Circuit Diagram of Water Activated Sensor Alarm

This is an enhanced version of the simple Garage/Shed Alarm. The entry and exit delays have been increased to approximately 30 seconds, and a timed siren cut-off and automatic reset have been added. The LED has been replaced with an...

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 Sounder For Flex Switch Circuit

This is a cross-sectional diagram of a flex switch. They can be used as pushbuttons or even position sensors. This schematic diagram shows an oscillator, which is used as an alarm sounder, triggered by a flex switch. The flex switch is...

morning sunrise alarm

A project for a morning or sunrise alarm circuit that generates a beep-beep alarm sound and flashes an LED in response to sunlight. This sunrise alarm circuit is designed to provide a gentle awakening experience by utilizing both auditory and visual...

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...

Electronic Locker Guard

Protect your locker or briefcase from theft using this pocket-sized gadget. It emits a loud police siren to attract attention. The circuit utilizes a single integrated circuit (IC). This circuit is designed to provide a compact and effective security solution for...

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...

Gate automatic lamp circuit

The circuit utilizes multiple integrated circuits to form an automatic lighting device that is activated by door and window sensors. It includes CD4093 digital integrated circuits, a relay, and a power supply circuit. The system typically remains closed when a...

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...