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.