Tired of those blaring alarms that scream continuously? Unless they are smoke alarms because smoke alarms should be annoying, but it would be nice if others were not. This general purpose alarm will pulse on and off at about a 1 per second rate.
Using an LM556 chip (a "dual timer") with one side used as an oscillator to generate a 2kHz audio tone and the other side to generate a pulsing signal of about 1 Hz to control the oscillator.
The kit includes most of the parts you need, including the PCB (with mounting holes), the chip, the "silence alarm" switch, and the speaker. A 9V battery is supplied, but you may use another power source. You will get some hook-up wire for jumpers and mounting the speaker, and your switch or other circuit for triggering it. Now you can build a handy audio alarm module to use any way you see fit. Check out what others are saying about the General Purpose Pulsed Alarm project build!
Please note: Due to inventory packaging methods, you may receive more components than required for some products.
You Will Need
Soldering iron and solder
De-soldering wick (optional, but may be very helpful to remove solder bridges)
Small needle nose pliers
Small wire cutters
Magnifying glass (very helpful for inspecting your work, but optional)
20 ga insulated hook-up wire (for mounting the speaker)