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piezo driver

Pommie

Well-Known Member
Most Helpful Member
#6
If you're using a pic then you can drive 4 with 8 pins. Connect between two pins and reverse the signal on each pin so you get 10V pk-to-pk signal. Or use an amplifier.

Mike.
 

audioguru

Well-Known Member
Most Helpful Member
#7
A piezo tweeter has a VERY rough frequency response that is full of resonances with no sounds in between. A response curve is heavily smoothed to make it look good but it still sounds awful.
A single transistor as an amplifier produces extreme distortion without having a lot of negative feedback and a piezo has no resistance so the transistor will still need a resistor as its DC load for it to do anything.
 

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Nigel Goodwin

Super Moderator
Most Helpful Member
#8
To be fair he's given us no idea what he's trying to do, so a single transistor 'might' be all that's required.

However, seeing as he specifed 'tweeters' (and lot's of them), rather than piezo beepers, I imagine he's wanting considerable power - so you couldn't bridge PIC pins to do it, neither enough voltage nor current.
 

AnalogKid

Well-Known Member
#9
Can anybody give us a shred of useful information?
What voltages are available for the circuit and the piezo devices?
What is the current required or power rating of the devices?
What is the operating frequency you want to deliver to the devices?
Piezo part number / manufacturer / datasheet / website ? ? ?

ak
 

audioguru

Well-Known Member
Most Helpful Member
#10
An audio power amplifier that can drive a 4 ohm load can drive 15 paralleled piezo tweeters up to 20kHz.

Piezo tweeters were used 50 years ago. I am surprized that they are still being sold as replacements. I found them at Parts Express at a very low price but with absolutely no audio spec's. Reviews say, "Not for hifi".
 

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Nigel Goodwin

Super Moderator
Most Helpful Member
#11
An audio power amplifier that can drive a 4 ohm load can drive 15 paralleled piezo tweeters up to 20kHz.

Piezo tweeters were used 50 years ago. I am surprized that they are still being sold as replacements. I found them at Parts Express at a very low price but with absolutely no audio spec's. Reviews say, "Not for hifi".
As always, you've overly critical, while not 'HiFi' they have been used in millions of PA and instrument cabinets over the decades, and perform perfectly acceptably in that role. In fact no doubt you have many recordings that feature such devices, you wouldn't know, as you can't tell.
 

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