Alternative version of the popular circuit, 3V battery supply – Still operating at 1.3V The main purpose of this design was to obviate a small defect of the very popular Fridge Door Alarm circuit, ...
Use this refrigerator alarm circuit to prevent leaving the fridge door open by sending out an alarm signal every time the door is left open for some time. The sensor of the alarm is an LDR. After a ...
YouTube on MSN: Simple DIY alarm for windows, doors, and anything else
In this video, I experiment with creating a window and door alarm using the following materials: a small piece of wood, a mini piezo buzzer, 22 gauge conductor, a battery socket, a 3V battery, an SPDT ...
MSN: How to Make a Door Alarm Simple - Theft Alert Alarm
Learn how to make a simple door alarm to enhance your home security with our step-by-step guide. This DIY theft alert alarm is perfect for keeping unwanted guests away and protecting your belongings.
We are in a digital era! Now we can add some intelligence to our doors and gates without too much investments. Just assemble this little door timer circuit built around a few cheap and simple ...
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