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.
This circuit can be implemented with other operational ones. We found it in documentation from the...
This beacon causes an LED to flash with the mains voltage. The frequency depends on the capacitor. For...
This circuit was found in a Poptronics of the 90's. The circuit limits the load current to 0.6 A....