simple light sensitive alarm
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Light Level Droplets Detector
This circuit is a Low-Light Level Drop Detector. It utilizes a self-biasing configuration to detect small changes in light levels.
The Low-Light Level Drop Detector circuit is designed to sense minute variations in ambient light conditions, making it suitable for applications...
Allarm circuit
Building a personal alarm system is both practical and engaging. The most rewarding aspect is demonstrating its functionality to friends by activating the alarm remotely, saying, "I completed this in a weekend." Customizing the alarm system offers maximum flexibility, allowing...
Alarm
This is a simple and easy-to-build multi-tone alarm circuit that can be utilized in burglar alarms or sirens. The circuit is based on the dual op-amp MC1458 and LM380. The two op-amps within the MC1458 are configured to generate square...
Auto Alarm
SI is an external key switch. The alarm allows a delay of 0 to 45 seconds after SI is operated before the circuit is armed. During this period, LED1 lights up green. After this delay, LED1 lights red, indicating that...
Super Light Sensor
This Super Light Sensor responds to minute fluctuations in light levels, automatically adjusting from approximately 200 lux to 60,000 lux (from a modestly lit room to direct sunlight). It has various potential applications, such as detecting a car entering a...
No Doze Alarm Circuit
This circuit emits a loud tone if the input switch (S2) is not retriggered at designated intervals. If the user falls asleep and fails to re-trigger the circuit, it will continue to sound until S2 is pressed.
The circuit operates on...
Simple Alarm circuit
A simple alarm circuit with a diagram and schematic that generates a multi-tone sound. This alarm circuit is suitable for use in burglar alarms and sirens and is designed using dual op-amps MC1458 and LM380.
The described alarm circuit utilizes dual...
Automatic Night Lamp with Morning Alarm
This circuit automatically activates a night lamp when the bedroom light is turned off. The lamp stays illuminated until the light sensor detects daylight in the morning. A super-bright white LED is utilized as the night lamp, providing bright and...
6V Light Barrier Sensor Detector
The following circuit illustrates a Light Barrier Sensor Detector Circuit Diagram. Features include a single transistor, an adjustable potentiometer, and a 6V power supply.
The Light Barrier Sensor Detector Circuit is designed to detect the presence of an object by utilizing...