This circuit is suggested by American documentation from 1970. It makes use of transistors of the time but can be implemented with modern equivalent transistors.
This simple logic level tester was found in Radio Electronics from the 90s. The inverters are of...
The low-noise amplifier shown uses a rare Raytheon operational amplifier today. The circuit can be...
This circuit, found in American documentation, works as a voltage doubler, enabling the supply of a...