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Components Required: 1) Breadboard 2) 1N4007 Diode 3) 470 ohm resistor 4) 100 Kilo ohm Potentiometer 5) LED (Any Color) 6) 9Volt Battery 7) Digital Multimeter Procedure: Connect the 1N4007 diode and 470 Ω resistor to one fixed terminal of 100 Kilo ohm Potentiometer in series. Connect the variable terminal of potentiometer to the LED in series in a breadboard.  Connect the 9V battery's positive end to the anode of 1N4007 diode and negative end to the cathode of the LED as shown in the circuit diagram below. Measure the voltage across various points by altering the potentiometer value using a digital multimeter and note the change in brightness of the LED accordingly. Circuit Diagram:     Figure 1: LED Brightness Control using Potentiometer Circuit simulation made in Multisim   Figure 2: LED Brightness Control using Potentiometer (100% Brighrness) Figure 3: LED Brightness Control using Potentiometer (50% Brighrness)

Components Required: 1) Breadboard 2) 1N4007 Diode 3) 470 ohm resistor 4) 15 Kilo ohm Light Dependent Resistor (LDR) 5) LED (Any Color) 6) 9Volt Battery 7) Digital Multimeter  Procedure: Connect the 1N4007 diode and 470 Ω resistor to one terminal of 15 Kilo ohm Light Dependent Resistor (LDR) in series. Connect the other terminal of LDR to the LED in series in a breadboard.  Connect the 9V battery's positive end to the anode of 1N4007 diode and negative end to the cathode of the LED as shown in the circuit diagram below. Measure the voltage across various points by altering the Light input on the LDR using a digital multimeter and note the change in brightness of the LED accordingly. Observe the change in LED brightness in a dark room and in a bright light. Here I have used a cap to cover the surface of the LDR to observe the change in LED brightness. Also observe the change in resistance value of the LDR using a digital multimeter which is the cause for the alteration in LED...

Going by car the highway with your high-beam headlights can actually increase your visibility, but can be a blinding hazard for other drivers. This easy circuit can be connected into your headlight swap to provide automatic swaping between high and reduced beam headlights when there is oncoming traffic. It does this by feeling the lights of that traffic. In this way, you can propel securely with your high-beams on without blinding other drivers.    Automatic Headlight Brightness Switch Circuit Diagram Q1 should me mounted in such a way so it points toward the front of the car with a clear line of site.  Suitable places are on the dashboard, in the front grill, etc. Adjust all the pots for proper response by testing on a deserted road. S1 enables and disables the circuit.B1 is, obviously, in the car already. Before you try to connect this circuit, get a wiring diagram for your car.  Some auto manufacturers do weird things with wiring. Connection A goes to the high be...