This circuit uses an unusual operational amplifier nowadays and has a very low consumption. The number in parentheses corresponds to the second channel, for a stereo version.
This circuit was found in a 1987 magazine. It measures monitors the heartbeat through a...
The ESDZ series of protection diodes from STMicroelectronics can be purchased from Mouser...
This circuit was obtained from General Electric documentation from the 1980s. FET operations are from...