1. The best position of the speaker from the microphone is 15~40 cm <br> If the distance is too close, the bass part of the speaker will be distorted due to excessive volume. If the distance is too close, it will produce a "near-field effect". The performance is that it adds too much bass, the speech is confusing, and the serious one is completely inaudible. But if the background noise is too large, sometimes you have to talk close to the microphone. At this time, a microphone that can attenuate the bass can be selected. The better microphone design has a built-in bass attenuation device, which can reduce the distortion caused by being too close to the microphone. If you don't have such a microphone, it is also helpful to compress the bass on the amplifier.
If the speaker must speak at a greater distance, the microphone will simultaneously record other sounds in the space, thus affecting the clarity of the speech. If the microphone is in the same room as the speaker, the sound from the speaker will be amplified by the microphone and repeated, and the situation will be even worse. In the end, echo whistling may occur.
2, the microphone should be aimed at the mouth, to the line <br> Since the directional microphone receives the highest sensitivity from the straight line, the speaker should aim the microphone at the mouth to the line to avoid the sound. Getting worse.
3. Try to keep a certain volume when speaking. <br> In the public address system, a volume limiter can also be used to protect the expander. The volume limiter helps the user to control the microphone output volume, avoiding sudden volume out of control, frightening the listener, or damaging the audio equipment.
The function of the volume limiter is not because the "correction" speaker is swaying, but to help the speaker convey the message to be conveyed in a clear and gentle tone.
A Dc Motor is any of a class of rotary electrical machines that converts direct current electrical energy into mechanical energy. The most common types rely on the forces produced by magnetic fields. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current flow in part of the motor.
DC motors were the first type widely used, since they could be powered from existing direct-current lighting power distribution systems. A DC motor's speed can be controlled over a wide range, using either a variable supply voltage or by changing the strength of current in its field windings. Small DC motors are used in tools, toys, and appliances. The universal motor can operate on direct current but is a lightweight motor used for portable power tools and appliances. Larger DC motors are used in propulsion of electric vehicles, elevator and hoists, or in drives for steel rolling mills.
Dc motor areas of application: smart home field, robotics, precision medical equipment industry, automotive drive field, electronic products and personal care equipment
Application of the product:
Features: high torque, low noise, small volume, light weight, easy to use, running constant speed, etc., can also be matched with various gearboxes to change the output speed and torque.
Features: small volume, fast speed, stable performance, low price, good speed regulation.
Method of use: the best stable in horizontal plane, installed on the dc motor output shaft parts, cannot use a hammer to knock, knock prone to press into the dc motor drive, may cause damage to internal components, and cannot be used in the case of blocked.
Operating temperature range:
DC motor should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a geared motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
DC motor should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
The longevity of DC motor is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
when it come to volume production,we're a major player as well .each month,we rurn out 600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you Looking forward to your inquiry. Welcome to our factory.
Dc Motor
Dc Motor,Small Dc Motor,Mini Dc Motor,Robot Dc Motor,Dc Motor With Gearbox
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