In many electronic applications, especially those involving sensing and control, the LM339 comparator circuit is a flexible and crucial device. A Light Dependent Resistor LDR, resistors, an LED and the LM339 quad comparator IC allow us to build an easy yet functional circuit that can monitor light levels and offer visual feedback depending on the […]
LDR Circuits
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Simple Electronic Candle Circuit using LDR
An enjoyable and somewhat basic electronics project is to make a simple electronic candle that uses a Light Dependent Resistor LDR to produce a flickering LED flame that switches on automatically in low light. To regulate the LED, which serves as the candles flame, the circuit makes use of the LDR variable resistance. The LED […]
Simple Flasher Circuit using LED and LDR
An LED and an LDR is used to make this simple basic flasher circuit. This circuit controls the LEDs blinking pattern by taking use of the LDRs ability to change resistance in response to light intensity. Without the need of complicated chips or transistors this device produces the effect of blinking LEDs. Basic electrical parts […]
Simple Light Operated Relay Circuit
A light operated relay circuit is like a tiny automatic light switch. It uses a special sensor like an LDR or photodiode that acts like a tiny eye. When it gets light out, the sensor sends a signal to the circuit, which then flips a switch relay on or off. This can be used for […]
Simple Automatic Night Lamp Circuit using IC 555
This circuit is like a smart switch for your night light. It uses a special light sensor LDR to see how bright it is outside. At night, when it gets dark enough the circuit turns on your lamp automatically. Then, in the morning when it gets light again the circuit turns the lamp back off. […]
Simple Backyard Lamp Circuit using IC CD4060
This backyard lamp circuit is like a smart switch for your outdoor lights. It uses a special light sensor LDR to tell the difference between daytime and nighttime. At night, the circuit turns on your backyard lamp automatically. Then, in the morning when it gets light again, the circuit turns the lamp back off. It […]