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 […]
Simple Non-Contact 220V AC Detector Circuit using IC 555
Playing with electric wire is risky especially if we do not know electronics. Wrong use of electricity can be dangerous. So better to be safe before touching wire and first check if some electricity with leakage voltage is still there. This article for Simple Non-Contact 220V AC Detector Circuit using IC 555 show how to […]
Broken Cable Detector Circuit using IC CD 4069
This post is for Broken Cable Detector Circuit using IC CD 4069. In this circuit there is no need to open wire to check. It work like metal finder but find AC current in wire but not in metal. It uses chip CD 4069 and this chip has small switches to turn ON light or […]
Single Push Button ON OFF Relay Circuit
We can make Single Push Button ON OFF Relay Circuit with one push button to control motor or light. Press button and relay will turn ON. Press again and relay will turn OFF. No need of microcontroller or timer IC. Use only some transistors and one capacitor. Circuit Working: Parts List: Component Type Description Quantity […]
Touch Alarm Circuit using IC 555
Touch metal part and buzzer makes sound. This uses IC 555 in monostable mode. IC 555 is good for learning in simple circuits. In this Touch Alarm Circuit using IC 555 when someone touches the metal plate then buzzer makes loud alarm. Circuit Working: Parts List: Component Type Description Quantity Resistors 1M 1/4 watt 1 […]
Electronic Horn Circuit using IC 555
Using popular IC 555 we can make Electronic Horn Circuit for cycle, alarm or fun use. This Electronic Horn Circuit using IC 555 and one 8Ω speaker makes loud horn sound for car or alarm. One 555 work as astable multivibrator which means it make square wave by switching high and low voltage again and […]