In the figure we have the configuration of a voltage regulator with 3 transistors. The components depend on the desired voltage and current as well as on the characteristics of the transistors.
We found this circuit in an old American documentation. The table gives the values of the...
This circuit, from a 1978 publication, uses a germanium power PNP, but the BD135 can be used for 6...
This water-triggered relay circuit was found in a Radio Electronics from May 1959. The circuit has only...