Brilliant modern app note for venerable LM324, and friends The LM324 low-voltage quad op-amp is decades-old design that it refuses to die – because it subtler characteristics are just so useful.

This pulse oximeter is so simple and cheap to build it’s almost criminal. The most obvious way to monitor the output of the sensor is to use an oscilloscope. The poor-man’s stand-in for… ...

Delivering many improved major specs over traditional LM324 op-amps, but with rail-to-rail inputs and outputs, STMicroelectronics has introduced a 6MHz ...