signal conditioner

[[email protected]]

Hi guys,

Iam trying to find a design for a conditioning amplifier "signal
conditioner" to be used with a piezoelectric accelerometer. I need a
gain of 20 dB and also need a BandPass Filter between 1KHz to 10-KHz.
The signal has a low amplitude of millivolts. I need the signal
conditioner to power the accelerometer.

Here is the specs for the accelerometer:

http://www.pcb.com/contentstore/docs/PCB_Corporate/Vibration/products/specsheets/352B_B.pdf

and here is the specs for the signal conditioner that works with it (I
need to design something like this myself ):

http://www.pcb.com/contentstore/docs/PCB_Corporate/Electronics/products/specsheets/480E09_M.pdf

This is what happens when you let a girl design electronics

I would really appreciate your help guys!

 

[Spehro Pefhany]

Hi guys,

Iam trying to find a design for a conditioning amplifier "signal
conditioner" to be used with a piezoelectric accelerometer. I need a
gain of 20 dB and also need a BandPass Filter between 1KHz to 10-KHz.
The signal has a low amplitude of millivolts. I need the signal
conditioner to power the accelerometer.

Here is the specs for the accelerometer:

http://www.pcb.com/contentstore/docs/PCB_Corporate/Vibration/products/specsheets/352B_B.pdf

and here is the specs for the signal conditioner that works with it (I
need to design something like this myself ):

Have you looked at the application notes? This part already has an
amplifier inside; the hard work is already done for you.

http://www.pcb.com/techsupport/tech_signal.php

http://www.pcb.com/contentstore/docs/PCB_Corporate/Electronics/products/specsheets/480E09_M.pdf

This is what happens when you let a girl design electronics

What is it, some kind of fully-instrumented vibrator?

I would really appreciate your help guys!

Best regards,
Spehro Pefhany

 

[John Larkin]

What is it, some kind of fully-instrumented vibrator?

Tasteless. Why does somebody always say something offensive whenever a
woman posts here?

John

 

[DaveC]

What is it, some kind of fully-instrumented vibrator?

If the OP was a guy, would you ask the same question?

 

[[email protected]]

Hi guys,

Iam trying to find a design for a conditioning amplifier "signal
conditioner" to be used with a piezoelectric accelerometer. I need a
gain of 20 dB and also need a BandPass Filter between 1KHz to 10-KHz.
The signal has a low amplitude of millivolts. I need the signal
conditioner to power the accelerometer.

Here is the specs for the accelerometer:

http://www.pcb.com/contentstore/docs/PCB_Corporate/Vibration/products...

and here is the specs for the signal conditioner that works with it (I
need to design something like this myself ):

http://www.pcb.com/contentstore/docs/PCB_Corporate/Electronics/produc...

This is what happens when you let a girl design electronics

I would really appreciate your help guys!

This looks like fun. First off, you need to feed the sensor with a
current source. In the app note, they use a current regulated diode,
which is really a JFET. In this case, the IDSS has to be less than
20ma. You could also design a current source using a PNP or P-fet
This sensor has some decent high frequency respoinse, i.e. 15KHz. At
best, the time constant associated with the 500ohm output impedance of
the sensor and the load capacitance of the current source should be
around 3uS., or 20nF. [Hey, I'm just whipping this stuff together, so
check the math.] Any capacitance in the cable has to be subtracted, as
well as loading capacitance of the amplifier.

Since the charge amp is built into the sensor, all you would require
besides the current source is some AC coupled amplifier, or DC coupled
with a servo. The impedance of the amplifier (probably just an op amp
in the negative gain configuration) and the coupling cap determine the
low end response.

 

[Spehro Pefhany]

Tasteless. Why does somebody always say something offensive whenever a
woman posts here?

John

You don't think that's what was intended in the original post?


Best regards,
Spehro Pefhany

 

[Spehro Pefhany]

If the OP was a guy, would you ask the same question?

Possibly, I've been spending a *lot* of time around college kids the
last little while.

Here's *my* fully instrumented vibrator (also designed the actuator
electronics):

http://server2.hostingplex.com/~zstoretr/vib.jpg

The only thing tasteless about it (and it's pretty tasteless) is that
the product it produced was designed to produce is used to
deliberately kill people.


Best regards,
Spehro Pefhany

 

[joseph2k]

You don't think that's what was intended in the original post?


Best regards,
Spehro Pefhany

Speaking strictly for myself, NO, not at all. If you had even brushed up
against vibration or shock testing you could know better. I will read the
rest of the thread before i answer OP.

 

[joseph2k]

Hi guys,

Iam trying to find a design for a conditioning amplifier "signal
conditioner" to be used with a piezoelectric accelerometer. I need a
gain of 20 dB and also need a BandPass Filter between 1KHz to 10-KHz.
The signal has a low amplitude of millivolts. I need the signal
conditioner to power the accelerometer.

Here is the specs for the accelerometer:

http://www.pcb.com/contentstore/docs/PCB_Corporate/Vibration/products/specsheets/352B_B.pdf

and here is the specs for the signal conditioner that works with it (I
need to design something like this myself ):

http://www.pcb.com/contentstore/docs/PCB_Corporate/Electronics/products/specsheets/480E09_M.pdf

This is what happens when you let a girl design electronics

I would really appreciate your help guys!

I doubt that the sensor is piezoelectric, the specs read like a partially
conditioned MEMS sensor. Proper piezoelectrics output dimensions is in
picocolumbs per g.