Review on Honeywell Ademco 748 119Db Dual Tone by Jared Tovar

I tested the resulting siren with a voltage regulated benchtop DC power supply, which told me the current drawn at various test voltages. The siren produced both continuous and trilling tones at all voltages I tested - from 4V to 14V. The attached data sheet states the rated voltage at 12V DC with a maximum current of 1.2A at that voltage. I don't have a sound level meter, so I didn't measure the sound level at different voltages, but the tone at 14V was definitely louder than at 4V. The wobble current used about 15% or 20% more current than the continuous tone (when wobble - and continuous tone wires are both energized, only the continuous tone will sound). These are my measurements of the trill's current draw, rounded up. nearest tenth of an amp: 14V: 1.0A; 13V: 0.9A; 12V: 0.9A; 11V: 0.8A; 10V: 0.8A; 9V: 0.7A; 8V: 0.7A; 7V: 0.6A; 6V: 0.5A; 5V: 0.4A; 4V: 0.3A. Of course, you should use a power supply that fits the specs, not "any type on the internet" numbers. I happen to have a spare 12V 1A wall transformer that doesn't meet the 1.2A specification, but my testing shows it can be used. Note that anyone wanting to use it with Z-Wave will need a Z-Wave Controlled Receptacle Plug, an AC to 12V DC transformer to plug into the Z-Wave socket and then be ready to connect the transformer to the siren - either by soldering the connector to the siren wires that connect to the transformer connector, or cut the transformer output connector and connect the transformer output wires to the siren power input wires. Therefore, some basic electrical knowledge is required (e.g. observe polarity!)