This circuit from a Radio Electronics from October 1965 shows how to obtain the action of an SCR when triggering a relay using two transistors. The relay is according to the circuit supply voltage.
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...