Anyway, this is an indoor panic alarm/button tailored just to raise a ‘local’ piercing alert when its panic button is depressed. ![]() There’re various methods that can be used to notify others when a panic button has been touched off by someone. If you’ve done everything right, you should be hearing a very loud ‘latching’ noise when you press the panic button! Voila! There’s your complete panic alarm/button. Needless to say, after completing your assembling task, you’ll need to prepare an enclosure to protect your electronics from invasive hands. When going to build your own electronics, you can of course solder the key components on a small piece of the perforated circuit board. Here’s how I built the prototype on my 9V battery-powered breadboard for a quick evaluation. The final build is yet to be worked out but you can see the proposed enclosure artwork below. A 3D-printed box would have been better, but I made do with what I could get locally. I’ve been on the lookout for a small enclosure that would work for this project for a while and finally found it at a neighbouring store. I definitely need its piezo disc cavity and all other components, but don’t need that big outer shell. At present, my original intention is to dismantle the car reverse horn and use its key parts for my project. It really is loud enough but I may replace it with a diminutive size piezo sounder later. It’s a piezo-based unit that generates a high-pitched warbling siren, runs off of 12VDC at a rated 200mA. The sounder (car reverse horn – see the sample image shown below) is from a local automobile spare parts shop. I used a randomly picked BT169D thyristor but almost any drop-in replacement type will work. Let’s start with the schematic for the project! Schematic Here’re the details in case you want to make your own cheapo panic alarm/button (some assembly required). ![]() Okay, then why not build a budget one yourself? However, a dedicated panic alarm on your home/office adds a valuable layer of security, as it offers a better sense of confidence. ![]() There’re a lot of superb panic alarms on the market but choosing the right device that will not cut into a large chunk of your time and budget is not an easy task. The key purpose of a panic alarm (also called duress alarms, hold-up alarms, or panic buttons) is to allow a person under threat to quickly call for help in the event of an emergency.
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