How to audio drive a 300 ohm flat piezo speaker ?

M

Miro2424

New Member

• Aug 13, 2011

• #1

Please advise how to drive the following piezo speaker;

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=668-1209-ND

I would like to use the handy LM386 audio amp. How to wire the ic output to piezo?

The piezo speaker data sheet as follows;
Impedance: 300 ohm
Input voltage : 3vrms
Max input voltage: 20 p-p
Min output: 75 dba
Freq. range: 300-20,000hz

 

Externet

Well-Known Member

• Aug 13, 2011

• #2

Device takes less than 20 V pp; so use an amplifier with about 15 volts rail supply; I think the LM386 IC can do it, connect as if it was any plain speaker per IC data sheet.

 

alec_t

Well-Known Member

Most Helpful Member

• Aug 14, 2011

• #3

Check the datasheet to make sure that the 386 is happy (unconditionally stable) driving a capacitive load such as a piezo speaker.

 

4pyros

Well-Known Member

Most Helpful Member

• Aug 14, 2011

• #4

I can not find much info on driving a 300 ohm load like a headphone with a LM386.
Has anyone seen anything?

 

Sceadwian

Banned

• Aug 14, 2011

• #5

Sounds like crap, but I think this video pretty much says the LM386 will work, don't know about 'unconditionally stable' but functional at least.

 

audioguru

Well-Known Member

Most Helpful Member

• Aug 14, 2011

• #6

What sounds will the horrible-sounding piezo transducer play?
Its loudness is very low and since it resonates at 1800Hz then it will not produce low frequencies.
It might produce faint childrens' voices pretty well.