Fridge door alarm project
#alarm
#sensor
#door sensor
#buzzer
#security
#home automation
#simple circuit
#DIY
#electronics project
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Glue stck torch
This project, developed around 2005, involves constructing a torch using a glue stick, which conveniently accommodates an AA battery within its plastic casing. To create a functional battery holder, contacts for both the positive and negative connections are necessary. The...
Crescendo ampilifier elektor1982
The Elector Crescendo was the first DIY amplifier that was not a kit. The design was sourced from the Elector magazines available at a local library.
The Elector Crescendo is an innovative audio amplifier designed for DIY enthusiasts. It features a...
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...
Door ajar alarm circuit
Have you ever accidentally left your front door ajar and had a pet escape? This circuit offers a smart solution to this problem. It is relatively simple yet serves as an excellent example.
The circuit designed to prevent pets from escaping...
Security Monitor
This circuit can be utilized in a garden setting to detect unusual sounds or wildlife noises. It can also monitor sounds around a car parked in a remote location. The cable used for the setup can either be visible or...
An Enhanced Shed / Garage Alarm circuit
This is an improved version of the basic Garage/Shed Alarm. The Entry and Exit delays have been extended to approximately 30 seconds, and a timed Siren cut-off along with an automatic reset feature has been added. Additionally, the LED has...
Buzzer Circuit
This project involves connecting the positive terminal of the battery to the positive lead of the buzzer and the negative terminal of the battery to the negative lead of the buzzer. Typically, the positive lead of the buzzer is red,...
Automatic Turn-Off Alarm With Delay
In this circuit, IC1A and IC1B serve as a monostable multivibrator. Any input from the sensors SI through S5 triggers IC1A to produce a logic low signal, which activates IC1B, turning on Q1 until the capacitor C3 discharges through resistor...
Two HiJack Alarms
The first circuit was designed for the situation where a hijacker forces the driver from the vehicle. If a door is opened while the ignition is switched on - the circuit will trip. After a few minutes delay - when...