shutter guard
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Field disturbance sensor-alarm
The change in ambient light triggers the alarm by changing the resistance of LDR1 and LDR2.
The circuit utilizes two light-dependent resistors (LDR1 and LDR2) to detect variations in ambient light levels. LDRs are passive components that exhibit a change in...
Motion Detector Sensor Circuit
This circuit is a motion detection sensor that utilizes a light source and detector as an infrared motion detector. It incorporates components such as a light-emitting diode (LED), a phototransistor, a transmitter, a receiver, an NE555 timer configured as an...
Scoobas Solution Sensing Tactic
This document serves multiple purposes, primarily to document the methods employed by a Scooba robot to detect: a) the presence of an acceptable cleaning solution being delivered to its pump, and b) the excess presence of used solution collected off...
Simple lock circuit can alarm
The circuit operates as illustrated in Figure 5-2a. It includes an alarm switch (S). When switch S is pressed, relay K is activated, which closes two normally open contacts. This action triggers the alarm bells. The alarm continues to sound...
General-Purpose Alarm
The alarm can be utilized for various applications, including frost monitoring and room temperature monitoring. In its quiescent state, the circuit consumes only a few microamperes, allowing a 9 V dry battery (PP3, 6AM6, MN1604, 6LR61) to potentially last up...
Surveillance Transmitter Detector
The site features several low-power transmitters, but until now, there has been no receiver. This circuit can be utilized to scan an area or room, indicating whether a surveillance device is active. The challenge in creating an effective detector lies...
Do not drink and drive I wish you a safe journey home Language Integrated Circuits
Do not drink and drive. Wishing you a safe journey home. Language Integrated Circuits.
Language Integrated Circuits (LICs) are specialized electronic components designed to facilitate the processing of language-based data within various applications. These circuits integrate multiple functions, such as signal...
Pots water alarm circuit
The flowers in pots require watering, as relying solely on the observation of moist soil surfaces can be unreliable. To address this issue, a flower watering indicator has been developed. This circuit includes a field effect transistor (VT1), a second...
Alarm Power Supply
This power supply is suitable for a modular burglar alarm but can also serve other applications. It is designed to provide a 12-volt output with a current capacity of up to 1 amp. In case of mains failure, the backup...