Piezoelectric sensors

How much does a pielectric sensor that can generate up to 1amp cost, I need it for a project to charge a battery(phone), though I have got 4 discs, each generating approximately 10mA making a total of roughly 40mA.

Secondly, is a piezoelectric sensor the same as piezoelectric diaphragm. 

Hi,

Have you tried checking digikey? http://www.digikey.com/product-search/en/sens...ration-sensors/1966393?k=piezo&pkeyword=piezo

Both of the devices exemplifies the piezoelectric effect.

A piezoelectric sensor is a device that uses the piezoelectric effect, to measure changes in pressure, acceleration, temperature, strain, or force by converting them to an electrical charge.- wikipedia

Two main groups of materials are used for piezoelectric sensors: piezoelectric ceramics and single crystal materials.

Piezoelectric Diaphragms are piezoelectric ceramic disks adhered to a metal plates of brass or nickel-alloy.

We can say that the piezoelectric diaphragm is a transducer and not a sensor..

Thanks alot