Acoustic preamplifier

Abstract

The utility model discloses an acoustical preamplifier, which relates to the related technical field of amplifiers, and comprises a preamplifier and a windshield, the preamplifier is connected with a microphone, the preamplifier comprises a shell, an inner cavity penetrating up and down is arranged in the shell, a probe is arranged in the inner cavity, and the probe is connected with the windshield. The inner wall of the inner cavity is provided with a shielding cylinder capable of moving up and down, the shielding cylinder sleeves the outer side of the probe, the shielding cylinder is movably connected with the inner wall of the inner cavity, and the upper end of the shielding cylinder abuts against the microphone; according to the utility model, the shielding cylinder is movably installed in the inner cavity, the shielding cylinder is easy to store, the shielding cylinder can stretch out conveniently when the shielding cylinder needs to be used, the probe can be protected, signals can be protected from being interfered, and the spring in the inner cavity can control the shielding cylinder to pop out autonomously, so that the probe can be better protected.

Description

Technical Field

[0001] The utility model relates to the technical field related to amplifiers, and in particular to an acoustic preamplifier. Background Art

[0002] Preamplifier: Since the capacitance of the condenser microphone is very small and the internal resistance is very high, and the impedance of the post-stage attenuator and amplifier cannot be very high, a preamplifier is needed in the middle to perform impedance conversion.

[0003] The probe in the preamplifier is connected to the microphone. Due to the small capacitance of the microphone, the signal is weak. A shielding tube is required around the probe to protect the signal from interference.

[0004] Today's shielding tubes are all fixed. Firstly, the length is difficult to control, and secondly, they cannot completely cover the probe. Utility Model Content

[0005] Purpose of the invention: The purpose of the utility model is to provide an acoustic preamplifier to solve the problem that the shielding tube cannot protect the probe well.

[0006] Technical Solution

[0007] An acoustic preamplifier includes a preamplifier and a windshield, a microphone is connected to the preamplifier, and the preamplifier includes a shell, an inner cavity is provided in the shell and extends vertically through the shell, a probe is installed in the inner cavity, a shielding tube that can move vertically is installed on the inner wall of the inner cavity, the shielding tube is sleeved on the outside of the probe, the shielding tube is movably connected to the inner wall of the inner cavity, and the upper end of the shielding tube abuts against the microphone.

[0008] Preferably, an insulating seat and a bottom cover are fixedly installed in the inner cavity, a PCB circuit board is fixedly installed between the insulating seat and the bottom cover, the probe is fixedly connected to the PCB circuit board, and the probe extends upward from the insulating seat.

[0009] Preferably, a spring is provided between the bottom cover and the insulating seat, one end of the spring is fixedly connected to the bottom cover, and the other end of the spring is connected to a movable block, and the movable block is fixedly connected to the shielding cylinder.

[0010] Preferably, the spring, the shielding tube and the movable block are all sleeved on the outside of the PCB circuit board, and the movable block is slidably connected to the inner cavity.

[0011] Preferably, a connecting wire is fixedly connected to the lower end of the PCB circuit board, and the connecting wire extends downward from the bottom cover.

[0012] Preferably, the windshield is magnetically connected to the upper end of the shell, and there is space inside the windshield to accommodate the microphone and the shielding tube.

[0013] Preferably, the lower end of the wind shield is provided with a magnetic ring connected to the outer shell.

[0014] Beneficial effects: The shielding tube is movably installed in the inner cavity, and the shielding tube is easy to store and convenient to extend when needed, which can protect the probe and protect the signal from interference. At the same time, the spring in the inner cavity can control the shielding tube to pop out automatically, thereby better protecting the probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the amplifier structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the dynamic structure of the amplifier of the utility model;

[0018] Figure 4 This is a schematic structural diagram of the windshield of the present invention.

[0019] Figure numerals: 1. wind shield; 2. preamplifier; 11. PCB circuit board; 12. insulating seat; 13. movable block; 14. outer shell; 15. bottom cover; 16. spring; 17. shielding tube; 18. probe; 19. connecting wire; 21. frame; 22. sponge wind ball; 23. magnetic ring; 31. inner cavity; 32. perforation. DETAILED DESCRIPTION

[0020] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0021] like Figures 1 to 4 As shown, an acoustic preamplifier includes a preamplifier 2 and a windscreen 1. The preamplifier 2 and the windscreen 1 are detachably connected. A microphone is connected to the upper end of the preamplifier 2. When the preamplifier 2 and the windscreen 1 are connected, the microphone is accommodated inside the windscreen 1.

[0022] The wind shield 1 includes a frame 21, which is a hollow structure with a spherical upper end and a thin strip structure around it. The thin strips are evenly arranged radially from the center to the outside, and a sponge wind ball 22 is provided on the frame 21. The outer contour is spherical and the inside is open, with a large inner hole and a small outer hole. At the same time, a magnetic ring 23 is fixedly connected to the lower end of the frame 21. The magnetic ring 23 is a circular ring made of a strong magnetic material.

