Headphone Amplifier

High Quality unit with LM833 or NE5532 Low noise Dual Op-amp. No need for a preamplifier. Can be directly connected to CD players, tuners and tape recorders. Tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000 Ohm. Old 8 Ohm impedance headphones can be also driven, but these obsolete devices are not recommended. Schematic shows left channel and power supply (common to both channels). Numbers in parentheses show IC1 right channel pin connections. More: A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of J1, P1, C2, C3 & C4. Then connect separately the input and output grounds to the power supply ground. Technical data:

The described unit utilizes either the LM833 or NE5532 low-noise dual operational amplifiers, which are recognized for their high-quality audio performance and low distortion characteristics. These op-amps are configured to eliminate the need for a preamplifier, allowing for direct connections to audio sources such as CD players, tuners, and tape recorders.

The circuit is designed to accommodate a wide range of headphone impedances, tested with models ranging from 32 ohms to 2000 ohms. It is capable of driving older 8-ohm headphones, although their use is not recommended due to their obsolescence. The schematic representation includes the left channel configuration as well as the common power supply for both channels, ensuring consistent performance across the audio spectrum.

Pin connections for the right channel are indicated in parentheses next to the integrated circuit (IC1) designations, providing clarity for assembly and troubleshooting purposes.

Grounding is a critical aspect of this design, as it plays a vital role in minimizing hum and preventing ground loops. It is recommended that the ground connections for various components, specifically J1, P1, C2, C3, and C4, be tied to a single grounding point. Input and output grounds should be connected separately to the power supply ground to further mitigate noise issues.

This circuit design exemplifies a straightforward yet effective approach to high-fidelity audio amplification, suitable for enthusiasts seeking quality sound reproduction without the complexities associated with more elaborate systems.High Quality unit with LM833 or NE5532 Low noise Dual Op-amp. No need for a preamplifier. # Can be directly connected to CD players, tuners and tape recorders. # Tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000 Ohm. # Old 8 Ohm impedance headphones can be also driven, but these obsolete devices are not recommended. # Schematic shows left channel and power supply (common to both channels). # Numbers in parentheses show IC1 right channel pin connections. * A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of J1, P1, C2, C3 & C4. Then connect separately the input and output grounds to the power supply ground. Technical data: Output vo 🔗 External reference