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General Description: The BA3840KV is a preset graphic equalizer IC for headphone stereos. It combines two equalizer circuit channels ona single chip, and also includes a dynamic sound leak reduction circuit. Circuit diagram: Graphic Equalizer for Headphone Stereos Datasheet for BA3840: Download

Class A headphone amplifier Class A headphone amplifier

This is very easy build Electronic Schematic Circuit of Hybrid Headphone Amplifier Circuit. Potentially, headphone listening can be technically superior since room reflections are eliminated and the intimate contact between transducer and ear mean that only tiny amounts of power are required. The small power requirement means that transducers can be operated at a small fraction of their full excursion capabilities thus reducing THD and other non-linear distortions. This design of a dedicated headphones amplifier is potentially controversial in that it has unity voltage gain and employs valves and transistors in the same design. Normal headphones have an impedance of 32R per channel. The usual standard line output of 775 mV to which all quality equipment aspires will generate a power of U2 / R = 0.7752 / 32 = 18 mW per channel across a headphone of this impedance. An examination of available headphones at well known high street emporiums revealed that the sensitivity varied from 96 dB ...

A photodiode Dl feeds high gain IR remote control preamp 1C, a CA3237E. U2 is a PLL FM detector tuned to around 100 kHz. The detector output is amplified by U3 and it can drive a speaker or a set of headphones. Wireless IR Headphone Receiver Circuit Schematic

Using the LM48824 integrated circuit , can be designed a very simple stereo headphone amplifier for portable devices . Stereo Headphone Amplifier Circuit diagram The LM48824’s Stereo Headphone Amplifier (Class G architecture ) increases audio (MP3, mobile TV, etc.) playback time with its adaptive power supply approach that enables very low supply rails, which doubles the power-efficiency compared to typical Class AB headphone amplifiers. A high output impedance mode allows the LM48824's outputs to be driven by an external source without degrading the signal.

Designs for good-quality headphone amplifiers abound, but this one has a few special features that make it stand out from the crowd. We start with a reasonably conventional input stage in the form of a differential amplifier constructed from dual FET T2/T3. A particular point here is that in the drain of T3, where the amplified signal appears, we do not have a conventional current source or a simple resistor. T1 does indeed form a current source, but the signal is coupled out to the base of T5 not from the drain of T3 but from the source of T1. Notwithstanding the action of the current source this is a low impedance point for AC signals in the differential amplifier. Precision Headphone Amplifier Circuit diagram: Precision Headphone Amplifier Circuit Diagram Measurements show that this trick by itself results in a reduction in harmonic distortion to considerably less than –80 dB (much less than 0.01 %) at 1 kHz. T5 is connected as an emitter follower and provides a low impedance drive...

Headphone amplifier circuit with op amp ic OPA134, 2134, NE5532, 5534. Headphone amplifier circuit with op amp

This is the Simple Headphone Amplifier Circuit Diagram. You can use any NPN transistor. You can drive this circuit with a 9V batery. . Simple Headphone Amplifier Circuit Diagram