This is a multi-part message in MIME format. ------=_NextPart_000_062F_01C74860.6B408800 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi Vasile > Joe, I'll go further with the question. What the hack need this > circuit an enable input as long the driving signal could be tied to > ground by command ? What I'm doing is experimenting with the circuit to find out what's going to be useful in different applications > Only a series inductance with the piezo, computed on the resonant > frequency of the piezo and one diode to protect the CE of the signal > driver transistor against inverse voltage is required here. The rest > is unuseless. Now, you say series, and I've seen that mentioned a couple of times elsewhere, but parallel seems more common. For example Murata suggest a few 10s of mH in parallel with their elements. You'll see in the attached schematic how the voltage has been boosted by the inductors, in this case small transformers/chokes. This sound bomb is very loud (105dB), and took two towels to muffle so I could take some readings Also attached is a little logic problem. It's the footprint of one of the transformer-like inductors, showing the 0V and piezo connections in-circuit. For the life of me I can't figure out how it might be wound and internally configured. I thought it might be a small impedance- matching audio transformer, but there's no isolation. There seem to be basic windings with 45 ohm DC resistance, perhaps some centre- tapping, but beyond that I don't know. Anyone have a clue ? Using this method http://www.thekeeser.com/Electronics%20info/measure_an_unknown_inductor.htm I get 37mH at 4580Hz from A or B to 0V pin, with C=33nF, the approximate capacitance of the piezo, so I guess no matter what that 'transformer' actually is, it's the effective inductance that's important, and 37mH is definitely in the suggested range > A piezo may sound loudly if it's mounted into a resonant chamber. > Such chamber could increase the noise from 50dB to more than > 90dB measured at 1 m in front of the piezo keeping the same driving > voltage That's quite true. SPL is very dependent on mounting and enclosure. I'd say, from my tinkering, that there's more to gain from driving with the correct frequency and mounting them properly than from simply increasing the voltage > All piezo sirens used in alarm systems are based on this tehnique. > But most of them run at 12V because the resonance is producing a > higher voltage on piezo. BTW, standard piezo are almost dying at 50V > ac across them. You may hear the effect, it's a very high frequency > wistle over the driving frequency range. The small ones I have do sound being over-driven. However, note that the sound bomb does have a fairly square-ish 50V as the output and the tone is penetratingly clear ------=_NextPart_000_062F_01C74860.6B408800 Content-Type: image/gif; name="sound_bomb.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="sound_bomb.gif" R0lGODlhzgEtAYAAAAAAAP///ywAAAAAzgEtAUAC/oyPqcvtD6OctNqLs968+w+G4kiW5ommqgoE LdK+KxoDtm3JsCHr8w/E+ILE03By9PRch1gzlLxEi9SqlTG9aiO6rMO7pYAl47D5LCqjS0se0w26 4RRtZl1t/ODX/D7SD4iVsRdIKBiImCimmGj4xgjhSAdJWQlnuSaJ2aC5s/np1wnaIVc6Nyqkh7oa Jsr66jT54rpAS9t61pViS6VLcvuah1Rz2nQqB3Os7MtTzPawFP3kGOtyQ0NKFIvsqVQYrIYD3DdO KVqe+Z1Wu+KKbvX+ZXYefBiqOOZeH885n10/CRC6Hshm5SDjLaGWI2Cc/XkIjRrCSPzgbRHHaVmX /mUJCDpMxWWdnYP3KO7iIjGkyUECL1arlG+Ekywx7bkxOPJNxVE7IfJJ+eQmqWuIag6VVqEnS53T gnKDZPTjP3JFG03kwAsgzKtiXj7q2FKdWGgKtZqdmuwsWLUzjLJ9CxeN0rdu49q9G2Qu3Lp4GTHr G9KH166LrHULynQWUbV6v6JqvJXcHccgAZtoDBkbRJySkOakzMJyQNGqfmQ2gsfrYJtVSSN2jVUm McZ5obo2dRr2F5qHcX6uVgf0L3Z09EGpZVy3cr9xCWE8/CyH6uXUN+UGQlCs1OrczWbtDj58lZkj 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