Symmetrical regulated power supply and variable 0 to 30V 2A

Symmetrical regulated power supply schematicThis Symmetrical regulated power supply and variable power supply 0 to 30V 2A circuit does not require further explanation, which is a controlled variable symmetric source, can deliver up to 15V per line (-15 and +15), or up to 30V as a whole, for the consumption of up to 2A, but with some changes could be modified to provide up to 5A ** (or more). Transistors Q1 and Q2 should be installed on a heat sink, as well as integrated LM337 and T LM317 which is in the TO-220 package.

List of Symmetrical regulated power supply components:
T1 – Transformer suitable for primary power supply (110 or 220V) and secondary 15 +15 to 2A. **
IC1 – LM317 Integrated Circuit (ECG956)
IC2 – Integrated Circuit LM337T (ECG957)
Q1 – Transistor TIP3055
Q2 – Transistor TIP2955
Q3 – Transistor BC548 or similar
Q4 – Transistor BC558 or similar
D1 to D4 – 1N5804 or similar diodes. **
D5 and D6 – LEDs
C1 and C2 – Electrolytic Capacitors 4700uF 35V **
C3 to C6 – 0.1uF capacitors (100nF) 50V
R1 and R2 – 1000 ohms 1/2W resistors
R3 and R4 – 220 ohms 1/2W resistors
R5 and R6 – 0.5 ohm 5W resistors **
R7 and R8 – resistances of 470 ohms 1/2W
P1 and P2 – Potentiometers of 5000 ohms

5A ** Modifications for:
T1 – Transformer suitable for primary power supply (110 or 220V) and secondary 15 +15 to 5A.
D1 to D4 – 1N5809 or similar diodes.
C1 and C2 – Electrolytic Capacitors 35V 10000uF
R5 and R6 – 0.22 ohm 10W resistors

Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.


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  1. author

    thy sokkhy4 years ago

    i want you help me how to charge bicycle battery system DC 24v from AC 220v

  2. author

    Nikos Sapountzakis4 years ago

    hello gentlemen.
    I am interested for this supply.
    Do you have the pcb?
    Where can i buy it?

    thank you.

  3. La fuente de alimentación | Misintemodular2 years ago

    […] y podemos encontrar en internet miles de esquemas de fuentes de alimentación, como por ejemplo la de este enlace. Si somos un poquito mañosos podremos comprar los componentes y montarla nosotros mismos. Es la […]

  4. author

    ELi Xain2 years ago

    Hi… I need Pcb software and Stimulator which is used by you! in this project??
    Please! Help me…