Piezo Transducers with Feedback Electrodes - Short Circuits 4

Single transistor circuit to drive piezo transducers with feedback electrodes and how to make two wire piezo transducer to have feedback by cutting the top electrode.

Category:

Science & Technology

Tags:

• Piezo
• short circuits
• electronics

[lotec11]

Also, can you talk about why I might want one of these? Self oscillation ... hmmm ... what can I do with self oscillation as opposed to altering the driver pattern?

[jeriellsworth]

@lotec11 I will try to do this sometime in the future, but I don't have much time for a few months.

[4833504F]

"and how to make two wire piezo transducer to have feedback by cutting the top electrode"

did i miss anything? this would be really interesting.

[jeriellsworth]

I'll have to check. I may have left out that you can cut a triangle in the top electrode and solder a wire to it. The size of the electrode you cut out determines the frequency it likes to resonate at.

[4833504F]

But how could one cut the electrode without damaging the crystal?

[jeriellsworth]

The electrode is very thin. I scratch it with an exacto knife.

There are some guys cutting disk piezo disks for microscopy.

[lastfuture]

I accidentally bought one of those piezo transducers when I meant to buy a regular two-pole one and didn't know the difference. I've wired it up to use the metal base plus the small part of the top electrode, the part that you use for feedback. It sounded pretty quiet. Would it sound louder if I used the bigger part of the top electrode instead? and would it sound even louder if I connected both?

[vasuthinkbig]

Nice explanation. Thanks for the video :)

[lotec11]

@jeriellsworth thanks!

[lotec11]

@iorixs rephrase sentence plz

[lotec11]

Hi Jerri - can you talk a bit about the driver circuitry? Piezoelectric devices typically operate at high voltages right?

[raindogred]

piezoelectric phenomena is fascinating. I started out wanting make a contact guitar pickup then I find that they are used in phones, alarms, seismic, pingers, sonar and of most interest energy harvesting under roads - currently doing this israel. anyone got a good schemo for piezo guitar preamp please pm me

[dubeyanupam]

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[madamerotten]

I really like this video. You gave a great explanation. You may want to correct the erroneous reference to "PNP" transistor at 2:26.