FK233 Siren Fire Engine Sounder



FK233 Siren Fire Engine Type Style Cycles Hi-Low  Great classroom project. 

Our most popular Siren project for class rooms.

The wailing siren increases in frequency the longer you hold the button down, then it decreases after you release the button. This is an interesting and enjoyable demonstration of using Resistors and Capacitors to control  a “frequency”.

Can be fitted to toys. Supplied with speaker.  Dimensions: 105mm  x30.5mm

A detailed construction guide is available free of charge to Teachers upon request.  The guide  includes step-by-step photos of the assembly process.

Extra “Teacher support  materials”  for this kit also available upon request.  These include extension activities, background information for new Teachers, as well as tips and suggestions on avoiding the most common problems.

Power 9V 75mA  (5mA standby).


Price inc GST 

Additional information

Weight 0.07 kg
Dimensions 13.5 × 10.5 × 2.5 cm
Year Level

Year 8, Year 9, Year 10


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