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DIY Alarm Siren / Simple Noise Maker without transistors using o…

DIY Alarm Siren / Simple Noise Maker without transistors using o...



How to Make simple Noise Maker (alarm device).
This DIY Noise Maker is very helpful if you don't have a buzzer. No need for additional electrical components & easy to make, no need for circuit (schematic) to build. You can use it for diy home security project or simular projects.

I used 3.7 volts cell phone battery for powering the device, if you use higher voltage, maybe you need add 2 - 10 ohms resistor sequentially.

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Tags: transistors

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11 Comments

  1. Date: June 2, 2017 at 22:18
    Author: cathal butler

    Hi Adam,
    I wonder if you could help me, I'm trying to develop a weighing scales that has a built-in max and minimum alarm.
    let me explain I'm in the process of setting up a weight loss business and I don't want my patients to be able to see their weight. Ideally what I want is for them to stand on the weighing scales and if they go over a preset maximum weight, an alarm will go off and similarly if they go below a preset weight an alarm will go off.

  2. Date: July 11, 2017 at 15:45
    Author: waleed raza

    is it necessary to use a screw? why not simply connect both the wires?

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