[0023] The frame 21 serves as the supporting body, and the sponge wind ball 22 is sleeved on the outside of the frame 21. The sponge wind ball 22 is fixed in position to prevent it from falling off due to the feature that the outer contour of the frame 21 is larger at the top and smaller at the bottom and the elastic material properties of the sponge itself. The magnetic ring 23 is adhered to the groove at the bottom of the frame 21. When the wind shield 1 and the preamplifier 2 are connected, the magnetic ring 23 will be adsorbed on the preamplifier 2.

[0024] like Figure 2 As shown, the preamplifier 2 includes a housing 14 , and the magnetic ring 23 is sleeved on the upper end of the housing 14 .

[0025] An inner cavity 31 extending from top to bottom is provided in the outer shell 14. An insulating seat 12 and a bottom cover 15 are fixedly installed in the inner cavity 31. The insulating seat 12 is located at the upper end of the inner cavity 31, and the bottom cover 15 is located at the bottom of the inner cavity 31. A PCB circuit board 11 is fixedly installed between the bottom cover 15 and the insulating seat 12. The PCB circuit board 11 is a circuit board of a conventional preamplifier. The existing technology is mature and comes in various forms.

[0026] The upper end of the PCB circuit board 11 is fixedly connected to a probe 18, and the lower end of the PCB circuit board 11 is fixedly connected to a connecting wire 19. There are through-holes 32 on both the insulating seat 12 and the bottom cover 15, but the PCB circuit board 11 cannot pass through the through-holes 32. The probe 18 passes through the insulating seat 12 upward, and the connecting wire 19 passes through the bottom cover 15 downward.

[0027] A large gap is left between the insulating seat 12 and the bottom cover 15. A movable block 13 is installed in the inner cavity 31 for sliding up and down in the gap. The movable block 13 runs through the middle and is sleeved on the outside of the PCB circuit board 11 and the probe 18. A spring 16 is left between the movable block 13 and the bottom cover 15. The lower end of the spring 16 is fixedly connected to the bottom cover 15, and the upper end of the spring 16 is fixedly connected to the movable block 13.

[0028] The upper end of the movable block 13 is fixedly connected to a shielding tube 17, which is sleeved on the outside of the probe 18. At the same time, the shielding tube 17 passes upward through the insulating seat 12, and the probe 18 and the shielding tube 17 both extend out of the upper end of the shell 14. The probe 18 and the shielding tube 17 can be connected to the microphone. When the microphone and the shell 14 are connected, the microphone squeezes the shielding tube 17 downward, and the probe 18 will extend into the inner side of the microphone. When the microphone and the shell 14 are separated, the shielding tube 17 will recover upward under the action of the spring 16, and the shielding tube 17 can cover the probe 18 again.

[0029] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An acoustic preamplifier, comprising a preamplifier (2) and a windshield (1), wherein the preamplifier (2) is connected to a microphone, and characterized in that: The preamplifier (2) includes a shell (14), an inner cavity (31) extending vertically through the shell (14), a probe (18) being installed in the inner cavity (31), and an inner wall of the inner cavity (31) being provided with a shielding tube (17) movable vertically, the shielding tube (17) being sleeved on the outer side of the probe (18), the shielding tube (17) being movably connected to the inner wall of the inner cavity (31), and the upper end of the shielding tube (17) being in contact with the microphone.

2. An acoustic preamplifier according to claim 1, characterized in that: An insulating seat (12) and a bottom cover (15) are fixedly installed in the inner cavity (31), a PCB circuit board (11) is fixedly installed between the insulating seat (12) and the bottom cover (15), the probe (18) is fixedly connected to the PCB circuit board (11), and the probe (18) extends upward from the insulating seat (12).

3. An acoustic preamplifier according to claim 2, characterized in that: A spring (16) is provided between the bottom cover (15) and the insulating seat (12), one end of the spring (16) is fixedly connected to the bottom cover (15), the other end of the spring (16) is connected to a movable block (13), and the movable block (13) is fixedly connected to the shielding cylinder (17).

4. An acoustic preamplifier according to claim 3, characterized in that: The spring (16), the shielding tube (17), and the movable block (13) are all sleeved on the outside of the PCB circuit board (11), and the movable block (13) and the inner cavity (31) are slidably connected.

5. The acoustic preamplifier according to claim 2, characterized in that: A connecting wire (19) is fixedly connected to the lower end of the PCB circuit board (11), and the connecting wire (19) extends downward from the bottom cover (15).

6. The acoustic preamplifier according to claim 1, characterized in that: The windshield (1) and the upper end of the housing (14) are magnetically connected, and there is a space in the windshield (1) for accommodating the microphone and the shielding tube (17).

7. An acoustic preamplifier according to claim 6, characterized in that: The lower end of the wind shield (1) is provided with a magnetic ring (23) connected to the housing (14).

Images