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3224 |
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| An extremely loud two-tone piezo-electric siren mounted in a sturdy cream plastic case. The electronics which drive the piezo element and give the siren its characteristic sound, are contained within the unit on a PCB, and the overall frequency range can be varied by means of a preset on this board. Two links, A and B, are also present which, if bridged with solder, determine the mode of operation (see table). The board is accessible by removing the bottom mounting plate (secured by four screws) from the main body |
| Both links open: |
Single tone operation |
| Link A bridged: |
Pulsed high tone |
| Link B bridged: |
Two-tone (as supplied) |
| Both links bridged: |
Pulsed low tone |
| The unit will work with supply voltages between 6 and 15V DC and is connected to the supply with the two colour-coded 150mm long leads (red: +V; black: 0V) provided. At 12Vdc, the unit will supply 110dB of sound level (at 30cm) while drawing only 90mA. Two mounting lugs are moulded onto the bottom mounting plate, which will accommodate M3 screws, and are spaced 58mm apart. |
| Overall case dimensions, 52x42x27ยท 5mm. The mounting lugs are 68mm from tip to tip. |
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