Circuit Audio Power Amplifier with Subwoofer – Mount Bridge – Using Ne5532 and 4 TDA2030 – 2 x 18 Watts stereo + 30 W sub

This circuit is typical of systems sold for 2.1 PC surround systems, left and right channel and subwoofer. Just plugging in the stereo audio and adjust the volume
Audio amplifier circuit using integrated TDA2030 and op amp Ne5532, has two stereo amplifier left and right satellite and Bass amplifier using TDA2030 in bridge for more power. The filter is made by double operational amplifier Ne5532. Complete assembly with the suggestion of the printed circuit board and has a power supply coupled to the circuit.


This circuit is a remake of another already posted on the Blog, but with some changes, uses two TDA ic’s in bridge to the subwoofer amp, with a new board design with some improvements. The idea is that to achieve maximum 18Watts satellites and the outputs 32 watts in Subwoofer … This power with a maximum of + -18 Volts Speakers and 4Ω. The circuit has adjustable volume for the stereo and subwoofer. Use pots of good quality to make this work.
By making the assembly check all connections and all components are correctly positioned, and the orientation of the pcb, be mounted inverted not seen it work, the components have to be positioned as illustrated above. When mounting make sure that the pin 7812 is different from 7912. Use a good heat sink to the TDA IC’s.

The power supply  is already fixed in the pcb and simply add the transformer, to be with center tap on the secondary and primary according to the network (110/220). The capacitors can be supply of the  4700μF at 10000μF, the resistors are in parallel to discharge these capacitors Great. Always use good quality components in its assembly.
The appropriate transformer to the circuit, according to my withdrawal must be at least 4.5 A transformer or to the 55VA 12-0-12 Volts, to be about-16V +.

Schematic 2.1 audio Amplifier with TDA2030 in bridge (small size)

Suggested Printed Circuit Board 2.1 audio amplifier with Subwoofer Amplifier (small size)

PCB Copper side

Silk scren PCB

R1, R11, R22, R24 470 – Yellow, Violet, Brown, Gold R13, R16, R26 22K – Red, Red, Orange, Gold R2, R7, 22K 2 Watts – Red, Red, Orange, Gold R3, R12, R23 33K – Orange, Orange, Orange, Gold R4, R5, R14, R25 4.7K – Yellow, Violet, Red, Gold R6, R10, R15, R18, R21, R29 10 – Brown, Black, Black, Gold R8, R9, R17, R19, R20, R27, R28 10K – Brown, Black, Orange, Gold

C1, C4 10µF/25v – Polarized Electrolytic Capacitor C2, C7 10000µF/35v* – Polarized Electrolytic Capacitor C3, C8 1µF/250V – Polyester Film Capacitor C5, C10, C13, C15, C17, C19, C22, C23, C24, C28 100n/ 100V- Polyester Film Capacitor C6, C16, 2n2/100V – Polyester Film Capacitor C9, C11, C12, C14, C18, C21, C25, C26 10µF/25v – Polyester Film Capacitor C20 47µF/25v – Polyester Film Capacitor C27 220n/100V – Polyester Film Capacitor

IC1 7912T – Negative Voltage Regulator -12V. Any prefix (LM, NS, KA, etc.). IC2, IC4, IC5, IC7 TDA2030V – Audio amplifier integrated circuit IC3 7812T – Positive Voltage Regulator +12 V Any prefix (LM, NS, KA, etc.). IC6 NE5532N – Integrated Circuit Dual Operational Amplifier B1 KBU8B – 100V 8A bridge rectifier or equivalent. LED1 LED 3 or 5 mm any color

R-IN 2 Terminals Connector left channel audio input R-OUT 2 Terminals Connector right channel audio output L-IN 2 Terminals Connector left channel audio input L-OUT 2 Terminals Connector left channel audio output SUB 2 Terminals Connector Subwoofer audio output AC 3Terminals Connector to the transformer

J1, J2, J3. J5, J6, J7, J9 J12MM – Piece of wire 12mm J4 J5MM -Piece of wire 5mm J8 J7MM – Piece of wire 7mm P1 10k – Double logarithmic pot, Main Volume Adjustment P2 10k – Logarithmic pot, adjust the subwoofer volume Soldering, transformer 12 +12 / 4 Amps (50 Va), Wire, Box for Amplifier, PCB, heat sink for the IC TDA, etc..