The Mains Voltage (230 V) is transformed down to 15 V with a 150 W Transformer from Farnell. (#1675077, MULTICOMP VTX-146-160-115). Rectification is done by a GBPC2510, (Farnell, #1621698). Afterwards, a bank of 11 Capacitors of 2200 µF, 35 V smoothes the rectified ac voltage. Now a LM723 regulates the Output Voltage using a driver of either a BC141/16 OR a BD135 and Four Pass Transistors (TIP 3055). In order to symmetrise the currents through the Pass Transistors, an Emitter Resitor of 0.12 Ω is added in series. It ist from Distrelec (#722701). Afterwards, a Current Sensing Resistor (Consisting of two times 0.15 Ω, Distrelec #722702, in parallel) is added.

Connect a Voltmeter at the Output and adjust Output Voltge using R₁₁ to 13.8 V.

Fig. 1 : U/I Characteristic Curve




Fig. 2 : Step Response. U_out = 13.8 V, I is changed from I₁ = 1 A to I₂ = 3 A.




Fig. 3 : Long Term Stability. U_out = 13.8 V, I = 3 A.

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