This bidirectional circuit was found in an American documentation from the 80's. The LEDs are common red, and the resistor is calculated according to the formulas next to the diagram.
This circuit can operate with signals up to 60 MHz using the indicated operational. We found it in...
National Semiconductor suggests the figure circuit for stabilizing the peak value of an...
We found this circuit in a 1980 documentation. With basic changes, including transistors that were...