This operational clamping circuit was found in an American documentation from the 1980s. The source must be symmetrical, and the waveforms of the signals are given next to the diagram.
With the name of transitube we find this MW receiver in documentation from the 50's. It uses a...
This circuit is from a 1998 Electronics Now and can be easily assembled since it uses a common...
This circuit is suggested by National Semiconductor and makes use of the negative regulator LM2990...