LDRs or Light Dependent Resistors are very useful especially in light/dark sensor circuits. Normally the resistance of an LDR is very high, sometimes as high as 1000 000 ohms, but when they are ...

This circuit is powered using a 12 volts DC power supply , so the relay used for this project must be a 12 volts relay . This circuit is working very simple , when both plates of the sensor are ...

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 ...

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 ...

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) ...

Smart Textiles Blend LEDs, Circuits and Sensors. ... Once you have the helmet comfortably on your head, activate it with a switch on the chinstrap. The apology will play when you move your jaw.