In circuit presented below, is used very few elements, power supply and will therefore be easy to manufacture. Serial power transistor will be as well known and popular 2N3055, but the power supply voltage and current regulation. Source voltage is 24V AC transformer.
Output voltage is adjustable with potensiometer P2 (10K), current limit is adjustable with P1 (500 ohm, 470 ohm can be). Current restrictions on the use of R5 resistance (0.15 ohm) in the value of the current maximum output of around 3.5 Ampere. Resistor R5 is 2.5 Ampere output current 0.22 ohm, for greater output current, the resistance R5 lower. For a good start would be to draw up a power supply from 0.22 ohm, then trying to find an appropriate maximum output current by changing the resistors.
An output power of the simple, it is used only one output transistor. Scene exit 723 is made with the PNP transistors Q1 medium power, the proposed BD712 or BD912, but will instead proposed fine also like transistors, which passed at least 2 Ampere flow and have allowed disipacijo at least 20W and a maximum voltage of at least 40 Volt. Outlet power transistor Q2 is 2N3055 or stronger.
In order to facilitate the assembly of the output transistors Q2 2N3055, which is in TO3 housing, I prepared a special template in the form of printed circuit boards.
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