Here is a great collection of touch switch circuits. A touch switch is an electronic device that enables us to control a circuit by simply touching a sensor. Simple touch switch ... on pin 3 goes high ...

could be used but I found no simple circuits. My first thought was just to connect a series current limiting resistor and LED to the cathode so that the LED would light when the reference ...

The first video is a simple circuit with ... features the same resistor/switches/LEDs, this time in a parallel circuit. Turning on the first switch makes the first LED light up, and the second ...

If you want to easily control the power in a circuit, you’ll probably reach for the classic toggle switch. While there ... with a slick way to control the LED lighting in his 3D printer ...

Older designs relied on simple resistors to limit LED drive current, but designing an LED circuit based on the typical forward ... Figure 1 illustrates a coordinated protection scheme for switch-mode ...