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.
In this circuit we have the way to use two transistors as a regenerative pair simulating an SCR....
This circuit simulates a UJT, with two bipolar transistor. Frequency is given by C1 and P1...
Found in Popular Electronics from 1969, this circuit uses a neon lamp from the time that had...