SOUND SENSING CIRCUITS

Op Amp-based Sound Detector

Ultrasonic Transmitter

Ultrasonic Receiver

LIGHT SENSING CIRCUITS

Light-Activated Buzzer

Darkness-Activated Buzzer

Light-Controlled Oscillator

Comparator-based Light Detector

TEMPERATURE SENSING CIRCUITS

Flame/Fire Detecting Circuit

LM335-based Temperature Sensor

EVENT DETECTION CIRCUITS

Touch-Triggered Switch

Missing Pulse Detector

Peak Voltage Detector

Event Interruption Alarm

Dual Op-Amp Window Comparator

Digital Counter Circuits

OTHER SENSING CIRCUITS

Water Level Sensing Circuit