With cheap and easily available chips that perform this exact job, it might seem a little loopy to throw 20 LM324 op-amps at the job. But as [gschmidt958] explains, this is strictly for the ...

He does this by using a standard electret microphone, half of an LM324 op amp, a voltage comparator and a PIC micro controller. The operation of the device is as simple as its wiring, the ...

Delivering many improved major specs over traditional LM324 op-amps, but with rail-to-rail inputs and outputs, STMicroelectronics has introduced a 6MHz all-rounder op-amp family that will operate from ...