I am looking for a beeper or similar sounder (using 240 volts) that I can wire up to a PIR a couple of sensors to alert me when intruders who get into to my back yard.
All the ones I can find so far are proper alarm type sounders with an output of over 100 decibels.
Ideally I am looking for something with sound output ( 80db ? ) similar to domestic door chimes but for use both inside and outside the house running on 240 volts. Any suggestions?
VT
surely easy to make one.
Or adapt something similar.
Mains Buzzer
How about a wall-wart driving a small piezo sounder such as
Or even a wall-wart driving a door chime via a relay?
Screwfix used to sell off-the-shelf products that did what you are describing, made by a company called IQ, but they only seem to stock these bits now:
Another option that's easier is a 2" speaker onto a small dc wallwart, via a resistor. Then you've got volume control too. Pick as low a voltage as you've got for the wallwart, 3v or less.
NT
Eh?
It needs to be a supply with no reservoir cap - youre quite right in pointing out that a lot do have such a cap in.
NT
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