This circuit was found in a 1965 General Electric documentation. SCRs and unijunction may be current equivalents. The circuit has period adjustment and symmetry.
This metal detector was found in a 2001 Poptronics, but it can still be easily assembled, as the...
The inversion of the switching action, with the output going high when the input is low, can be...
The circuit shown in the figure is indicated for alternative energy sources, such as those...