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 uses a phototransistor as sensor. The changes in the resistance of the transistor,...
This circuit is from Texas Instruments' own datasheet for this low voltage operational amplifier. The...
This circuit can measure audio output power up to 50 W. The circuit is wired to the output of an...