Found in RCA documentation from the 1960s, this 60 V regulator has a 100 V input and a current of 1 A. The transistors are from that time. One can try to use modern equivalents.
This oscillator with few components for frequencies that can reach 1 MHz was found in Radio...
Using an era germanium transistor, this 1960s circuit reverses the phase of relatively low...
We found this simple alarm circuit in a 1986 documentation. The circuit uses sensors of the NA...