allowing the LED to turn on. 

This circuit uses an NPN transistor that looks like this. 

In a circuit diagram, the transistor is shown with a C for Collector, B for Base and E for emitter. A small voltage into the base allows a larger current to pass through the collector into the emitter.