No information is given on the transformer in this circuit that we found in an American 1967 documentation. The power transistors are of the time and mounted on a plug-in module.
The figure shows how to implement an alarm buzzer in an LM3914 to warn about crossing the scale...
This circuit can act as a shield being controlled by a microcontroller by pin 1 or 2. The...
This circuit was obtained from a 1980's QST magazine. The circuit can generate 1 to 15 MHz signals...