Diagrama esquemático de la fuente simétrica regulable.

Los componentes son muy fáciles de conseguir.

• T1 Transformador que puede tener un primario de 110 o 220 voltios alternos a 60 Hertz, el secundario puede cambiar según las necesidades de los voltajes directos a la salida, que pueden oscilar entre 4,5 a 40 voltios alternos, su corriente puede ser de 1 a 15 amperios, como uno quiera.
• Los diodos son de 3 o más amperios o puente rectificador.
• C1 Un condensador electrolítico de 2500 microfaradios a 50 voltios.
• C2 Un condensador electrolítico de 470 microfaradios a 50 voltios
• Dos transistores 2SC458 ECG 85.
• Transistor 2N3055 ECG 152.
• Transistor TIP 121.
• Transistor TIP 126.
• C1-1 Circuito integrado LM741.
• D1 D2 Dos diodos 1N4148.
• Diodo zener de 3voltios medio vatio.
• C3 Condensador electrolítico 100 microfaradios a 50 voltios.
• C4 Condensador electrolítico 47 microfaradios a 50 voltios.
• R1 470Ω o 1KΩ.
• R2 100Ω.
• R3 Potenciómetro de 5K Ω ojala lineal.
• R4 12KΩ.
• R5 12KΩ.
• R6 12KΩ.
• R7 5,6KΩ.
• R8 5,6KΩ  todas las resistencias a medio vatio.

Circuito impreso ya montado (apariencia en ordenador).

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