The RoLP Sounder is an affordable wall-mounted audible signalling device, suitable for use in open areas, corridors, and passages. Designed for fire alarm systems, intruder alarms, and industrial signalling, the unit can produce 32 selectable tones via the coding switch on the rear.
A second tone can be activated remotely using the third terminal, and a volume adjustment allows fine-tuning of the output. Connections are made via a screw terminal block with loop-in/loop-out terminals for ease of installation. The sounder is fixed using a bespoke shallow clip-on lockable base.
Operation
The sounder is normally off, drawing no power until voltage is applied to the appropriate terminals. It accepts 9–15 V DC or 18–28 V DC, with a polarity protection diode and RC network providing supply smoothing and noise immunity. Additional protection is built in against voltage spikes.
A microprocessor at the heart of the device is powered via a linear voltage regulator, with tone generation and synchronisation controlled by an oscillator clock crystal and capacitor network. The microprocessor outputs pulses to a transistor-driven push/pull amplifier, which powers the loudspeaker. Output volume can be adjusted via the volume control, and a remote second-tone activation is achieved by connecting the “2nd TONE –” terminal to ground, prompting the microprocessor to generate an alternative tone.
Key Features
102 dB(A) sound output
32 user-selectable tones
Two-stage alarm capability
Automatic synchronisation
Suitable for general signalling and fire applications
Fire-approved and general signalling tone options
Alert and alarm functions
Improved tone clarity to reduce confusion