CN-224218367-U - Gooseneck microphone pre-amplifying circuit

Abstract

The application relates to the technical field of microphone circuits, and discloses a gooseneck microphone pre-amplifying circuit, which is characterized in that the signal intensity is enhanced by multistage amplification, an adjustable compensation filter circuit is formed based on elements such as a potentiometer R78 and the like, element protection elements are formed based on an amplitude limiter D35 and the like, the triode Q24 and the field tube Q12 form a feedback compensation circuit, so that the circuit is stable under different environments, and the gooseneck microphone is ensured to continuously and reliably output high-quality audio.

Inventors

• Ye Pingting

Assignees

• 广州华燎电气科技有限公司

Dates

Publication Date

20260508

Application Date

20250417

Claims (1)

1. 1. The gooseneck microphone pre-amplification circuit is characterized by comprising a capacitor C35, a capacitor C56, a capacitor C137, a capacitor C52, a capacitor C108, a capacitor C34, a capacitor C54, a capacitor C48, a capacitor C38, a capacitor C49, a capacitor C53, a capacitor C102, a capacitor C47, a resistor R69, a resistor R70, a resistor R62, a resistor R67, a resistor R56, a resistor R202, a resistor R170, a resistor R71, a resistor R44, a resistor R45, a resistor R43, a resistor R79, a resistor R58, a resistor R46, a resistor R144, a resistor R64, a socket J5, a selection channel ESWS, a limiter D35, a limiter D34, a chip U1B, a chip U2B, a triode Q24, a field tube Q12 and a potentiometer R78; The 1 foot of the capacitor C35, the 1 foot of the resistor R69 and the 1 foot of the capacitor C56 are all connected with the 3 foot of the socket J5, the 2 foot of the socket J5 is suspended, the 1 foot of the socket J5 is grounded, the 2 foot of the capacitor C35 is grounded, the positive pole of the polar capacitor C48, the 1 foot of the resistor R70 and the 1 foot of the resistor R62 are all connected with the 2 foot of the resistor R69, the negative pole of the polar capacitor C48 and the 2 foot of the resistor R70 are all grounded, the 2 foot of the resistor R62 is connected with GNDA, the 1 foot and the 2 foot of the limiter D35, the 2 foot of the resistor R67 and the 5 foot of the chip U2B are all connected with the 2 foot of the capacitor C56, the 3 foot of the limiter D35, 1 foot of the resistor R67, The positive pole of the polarity capacitor C38, the 1 pin of the resistor R56 and the 3 pin of the limiter D34 are connected with the 5 pin of the chip U1B, the negative pole of the polarity capacitor C38 is grounded, the 2 pin of the resistor R56 is grounded, the 2 pin of the limiter D34 is connected with VCC, the 1 pin of the limiter D34 and the 1 pin of the resistor R202 are connected with GNDA, the 2 pin of the resistor R202 and the 1 pin of the capacitor C137 are connected with the 6 pin of the chip U1B, the 2 pin of the capacitor C137 and the 7 pin of the chip U1B are connected with the 1 pin of the resistor R170, the 2 pin of the resistor R170 is connected with GNDA, the emitter of the triode Q24 and the 1 pin of the resistor R71 are connected with VCC, the 2 pin of the resistor R44 is connected with the base of the triode Q24, the 2 pin of the resistor R44 is connected with VCC 44, the 2 pin of the resistor C52 is connected with the capacitor C2 pin of the resistor C12, the positive pole of the resistor C2 is connected with the Q12, the capacitor C2 pin of the resistor C2 is connected with the Q4 is connected with the Q3 of the resistor C12, the Q4 is connected with the Q3 of the Q4, the Q4 is connected with the Q4 The 1 foot of the resistor R58 and the 1 foot of the capacitor C34 are connected with the 6 feet of the chip U2B, the 2 foot of the resistor R58 and the 1 foot of the resistor R46 are connected with the 1 foot of the capacitor C108, the 2 foot of the resistor R46, the 2 foot of the capacitor C34 and the 1 foot of the capacitor C54 are connected with the 3 feet of the potentiometer R78, the 2 foot of the capacitor C108 and the negative electrode of the polar capacitor C102 are grounded, the positive electrode of the polar capacitor C102 is connected with the 1 foot of the resistor R144, the 2 foot of the resistor R144 is connected with the 2 foot of the potentiometer R78, the 2 foot of the capacitor C54, The 1 foot of the potentiometer R78, the 1 foot of the capacitor C52 and the 7 foot of the chip U2B are connected with the negative electrode of the polar capacitor C47, the positive electrode of the polar capacitor C47 and the 1 foot of the resistor R64 are connected with the selection channel ESWS4, and the 2 foot of the resistor R64 is connected with the GNDA.

