These circuits were obtained in an Electronics Now from the 90s. The integrated circuits are from that time and the power can be between 1.5 and 2 V.
Found in a 1965 Radio Shack documentation this oscillator can be used with modern general purpose...
In the figure we have a voltage / frequency converter circuit that can be used as a transducer interface...
This small stereo amplifier for headphones was found in a documentation on integrated circuits from...