Found in a 1990s American documentation, this circuit provides an output voltage approximately 4 times that of the input voltage. Diodes are general-purpose types.
This circuit, found in a 1958 magazine, is for reference only, since the components are not easy...
Found in Popular Electronics this circuit triggers an SCR and lights an LED when the location of...
This OF-1 LO oscillator was found in a 1980s American documentation. The transistor can be any...