Driving a piezo sounder

[Martin Griffith]

What is the best way to drive this sounder
http://www.farnell.com/datasheets/75458.pdf

I don't have one to play with at the moment, but the data sheet says
it has 18000pF capacitance.

I'll be driving it from a 8051 port pin, 5v available. I suppose a
push pull arrangement would be best


martin

 

[Silvar Beitel]

What is the best way to drive this sounderhttp://www.farnell.com/datasheets/75458.pdf

I don't have one to play with at the moment, but the data sheet says
it has 18000pF capacitance.

I'll be driving it from a 8051 port pin, 5v available. I suppose a
push pull arrangement would be best

martin

You may find this useful:

http://www.murata.com/catalog/p15e6.pdf

If you drive it directly from a chip, pay attention to their warnings
about protection. The damn things do work backwards (convert
mechanical energy into electrical) as well as forwards! (I found this
out the hard way many many years ago.)

 

[Martin Griffith]

You may find this useful:

http://www.murata.com/catalog/p15e6.pdf

If you drive it directly from a chip, pay attention to their warnings
about protection. The damn things do work backwards (convert
mechanical energy into electrical) as well as forwards! (I found this
out the hard way many many years ago.)

thanks, very useful


martin

 

[MooseFET]

What is the best way to drive this sounderhttp://www.farnell.com/datasheets/75458.pdf

I don't have one to play with at the moment, but the data sheet says
it has 18000pF capacitance.

I'll be driving it from a 8051 port pin, 5v available. I suppose a
push pull arrangement would be best

A protected push pull driver is the way to go. In the past I have
found that a small inductance in series with the sounder helps the
efficiency of making noise. It cuts down the peak of the current when
the edge happens and spreads it out in time.