Using the M1575 this switching converter was found in National Semiconductor documentation from the 90s. The circuit has a maximum output current of 1 A.
In the figure we have the adapter circuit for connecting a headphone to the output of a stereo...
Found in the June 1972 issue of Radio Electronics magazine, this circuit generates signals that...
The output of this circuit must be connected to the input of an audio amplifier. The microphone is a small...