Franzis Alarm System Electronic Kit
• Build your own alarm which responds to air pressure
• Solder your kit – which includes LEDs, a microphone and a speaker
• Practice soldering and learn how circuits are made
• Create with 12 parts
• Fun for ages 14+
• Requires three AA batteries (not included Order Code L43AL)What can I do with this kit?
Use this alarm kit to build yourself a warning system with no wires or external sensors. Everything fits inside the box it comes in – which doubles as a stylish and useful enclosure. The alarm monitors air pressure, so if you put it in a room then open the windows or doors the alarm recognises the difference in pressure caused by an opening and goes off. You can change several settings in the kit, including the sensitivity of the alarm, the length of activation, and even set a delay.
What can I learn from this kit?
This kit uses an extremely sensitive microphone to detect the air pressure changes. This infrasonic alarm detects air vibration at very low frequencies, similar to how your ear processes sound. Humans can typically hear in the 16Hz-20kHz range – with frequencies lower than 16Hz fall into the infrasonic range and above 20kHz falling into the ultrasonic range. Practice your soldering and see how LEDs, switches and microphones can be connected together in a circuit. This kit requires a soldering iron, solder, three AA batteries (not included Order Code L43AL) and may require wire cutters.
Where can I go from here?
Expand your alarm system with an extra input or output. The alarm comes with an additional connection for a sensor input, such as a reed switch or photo sensor. You can also connect to another output either to increase the noise of the alarm or to have it go off in another area. You could even have it set off a flasher instead of making a noise.
| Number of included parts
| Number of projects that can be made
| What can be made?
|| Air pressure alarm
| System requirements
| Age group, if specified
| Power supply requirements
|| 3 x AA batteries (not included)
|| 160 mm x 110 mm x 30 mm (approximately)
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