This circuit was found in an Electronics World of 1968, making use of components of the time, not common today. The power supply is not provided.
With this circuit it is possible to accelerate the discharge of a capacitor in a unijunction...
This circuit was found in a Poptronics of the 90's. The circuit limits the load current to 0.6 A....
The circuit presented is from the 1993 Motorola Linear Interface ICs. Other operational may be...