This very complex circuit in terms of the number of transistors was found in Radio Electronics from March 1966. The circuit is for low impedance headphones. The transistors are from the time.
We found this simple shortwave receiver in an Electronics Now from the 1990s. Details of the coil...
We found this circuit in a 90's European schematic. The circuit can be implemented with almost any...
In figure 1 we have an application for NLAS5113, a new device from on Semiconductor...