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What is the difference between audio jack and headphone jack?

2023-08-16

What is the difference between audio jack and headphone jack?

The headphone jack signal is taken from the speaker output port live (high-power power amplifiers can set attenuation resistance), the output audio signal is the signal amplified by the final power amplifier, the output impedance is a few ohms to the transistor output port, the output voltage range The signal of the audio output port (usually called the line output) is taken from the final power amplifier, the output impedance is several thousand ohms to the transistor thousand ohms, and the output voltage range is several hundred volts to several volts.

Small power audio equipment such as mobile phones and MP3s can directly output signals from the headphone port, and only provide power amplifiers for final power amplification. At this time, the power amplifier is called a "power connector"; but in order to obtain good signal quality, generally The connection of audio equipment, such as connecting multiple power amplifiers and recording equipment, etc., all get signals from the "line output" port. The standard output port of the audio source device is "line output", because the signal will be generated after power amplification in the later stage Increasing distortion.

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