This is the power step of the previous circuit. Output transistors must be mounted on good heat sinks. The circuit is from documentation from the 60s.
This circuit uses na Unijunction Transistor (UJT) to produce a modulation tone for several...
In the figure we have the suggestion of coupling an audio oscillator to monitor the CW...
This circuit is from the 80's and can be implemented with modern operational amplifiers equivalent...