We found this circuit in a 1965 Electronic Design. Transistors are still common but admit equivalents for some of them. The circuit drains a current of only 4 mA.
This 1967 General Electric circuit makes use of an array of 3 (integrated) transistors for an...
We found this circuit in an ancient American documentation. It can be adapted to operate in other...
This oscillator uses a ceramic resonator to determine the frequency. This kind of element is found...