I am using the arduino to generate sounds for a piezo element. When i directly connect the Peizo to the IO I get sounds. But when i try and run it through a known functioning op-amp circuit I get nothing. I just want to boost the sound to the piezo to make it louder. What am I doing wrong?
It has worked before and I used it as an amp for a cable toner at work. I used an 8 ohm speaker for that.
I would prefer to make a new amp circuit. I just can't seem to figure out how to amplify the sound to the piezo element. I currently have about 10 lm324 IC's and if i could use that it would be amazing.
The other op amp IC I was using before was an lm328.
It has worked before and I used it as an amp for a cable toner at work
If it has worked before then it is not working now.
So why?
Have you wired it up wrong? - we don't know because you haven't posted the circuit.
Have you got the power supply right - we don't know because you haven't posted the circuit.
Have you got the output connected correctly - we don't know because you haven't posted the circuit.
See a theme developing?
I just used the one from the datasheet.
With the input from the arduino. I have never gotten it to work from the arduino.
Try connecting the input to the arduino through a capacitor, start off with 1uF.
If that doesn't work then connect pin 2 not to ground but to two 1K resistors, the other ends to go to ground and +5v
Thanks 
I will try it as soon as I get home.
Is there a way I can use this chip? I am still learning about OP AMPS and am sure you will laugh at this. Am I missing something? What are the basic requirements for using an OP AMP chip?
Thank you for your help!
The chip pictured is an LM324.
I got the other chip to work after trying what Grumpy_Mike suggested. But it wasn't very loud. Is this because of the battery i have connected up to the chip? The LM386 has a gain capacitor connection. I currently have a 1000uF cap there. Should I change that?
So using transducers with this setup is a dead end? I am not sure how practical it would be to kick up the voltage.
Thanks for your help.