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 circuit with 4011 – ...

2) LED as a Continuity tester: The above shown circuit is LED as continuity tester. This circuit is used for checking continuity of cables, connectors and switches. When A and B terminals are shorted, ...

You can connect multiple LEDs to one battery in two different ways. The one in this picture is called a 'series circuit'. The other is called a 'parallel circuit'. The two LEDs in this picture are ...

1. Gather your kit You'll need LEDs for surface-mount technology -- the small components you see on circuit boards -- to lie flat against your page. And get a power supply too: "Coin cell ...

Many equipment manufacturers prefer protection circuits combining resettable overcurrent protection devices with upstream fail-safe protection. In this example, R1 represents a ballast resistor used ...

Print News in Science Play dough circuits 2: experiment with electricity Last time, we went through the basics of how to make simple electrical circuits with play dough and light-emitting diodes ...