Nx Audio Rx — 4000 Circuit Diagram

NX Audio RX 4000 is a professional-grade, two-channel power amplifier widely used in DJ setups, live sound, and PA systems for its high reliability and ability to operate under low voltage conditions [13]. Circuit Overview & Architecture

The NX Audio RX 4000 is a professional-grade Class AB power amplifier widely used in live sound, DJ setups, and large-scale PA systems. Known for its "workhorse" reliability, it is specifically designed to operate stably even in demanding environments with low voltage or uneven power frequencies. Circuit Overview and Architecture nx audio rx 4000 circuit diagram

• PWM Controller: Typically an SG3525 or TL494 IC. This chip generates the square waves that drive the switching transistors.
• Switching Transistors: Usually 4 to 8 pieces of IRFZ44N or IRF3205 in parallel.
• Transformer: The ferrite toroidal coil steps up 12V to ±45V to ±60V DC.
• Rectification: High-speed diodes (e.g., MUR1620 or BYV28) arranged in a full-bridge configuration.

Preamplifier / Input Buffer

4. Feedback & Stability: A feedback loop runs from the speaker output back to the input differential pair to set the gain and linearize the frequency response. A "Zobel Network" (Resistor + Capacitor in series) is placed across the output terminals to stabilize the amp against reactive speaker loads. NX Audio RX 4000 is a professional-grade, two-channel

• Input Stage: The input stage includes the input connectors, input buffers, and gain-setting resistors. The input buffers provide a high-impedance input to the amplifier, while the gain-setting resistors set the amplifier's gain.
• Pre-Driver Stage: The pre-driver stage includes transistors and resistors that amplify the input signal and provide a drive signal to the power transistors.
• Power Stage: The power stage includes the power transistors, emitter resistors, and output connectors. The power transistors amplify the drive signal to produce a high-power output signal.

Step 4: Understand the Power-Up Sequence

The diagram will show a mute delay circuit using a transistor and an RC network. This prevents the "thump" at startup. If you hear a thump but no music, your delay relay (if present) or the muting transistor is faulty. PWM Controller: Typically an SG3525 or TL494 IC

Circuit Diagram Overview