Simple wire loop alarm is small security circuit. It uses thin wire as sensor loop. If loop is cut or opened the buzzer will sound. It works on 9V battery, needs few parts, is cheap and easy to make. Circuit Working: Parts List: Component Specification Qty Resistors 4.7M 1/4 watt 1 100k 1/4 watt 1 […]
Buzzer Alert at 0°C Indicator Circuit
In winter season, water and surrounding air can go below zero degree. At that time it is useful to have a small alarm which tells us when temperature goes near freezing point. This Buzzer Alert at 0°C Indicator Circuit uses thermistor sensor, one op-amp IC and a piezo buzzer to make sound alarm when temperature […]
Slow Voltage Rise Power Supply Circuit
Sometimes when our circuit power is ON a big current comes suddenly. This sudden current can damage parts like IC, capacitor and transistor. To stop this we make Slow Voltage Rise Power Supply Circuit. This circuit gives voltage slowly but not full at once. So circuit become safe and work is quite reliable. Circuit Working: […]
LDR Based Aircraft Warning Signal Light Circuit
In tall buildings, towers or high structures it is important to show warning light for aircraft safety. Normally a red 230V LED bulb is used as warning lamp. This LDR Based Aircraft Warning Signal Light Circuit automatically switches ON the bulb in night and switch OFF in day. It uses LDR sensor, relay and small […]
Low Power Led Flasher Circuit using Nand Gate IC
Make your led blink easy with this easy to make Low Power Led Flasher Circuit using Nand Gate IC It uses IC CD 4093, a quad Nand gate with Schmitt trigger input. Circuit makes led blink with very less power and it can run from small 6V battery also. Circuit Working: Parts List: Component type […]
Two Star Flasher Circuit with 555 IC
This simple article is for Two Star Flasher Circuit with 555 IC. Main part is 555 timer IC which works in astable mode. In this mode IC give continuous square wave pulses. These pulses make two lamps blink one by one like star. Blink speed depend on resistors and capacitor values. Transistor are used for […]