Indicator Circuits

Logic NAND Gate Circuit using Transistors is very important in digital logic. It work opposite of AND gate. Output is HIGH when any input is LOW. NAND gate is called “universal gate” because we can make all other gates like AND, OR, NOT using it. Truth Table for Logic NAND Gate: Input A Input B […]

This project is Simple Traffic Signal Lights Circuit using IC 555. It uses 555 IC and LEDs to show traffic signal lights in sequence. The circuit is simple to build and parts are easy to find. Circuit Working: Parts List: Category Description Quantity Resistors 470Ω, 100k, 47k 1/4 watt 1 each 220Ω 1/4 watt 2 […]

Digital Dice Circuit is small electronic like thing. It work like real dice and shows number from 1 to 6. It uses lights and buttons which is no need to throw. This circuit is good for games and fun. Circuit Working: Parts List: Component Type Value Quantity Resistors (All resistors are 1/4 watt) 1k 2 […]

This for Low Battery Indicator with Buzzer Circuit is very simple and uses basic idea and few parts. Buzzer make sound when battery is low and warn us. It help us to know when to change the battery so device do not stop suddenly. Circuit Working: Parts List: Component Type Value Quantity Resistors (All resistors […]

This Simplest Blown Fuse Indicator Circuit shows if fuse is good or bad without checking it by hand. If fuse is okay then green LED turns ON. If fuse blows then green LED goes OFF and red LED turns ON. That means fuse is bad and needs to change. Circuit Working: Parts List: Component Description […]

Reed switch is small switch which works with magnet. When wire is near it has current and it makes magnetic field. This magnetic field make reed switch turn ON or OFF depends how it is made. It help to know if current is there. Circuit Working: Parts List: Component Type Description Quantity Resistor 470Ω 1/4 […]