This circuit was obtained from Elektor magazine and published in the Encyclopedia of Electronic Circuits Vol 5 of 1995. Transistors are RF types that are still common today.
This automatic switch for multiple loads was shown in the May 1983 issue of Radio Electronics...
Found in a Popular Electronics from the 90s, this circuit is suitable for testing and tuning...
This configuration is used to display the characteristic curve of a diode in the virtual...