Headset volume control circuit of key general mobile phone

Abstract

The invention discloses a headset volume control circuit of a key general mobile phone. The headset volume control circuit is characterized by comprising a power processing circuit 104, a key processing circuit 101, a decoding circuit 102, a resistance switch array 103 and a microphone (MIC) output control switch 105, wherein audio signals, which are output by a mobile phone headset, of left and right sound channels respectively pass through a first resistor R1 and a second resistor R2 and then are short-circuited together to synthesize a sound; the audio signals enter the resistance switch array 103 inside the circuit through a Vh pin; and by controlling different resistance switches, the audio signals pass through resistors with different sizes and are output to an external headset loudspeaker through a Vw pin so as to control volume size. The headset volume control circuit can be applied to any mobile phone. A direct current reference level of an MIC pin of the mobile phone serves as a power supply in the headset volume control circuit, so a current which can be supplied is smaller, the own power consumption of a designed chip is quite low, and an independent power supply is not required.

Description

technical field [0001] The invention relates to the technical field of earphone volume control, in particular to the technical field of mobile phone earphone volume control. Background technique [0002] There are two types of mobile phone earphones currently on the market. One is the earphones bundled with various mobile phone brands. This earphone can only be used on the corresponding mobile phone model, and other mobile phones cannot be used; This kind of earphone can only be used on the specified model and cannot be used universally. From a functional point of view, the situation of mobile phone earphones on the market is very confusing. Some earphones cannot adjust the volume, some earphones need to be identified with the code inside the mobile phone, and some volume adjustments are realized by adjusting the mechanical potentiometer, which is very large. , and some require an additional battery to achieve volume adjustment, which also has the problem of large volume an...

AI Technical Summary

Problems solved by technology

[0002] There are two types of mobile phone earphones currently on the market. One is the earphones bundled with various mobile phone brands. This earphone can only be used on the corresponding mobile phone model, and other mobile phones cannot be used; This kind of earphone can only be used on the specified model and cannot be used universally

From a functional point of view, the situation of mobile phone earphones on the market is very confusing. Some earphones cannot adjust the volume, some earphones need to be identified with the code inside the mobile phone, and some volume adjustments are realized by adjusting the mechanical potentiometer, which is very large. , and some need an additional battery to achieve volume adjustment, and there is also the problem of large volume and high cost

Thereby the mobile phone earphones on the market are not universal, the function is not perfect, the cost is high, and the shortcomings such as inconvenient to use exist.

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