Hi,
I know the basic way the circuit should work, but I'm not very familiar with all the components out there. (So many!)
Basically, I'm trying to have an LED turn on whenever a vibration sensor (piezoelectric film) produces a voltage, however I don't just want it to be a simple on/off function. I want the LED's brightness to depend on how hard the sensor is struck, or rather, depending on the voltage output of the sensor. Obviously the sensor can't drive the LED itself, so I was thinking I need an OP amp of some sort, but I can't seem to find the right one for the job. Does a transconductance amplifier sound right? The only ones of those I could find didn't seem to support enough current that I need... I'm planning on using a high brightness LED that could draw anywhere from 200-500mA. Besides that, I'm not sure what I could possibly use.
I know the basic way the circuit should work, but I'm not very familiar with all the components out there. (So many!)
Basically, I'm trying to have an LED turn on whenever a vibration sensor (piezoelectric film) produces a voltage, however I don't just want it to be a simple on/off function. I want the LED's brightness to depend on how hard the sensor is struck, or rather, depending on the voltage output of the sensor. Obviously the sensor can't drive the LED itself, so I was thinking I need an OP amp of some sort, but I can't seem to find the right one for the job. Does a transconductance amplifier sound right? The only ones of those I could find didn't seem to support enough current that I need... I'm planning on using a high brightness LED that could draw anywhere from 200-500mA. Besides that, I'm not sure what I could possibly use.
Last edited: