46 results about "Headphone amplifier" patented technology

The invention discloses a portable headphone amplifier casing for improving bandage stability. The portable headphone amplifier casing includes a casing body, first fixing grooves which are mutually symmetrically distributed are formed in the upper and lower ends of one side of the bottom of the casing, clamping plates are disposed in the first fixing grooves, the inner side of each first fixing groove is provided with a second fixing groove communicated with the first fixing groove, a first rotating wheel and a second rotating wheel which are symmetrically distributed are disposed in each second fixing groove, the first rotating wheel is connected with the second rotating wheel through a fixing belt, one side of the fixing belt is connected with the inner side of the clamping plate, the second rotating wheels are connected with a rotating shaft in the form of gear meshing, the upper end of the bottom of the casing is provided with a first adjusting groove, and an adjusting gear is arranged in the first adjusting groove. The other side of the bottom of the casing is provided with a first clamping groove clamped with the clamping plate, and the joint of the fixing belt and the clamping plate is provided with an elastic belt. The inner side of the fixing belt is provided with anti-sliding rubber, the anti-sliding rubber is distributed in a segmented mode, and the length of the anti-sliding rubber is equal to the width of the casing. The design is simple to operate, and the portable headphone amplifier casing is high in comprehensive practicality and easy to popularize and use.

Provided herein are a headphone amplifier circuit for a headphone driver, an operation method thereof, and a universal serial bus (USB) interfaced headphone device using the same. The output stage of the headphone amplifier circuit is improved to have a differential output structure so as to effectively solve the crosstalk issue and increase the isolation between the left and the right channels such that the audio content presents a spatial perception and a distance perception more specifically.

A portable earphone amplifier provided by the present invention includes a charging module, a positive and negative boost module, a filament power supply module, a 35V boost circuit module and an amplifying circuit module, wherein the charging module is respectively powered by the positive and negative boost modules and the filament The module is connected with the 35V boost circuit module, which is used to provide power to the positive and negative boost modules and the filament power supply module; The operation provides voltage; the filament power supply module is connected to the filament of the electronic tube; the amplifying circuit module adopts the dual amplifier circuit of the electronic tube pre-stage buffer tuning circuit and the post-stage integrated op-amp amplifier circuit for secondary coupling; among them, the electronic tube pre-stage buffer tuning circuit The audio circuit is an electronic tube signal amplifying circuit; the post-stage integrated operational amplifier amplifying circuit is an amp signal amplifying circuit; this structure greatly reduces the size and required volume of the power supply circuit.