Product description
Solder kit with 13 red LEDs and a touch sensor. The kit contains exclusively surface-mounted (SMD) components. Good practice kit with easy-to-solder components.
The circuit consists of an OP amplifier, configured as a triangle-wave oscillator, a transistor to drive all the LEDs, and a simple resistive touch sensor. The oscillator speed can be increased by partially short-circuiting the touch sensor when it is touched. When a larger area of the sensor is touched, the resistance becomes lower and the LEDs pulse faster.
