I have used Red and Green LED’s. When node A is positive green LED glows while when node B is positive, Red LED glows. This indicates polarity of the input d.c voltage . 2) LED as a Continuity tester: ...

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 – ...

A switch in a circuit is any component that can open or close the circuit loop. You can simulate a switch by connecting and then disconnecting one of the battery leads from one of the LED leads.

Sanjay, inspect the circuit diagram again, each of the LED and switch sub-modules are series-connected. The topology is equivalent, I just drew it in a manner that you may have found confusing ...

Make paper switches Place the two ends of the switch ... "For LED circuits, you can simply tape the LEDs on to the copper traces to make the connection," explains Qi.

A switch is a device that opens or closes circuits. When a switch is in the 'off' position, ... The other is called a 'parallel circuit'. The two LEDs in this picture are connected in SERIES.

If you use a standard bulb it behaves as the "medium" circuit, so you get the off-off-on-on behavior. You can get 3-way LED bulbs that have two independent circuits, but they cost more.

Figure 1 illustrates a coordinated protection scheme for switch-mode power supplies and LED driver inputs and outputs. As shown on the left-hand side of the figure, PPTC device (eg Tyco’s PolySwitch) ...

A switch is a device that opens or closes circuits. When a switch is in the 'off' position, ... The other is called a 'parallel circuit'. The two LEDs in this picture are connected in SERIES.