This Simple LED Heart Blinker Circuit with IC 555 Timer is very easy project. It uses one timer IC and one transistor. LEDs are fixed in heart shape so it looks nice. When we give 9V battery power then LEDs start blinking in heart pattern. This project is easy for beginners. It is also good […]
Digital Display AC Line Tester Circuit
This project for Digital Display AC Line Tester Circuit is a small electronic tester used to detect the presence of mains AC voltage without direct contact. It is a wireless mains voltage tester. When the sensing probe comes near a live AC wire then the circuit detects the field and shows the count on a […]
555 IC Based Schmitt Trigger Circuit
555 IC Based Schmitt Trigger Circuit is a small project. It work like comparator and comparator is ON/OFF when input cross the voltage. Noise make output jump and Schmitt Trigger stop this. It have 2 limit: high and low. Input goes high then output is ON. Input goes low then output is OFF. Between them […]
Simple Wire Loop Security Alarm Circuit
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: […]