How to choose a click/pop suppressor

l Introduction The click/pop suppressor is a stand-alone device that can be added to the system later in the design to eliminate clicks/pops without changing the original design. The MAX9890 and MAX9892 devices are designed to eliminate the click/pop of the headphone playback system. Different solutions can solve the problem of clicks and clicks generated at different times and from different sources in the design.

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2 MAX9890 series switching scheme MAX9890 can only eliminate the click/噼噗 caused by the output coupling capacitor. Many headphone playback systems couple the headphone amplifier to the sensor through DC blocking capacitor. In these systems, the main click/pop source is coupled. Charge and discharge of the capacitor when it is turned on and off. The capacitance of the coupling capacitor is usually between 100 and 330 μF, and the “beep” generated by the capacitor charging is very strong. Figure 1 shows the MAX9890 click/pop suppressor.


To solve the click/pop problem caused by the coupling capacitor, the MAX9890 slowly charges and discharges the control capacitor at a lower frequency than the audio band. To achieve this goal, the MAX9890 is placed between the amplifier and the coupling capacitor. When turned on, the device slowly applies the DC bias of the headphone amplifier to the capacitor through two switches. When turned off, the coupling capacitor is slowly discharged through the resistor.
The MAX9890's series-switch approach is very effective at suppressing clicks/pops from coupling capacitors, but has no effect on clicks/pops caused by other causes. In addition, this scheme assumes that the headphone impedance on the output side of the coupling capacitor is low. This design is not very efficient for line-out designs with typical loads greater than 10 kΩ.

3 MAX9892 Bypass Mode If the source of the click/pop is not an output coupling capacitor or a line-out output, the ideal solution is the MAX9892. The MAX9892 places a switch between each output and ground, and the switch turns to ground on power-up and power-down. When the switch is closed, the output will be completely muted, eliminating all clicks and clicks, as shown in Figure 2.


To provide sufficient attenuation, the MAX9892 requires a resistor in series with the amplifier and the socket. This resistor, together with the MAX9892's switch, forms the voltage divider at the output, attenuating the click and click of the amplifier. After the click and click, the MAx9892 is disabled and no longer has any effect on the output signal.

4 Conclusion There are many devices that can suppress audible noise in the design, and their functions are different. Each device is not ideal for any noise suppression application. When selecting a click/pop suppressor, it is necessary to determine which devices are most suitable based on some basic questions, such as: Does the headphone load meet the requirements? Is the coupling capacitor the only source of clicks and clicks in the system? The answer to these two questions is yes, then the MAX9890 is ideal for eliminating clicks and clicks; otherwise, the MAX9892 will be the best solution to the click/pop problem.

6.7MM Wire To Board Connectors

6.7MM Wire To Board Connectors.6700series.


What are the main types of wire to wire connectors? In the connector industry, there is also a kind of product called connecting wire, which is often said to be terminal wire. Some terminals have terminals at one end, the other end is welded on the circuit board, and some have terminals at both ends. When these terminals form a male and a female, when the wire rod and wire rod form a mutual connection, the terminal can be regarded as A wire to wire connector, that is to say, most terminal blocks are a wire to wire connector product.


Line to board connector, connector product connecting wire or cable to circuit board. The main embodiment of the line to board connector is that the I / O terminal wire is formed by adding a connector, and the other end of the terminal line is welded on the circuit board, and the connection relationship is formed by the male and female docking of the connector, forming a complete connection scheme. Relatively speaking, many connectors can form a line-to-line relationship, and can also form a line-to-board relationship. One of the more easily distinguished cases is that one section of the connector is welded to the circuit board, and not all connectors are installed on the circuit board in the common welding way.

6.7MM Wire To Board Connectors

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