This circuit from a 1970s General Electric publication applies to motors of the series winding type. SCRs support current equivalents and must be equipped with heat sinks.
This circuit was found in documentation from Analog Devices from the 90s. The circuit uses...
This simple transistor tester uses a common 3 mA analog instrument that has its scale changed as...
Found in European documentation from the 1980s, this circuit was originally designed for computer...