On Tue, 15 Jan 2013 09:37:22 -0800 (PST), you wrote: >Hiya everyone! > >Does anyone have any simple schematic or any ideas how to amplify the sound >of a 2 pin piezo? >For now I drive it simply from a controller pin, but the sound is somewhat >quiet for an alarm clock, so I'm looking for something different. > >Thanks! :)
Put a 10-100millihenry Inductor across piezo ( you can get some very cheap axial ones), and drive withan open collector transistor, Note that disconnecting the piezo will produce a high voltage that may kill the transistor unless you use a HV transistor like MPSA42,. if the piezo is solidly connected you can usually use a bog-standard NPN as the piezo will limit the voltage. Also remember that piezos are sharply resonant so tweaking the frequency for loudest output makes a big difference, regardless of how you drive them. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
