This circuit is from the 1968 ARLL documentation. The MOSFET admits equivalent and the coil determines the operating frequency range being the plug type.
E) This circuit uses a reversible double contact relay to obtain the trigger lock with the...
We found this circuit in a 1964 Electronic Design. Transistors can be modern general-purpose...
This circuit was found in a 1979 magazine. We can use any JFET like MPF102 or BF245. The relay is 12 V...