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Science Forum Index » Electronics - Repair Forum » QST: VAC Board and Piezo Siren...
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| Bob... |
 Posted: Fri Jul 11, 2008 12:04 pm |
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Guest
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Hi!
The Original Piezo diaphragm was a standard 2" in a 3"
Element,........
I tried a standard 4/28 (12Vdc) Piezo Horn alarm/siren at a store
(Ralph's...) to test, and I got about what would sound like 2-->3 volts
going through it,...... not loud, hardly audible for an alarm.
I tried a 4/28 (12Vdc) Metal Buzzer Alarm at home with 40ohm
resistance, and the Alarm Board emitted 40VAConly, and the Alarm was not
audible. The VOMs are a factor in the alarm. The more ohms the more VAC
output.
Do you think 12volt transducer using VOMs at a "4 volt VDC
capacity" would sound loud since it would drop from Ultrasonic 40Khz to
Sonic 5Khz...?
Thanx
Bob |
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