door handle alarm
No description available.
Automatic plant waterer
The unit consists of a sensor, timer, and electric water pump. The sensor is embedded in the soil, and when dry, the electronics operate the water pump for a preset time. The circuit is composed of a level-sensitive Schmitt trigger,...
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...
Single-Ic Alarm
With a single integrated circuit (IC), it is possible to construct a straightforward and dependable auto burglar alarm or a similar alarm system. Refer to (a) for the timing information related to the alarm circuit in (b). When leaving the...
Single Zone Alarm
A single zone alarm circuit with entry and exit delay and other facilities. The circuit features automatic exit and entry delays, timed bell cut-off and system reset. It has provision for normally open and normally closed switches and will suit...
Mini Alarms
This is a selection of small self-contained alarm circuits. They have a very low standby current; and are suitable for battery operation.
The described alarm circuits are compact and designed for low power consumption, making them ideal for battery-powered applications. These...
Menci alarm produced schematic circuit diagram
The alarm circuit operates as follows: When the power switch SW1 is turned on, the alarm system becomes active. If a magnet is brought close to the spring, the magnetic field attracts the spring, causing the dynamic and static switch...
1000Hz Pulsed Tone Alarm Circuit
IC1 generates a pulse that modulates the 1000-Hz tone generated by IC2. This circuit can be used to generate warning or alert signals.
The circuit described consists of two integrated circuits (ICs), where IC1 is responsible for generating a pulse signal...
Automatic Room light Control With Bi Directional Visitor Counter
The objective of this project is to create a controller-based model that counts the number of individuals entering a specific room and activates the lighting accordingly. This is achieved through the use of sensors that detect the current number of...
Personal Alarm
This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag...