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buzzer only beep once – Circuit Schematic
buzzer only beep once
basically i have what is known as a bite alarm (for fishing). normally bite alarms beep as the fishing line passes over a wheel which usually has notches in it ...
magnetic switch activated alarm – Circuit Schematic
magnetic switch activated alarm
Hello, I assembled a circuit on a breadboard which is separated in 2 parts: the right part is for generating an alarm which wails. the left part is.....
Help with Laser Alarm Circuit – Circuit Schematic
Help with Laser Alarm Circuit
Hey all I`m new to both the forums and electronics. Recently I chanced upon a Laser Alarm System and decided to give it a go.....
creating a two stage alarm siren – Circuit Schematic
creating a two stage alarm siren
I am attempting to design an alarm using a LM555 timer. I dont know where to start. My friends around have been designing them and I am trying to make .....
digital code lock – Circuit Schematic
digital code lock
The project called Digital Code Lock using AT89C2051 ². LCD is used for display and a keyboard is used to input the keys. This project source code is written i...
Temperature Switch Project – Circuit Schematic
Temperature Switch Project
This temperature switch uses a few discrete components to trigger a buzzer when the temperature of the surrounding increases. Suitable for use as a simple fire ...
Phone In Use Electronics Project – Circuit Schematic
Phone In Use Electronics Project
Phone In Use Indicator Electronics Project using 5 resistors, 2 NPN transistors, 4 diodes and 2 light emitting diodes ...
Simple Home Alarm – Circuit Schematic
Simple Home Alarm
This simple home alarm project can be used together with a momentary contact of a motion detector to trigger an alarm similar to police siren for a duration fro...
Power Failure Alarm Project – Circuit Schematic
Power Failure Alarm Project
Build your own simple power failure alarm monitoring system using a AC Relay that will trigger off a buzzer when the mains power supply cuts off ...
Water level buzzer – Circuit Schematic
Water level buzzer
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Electronic Lock – Circuit Schematic
Electronic Lock
This is a simple but efficient Electronic lock. This lock can be used to protect any electronic systems from unauthorized usage. To get access the uses needs to...
UM3561 high temperature detector circuit diagram – Circuit Schematic
UM3561 high temperature detector circuit diagram
This heat detector alarm electronic project is designed using the UM3561 sound generator circuit and some other common electronic parts. This heat detector circ...
Smoke Detector circuit diagram using SD2 IC – Circuit Schematic
Smoke Detector circuit diagram using SD2 IC
This smoke detector circuit diagram is based on the SD2 CMOS Photo-Electric Smoke Detector Integrated Circuit manufactured by Supertex INC and include almost al...
Smoke detector alarm schematic with RE46C140 – Circuit Schematic
Smoke detector alarm schematic with RE46C140
Using the RE46C140 circuit can be designed a very simple smoke detector alarm using few external electronic components. The RE46C140 IC is a low power CMOS phot...
Rain detector electronic circuit project – Circuit Schematic
Rain detector electronic circuit project
This rain detector electronic circuit project is an very simple alarm circuit, that will start an audio warning, if the liquid is present on the sense pad. This...
PIR motion detector circuit electronic project – Circuit Schematic
PIR motion detector circuit electronic project
The op-amp IC1D shapes the frequency response to amplify those frequencies produced when motion is detected and rejects all others, such as those due to noise o...
LM1801 smoke detector circuit design electronic project – Circuit Schematic
LM1801 smoke detector circuit design electronic project
This smoke detector electronic project is designed using LM1801 and common electronic parts. Smoke detector circuit diagram below does not use ionization detect...
Light alarm schematic circuit diagram – Circuit Schematic
Light alarm schematic circuit diagram
This light alarm schematic circuit is designed using some common electronic parts, as you can see in the circuit diagram bellow. This light alarm schematic circ...
Ionization smoke detector circuit using A5367 – Circuit Schematic
Ionization smoke detector circuit using A5367
A very simple Ionization Smoke Detector with Interconnect and Timer alarm circuit can be constructed using the A5367 low-current, CMOS circuit that provides all...
Hydro alarm circuit diagram using CMOS – Circuit Schematic
Hydro alarm circuit diagram using CMOS
Circuit diagram is very simple and works as follows: N1 Schmitt trigger works as an oscillator and produce a frequency of about 1 kHz. If in the tank is still e...