E)
This soft start dimmer was found in a Motorola documentation from 1968. However, it can be implemented with modern equivalent components like the 2N2646 for the Unijunction.
This circuit is from an English book from the 1980s. Transistors can be general-purpose types of...
This circuit from the 80's can be easily implemented but needs some changes to avoid problems with...
The presented circuit provides an output voltage proportional to the input current, according to...