This unijunction transistor circuit was found in Radio Electronics magazine from July 1968. The circuit operates up to approximately 100 kHz depending on C1.
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...