In the figure we have two circuits of limiters that provide the cut of the negative peaks of a signal. The circuit is from an 80's telecom documentation being adaptable on common receivers.
This small power source from a 1970s publication uses a germanium transistor. We can use a silicon...
With this configuration it is possible to obtain an 80 dB gain from two 741 operational...
Being able to function as a shield, this amplifier was found in documentation from the 70s....