for a 5v rail voltage, best to use a TL062 or other low voltage op amp, or even better a rail-to-rail op amp (sorry, can't think of the number for one right away). try searching the TI, Analog Devices, or National Semiconductors websites for "rail to rail op amp" or "low voltage op amp"
Are you sure about that 3mv input level? That is really small, and you will have to worry about outside noise. What is your source that only produces 3mv?
piezo transducers have much higher source impedance than 500 ohms, and the input bias current of an LM324 is high, and it's not a rail-to rail op amp. a TL062 would have been a better choice because of the lower input bias current. although an LM324 will work at 5V, i suspect you will be "underwhelmed" with the results
piezo transducers have much higher source impedance than 500 ohms, and the input bias current of an LM324 is high, and it's not a rail-to rail op amp. a TL062 would have been a better choice because of the lower input bias current. although an LM324 will work at 5V, i suspect you will be "underwhelmed" with the results
I think you're rather missing the point?, it's to get a trigger from a drum pad to connect to a drum machine, the 324 is perfectly suited to the job, and the edrum has been made in fairly large numbers. It's a tried and tested design.