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Piezo-Ceramic Charge Amplifier

Former Member

Hi Guys,

 

I am in need of a tiny simple charge amplifier to amplify a charge created from a piezo-ceramic and convert it into voltage.

I am using the piezo-ceramic as tiny detector for when applying force, thus I am in need of a charge amplifier.

Where can I find the schematic for one ? and who can create one for me ? can I batch PCB ?

 

Kind regards,

Pulicaverde 

Parents Reply
  • 0 in reply to Latch

    Don't be tempted by the transistor circuit, even with a big piezo sensor with 47nF capacity it has  a low frequency cut off frequency at 67Hz with the 100k pot at mid point and RM at max but the LF cut off frequency will get higher if the 100k pot is adjusted in either direction and is indeterminate (depends on transistor gain) as RM pot is reduced.

     

    The LTC6240 ciruit would work but uses rather extreme component values - unless you are experienced at designing and building high impedance circuits you will have problems with a 1G ohm feedback resistor.

     

    More details about your problem would help.

     

    Michael Kellett

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