Fire siren model

SKU: 110121

Fire siren model

€5,59
€5,59
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Fire siren model that very simply and faithfully imitates the low and high sounds that are normally heard when a fire siren is triggered. Supplied without 4.5 V battery.

This circuit is a combination of the circuits for the acoustic alarm and the sound switch. The sound signal is produced by a self-powered amplifier set by a 0.15 μF capacitor connected to the input and which allows it to oscillate. The 0.45 μF and 22 μF capacitors allow this signal to be transformed into a more pleasant sound. The RC chain, that is, the input resistance in combination with the 100 μF capacitor, determines the speed at which the sound increases and decreases. The period of increase and decrease of the signal is determined by the Flip-Flop of the control circuit, through the two RC chains, composed of the 470 μF capacitors and the corresponding resistors of 12 and 10 KOhm.

Tools needed:

Welder 30 W
Electronic soldering wire (with flux)
Pliers
Hammer

Recommended age:
12+

Construction time:
3-4 h.

Tools:

Download the instruction manual

Pairs well with

NOTICE: If the box/packaging is dented or damaged, and/or the protections are broken, this observation must be indicated on the carrier's delivery note. Once the goods have been delivered, and without any incidents on the carrier's delivery note, the customer will be responsible for any visible damage.

After receiving your order, you have 14 working days to exchange or return the product(s) purchased. This option is valid for the vast majority of items available on the website, with the following exceptions:

  • Items that are made to order, according to the customer's instructions, cannot be exchanged or returned;
  • Items whose sale involves installation on site cannot be exchanged or returned;
  • Items that are damaged due to use, are not in their original packaging, or are incomplete cannot be exchanged or returned.
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