Using transistors at the time, this circuit was found in a 1970s documentation. Transistors support modern equivalents for 2A currents at least in the case of the output transistors.
In the figure we have an interesting possibility that consists of the activation of a heating...
This circuit was found in a 1980s telecommunications publication. The circuit uses a diode bridge to...
This simple alarm was found in a 1982 documentation, but uses components that are still common,...