This negative resistance circuit was obtained from a 1969’s American documentation. It can be made from modern components. See the characteristic obtained.
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...