Sound-to-Beep Circuit using IC CD4049 is a fun project. Hear whistle which beep for 3 sec. Circuit is good for door alarm, remote control other sound things. It has mic for sound, op-amps from CD4049 and transistor for buzzer. It runs on 3V battery. Circuit Working: Parts List: Component Type Value Quantity Resistors (All resistors […]
Sensors and Detectors
Simple Dark Sensor Circuit for Security using IC 555 timer
Simple Dark Sensor Circuit for Security using IC 555 timer is useful project for security. It senses low light and turns ON the buzzer or light. It is used for LDR as light sensing. Circuit is good for night light and alert system. The circuit have parts like 555 IC, LDR, resistors, capacitor and buzzer […]
Simple Dark Sensor Circuit with Buzzer
Simple Dark Sensor Circuit with Buzzer is a very easy project to make. It detect no light and makes sound. It is uses in night lights, security and alarms. Circuit works with LDR, 555 timer and buzzer. Low light makes buzzer ON. This circuit runs on 9V battery which is small and handy. Circuit Working: […]
Simple LED Alert for Telephone Off-Hook Detection Circuit
This Simple LED Alert for Telephone Off-Hook Detection Circuit shows when phone is in use by turning ON the LED. It checks voltage change when handset is lifted means off-hook. Circuit is good for old phones with no light alert. It is very useful for shared phones and stops call interruptions. Circuit runs on simple […]
Mobile Incoming Call Detector Circuit
Mobile Incoming Call Detector Circuit is smart project. Detect incoming call and make LED light up. Circuit is good for noisy places where ringtone is hard to hear. Catch RF signal from phone when call comes. Use LC circuit, transistor, 555 timer to turn ON LED. Circuit runs on 6V battery and is useful and […]
Metal Detector Circuit using IC CS209A
Metal Detector Circuit using IC CS209A is a cool tool to find metal near by. It is used for security, treasure hunt and in industries. This article shows simple but strong circuit using one chip called CS209A. It is easy to make and works great to detect metal. We can find metal from few inches […]