Loublet Schematic

The cost of high grade, regulated power supplies has dropped with the advent of modern lCs......
For many applications the requirements are not that stringent and a simple, discretely constructed regulator as described here will suffice. With values as shown, the output voltage is 12V and the output current is limited to 0.5 A. For applications not requiring current limiting the circuit can supply up to 1 A. The current limiting components can then be left out. The relation between input voltage, load resistance and regulated output voltage is shown in table 1. This table cé`n therefore be used to determine whether the regulation for a particular application is sufficient. The heart ofthe regulator, high- power low-frequency transistor T1, must be fitted onto an adequate heatsink. FET T3 operates as a current source with an output maximum of 11...18 m/: this limits the base current of T1, of course, but the alternative would have been a very low value resistor this would have resulted in large current .

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