Found in a 1965 Radio Shack documentation this oscillator can be used with modern general purpose transistors like the BC558. The transformer is the output type for transistor radios.
This circuit was obtained in an 1975 English publication. It is a voltage regulator circuit for...
We found this high input impedance, low output impedance amplification stage in the October 1993...
We found this circuit in an old publication on oscilloscopes. Its purpose is to observe the Ie /...