This circuit reverses the signal if both positive and negative. We found it in an American documentation from 1969.
This circuit is from a Popular Electronics from 1992. It uses two SCRs and can be triggered by...
This circuit is from a 1965 Motorola documentation. The transistors are of the time as is the...
This circuit was found in the 2005 Linear Technology Linear Circuit Manual. It is a sensor with large...