Found in a 1964 General Electric documentation, this circuit uses PUTs that are not currently common components. By changing the capacitors, the frequency can be changed.
This circuit includes the power supply from the power grid. We found it in Radio Electronics from...
We found this circuit in a 2003 publication. The indicated coil is for capturing the signals in an...
This circuit is from a 1967 publication. The configuration holds true for modern transistors having...