Headphone Amplifier
The described circuit is designed for audio applications, allowing direct connection to various sources such as CD players, tuners, and tape recorders. The circuit has been tested with a range of headphone impedances, demonstrating compatibility with loads of 32, 100, 245, 300, 600, and 2000 Ohms. The schematic provided focuses on the left audio channel, indicating that the right channel shares common components for a balanced stereo output.
Key components include B1 (the power supply), SW1 (a switch for power control), J1 (the headphone jack), and C3 (a coupling capacitor), which are utilized in both channels. The design includes a resistor, R3, whose value is critical for ensuring optimal performance with different headphone impedances. For headphones with an impedance of up to 300 Ohms, the resistor value has been appropriately calculated. However, for higher impedance headphones, specifically those rated at 600 Ohms or more, it is recommended to adjust the value of R3 to 100K Ohms to maintain audio fidelity and prevent distortion.
This circuit may also benefit from modifications or upgrades, as indicated by suggestions from users such as Mike Baum. Such enhancements could lead to improved performance characteristics, making the design adaptable for various audio applications. Overall, the circuit's straightforward design and component selection facilitate a reliable and effective solution for connecting headphones to audio sources.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. Schematic shows left channel only. # B1, SW1, J1 & C3 are common to both channels. # R3 value was calculated for headphone impedance up to 300 Ohm. Using 600 Ohm loads or higher, change R3 value to 100K. # An interesting upgrade for this circuit was suggested by Mike Baum, NY USA. Th 🔗 External reference
Related Circuits
The electronics consist of three op-amp circuits; each built around one half of an NE5532 dual op-amp. Each circuit uses that op-amp in a different configuration. The first circuit is a non-inverting pre-amp, the second is a unity-gain phase-inverter,...
The NJM2670 is a general-purpose 60V dual H-bridge drive integrated circuit (IC). It features a pair of H-bridges, a thermal shutdown circuit, and an alarm output. The alarm output is capable of detecting application issues, thereby significantly enhancing system...
The D-200W module features a unique design that includes overload, overvoltage, overheating, short circuit, and reverse polarity protection, as well as shock protection for various speakers. The module employs a synchronous dynamic bias circuit to minimize static power consumption,...
The OP07 operates as a non-inverting amplifier to avoid loading the millivolt signal from the thermocouple. Zener diodes are included to protect the circuit in the event of a failure in the junction contacts, heaters, or ground. A resistor-capacitor...
The EUA2123 is a highly efficient Class-D audio power amplifier capable of delivering up to 20W into a 4-ohm load in stereo mode using a single-ended (SE) configuration, or up to 40W into an 8-ohm load in mono mode...
The proposed scheme is straightforward, requiring only a few external electronic components, making it suitable for car audio construction. The output power ranges from 2 to 4 Ohms, providing 2 x 30 W (with a maximum of 2 x...