Description

Gooseneck microphone pre-amplifying circuit Technical Field The application relates to the technical field of microphone circuits, in particular to a gooseneck microphone pre-amplifying circuit. Background In the field of modern communication and audio equipment, gooseneck microphones are widely used in conference, speech and other scenes. The traditional gooseneck microphone pre-amplifying circuit has a plurality of defects in signal processing, and is particularly: 1. The signal input and processing structure of the existing circuit is simple, and for weak microphone audio signals, efficient acquisition and preliminary amplification cannot be carried out, so that the signals are easy to be interfered by the outside, noise exists in the output sound, and the audio quality is seriously affected; 2. In the aspect of gain adjustment function, the existing circuit lacks a flexible and accurate adjustment mechanism, usually only can carry out fixed gain amplification, and the volume of a microphone is difficult to accurately adjust according to actual use scenes and requirements; 3. The stability of the existing circuit is also poor, the circuit performance fluctuation is large under different conditions of environmental temperature, humidity and the like, and stable and reliable audio output cannot be ensured. In summary, these problems greatly limit the effectiveness of the gooseneck microphone in practical applications, and a new pre-amplifier circuit for the gooseneck microphone is needed to solve these technical problems. Disclosure of utility model The application aims to provide a gooseneck microphone pre-amplifying circuit so as to solve the technical problems in the background technology. The gooseneck microphone pre-amplification circuit comprises a capacitor C35, a capacitor C56, a capacitor C137, a capacitor C52, a capacitor C108, a capacitor C34, a capacitor C54, a polarity capacitor C48, a polarity capacitor C38, a polarity capacitor C49, a polarity capacitor C53, a polarity capacitor C102, a polarity capacitor C47, a resistor R69, a resistor R70, a resistor R62, a resistor R67, a resistor R56, a resistor R202, a resistor R170, a resistor R71, a resistor R44, a resistor R45, a resistor R43, a resistor R79, a resistor R58, a resistor R46, a resistor R144, a resistor R64, a socket J5, a selection channel ESWS4, a limiter D35, a limiter D34, a chip U1B, a chip U2B, a triode Q24, a field tube Q12 and a potentiometer R78; The 1 foot of the capacitor C35, the 1 foot of the resistor R69 and the 1 foot of the capacitor C56 are all connected with the 3 foot of the socket J5, the 2 foot of the socket J5 is suspended, the 1 foot of the socket J5 is grounded, the 2 foot of the capacitor C35 is grounded, the positive pole of the polar capacitor C48, the 1 foot of the resistor R70 and the 1 foot of the resistor R62 are all connected with the 2 foot of the resistor R69, the negative pole of the polar capacitor C48 and the 2 foot of the resistor R70 are all grounded, the 2 foot of the resistor R62 is connected with GNDA, the 1 foot and the 2 foot of the limiter D35, the 2 foot of the resistor R67 and the 5 foot of the chip U2B are all connected with the 2 foot of the capacitor C56, the 3 foot of the limiter D35, 1 foot of the resistor R67, The positive pole of the polarity capacitor C38, the 1 pin of the resistor R56 and the 3 pin of the limiter D34 are connected with the 5 pin of the chip U1B, the negative pole of the polarity capacitor C38 is grounded, the 2 pin of the resistor R56 is grounded, the 2 pin of the limiter D34 is connected with VCC, the 1 pin of the limiter D34 and the 1 pin of the resistor R202 are connected with GNDA, the 2 pin of the resistor R202 and the 1 pin of the capacitor C137 are connected with the 6 pin of the chip U1B, the 2 pin of the capacitor C137 and the 7 pin of the chip U1B are connected with the 1 pin of the resistor R170, the 2 pin of the resistor R170 is connected with GNDA, the emitter of the triode Q24 and the 1 pin of the resistor R71 are connected with VCC, the 2 pin of the resistor R44 is connected with the base of the triode Q24, the 2 pin of the resistor R44 is connected with VCC 44, the 2 pin of the resistor C52 is connected with the capacitor C2 pin of the resistor C12, the positive pole of the resistor C2 is connected with the Q12, the capacitor C2 pin of the resistor C2 is connected with the Q4 is connected with the Q3 of the resistor C12, the Q4 is connected with the Q3 of the Q4, the Q4 is connected with the Q4 The 1 foot of the resistor R58 and the 1 foot of the capacitor C34 are connected with the 6 feet of the chip U2B, the 2 foot of the resistor R58 and the 1 foot of the resistor R46 are connected with the 1 foot of the capacitor C108, the 2 foot of the resistor R46, the 2 foot of the capacitor C34 and the 1 foot of the capacitor C54 are connected with the 3 feet of the potentiometer R78, the 2 foot of the capacitor C108 and the negative electrode of the