How to avoid the audible sound when the audio equipment is installed and connected: 2. Weak signal equipment power supply and strong signal equipment power group connection weak signal source equipment such as CD, deck, effects, mixer, compression limiter and equalizer are equivalent to a set of power connections, strong signal power amplifier and another The group power supply connection can avoid the conduction noise interference of the conduction mode. 3. Separate the signal ground wires between two acoustic devices with different "ground" potentials to avoid direct connection of devices or ground loops. For example, if the balanced connection outer shield wire is grounded at one end, or both ends are not grounded. 4. When connecting clean power supply and power supply design, separate power supply transformer should be designed; when unconditional, use a separate set of power supply, separate from air conditioner, lighting and other equipment; or use isolated power transformer, etc., these are effective Measures. 5, the use of floating ground is the point of the same potential and ground, zero potential. But this point is not directly connected to the ground. It is the point at which the audio equipment circuit has zero ground potential. There is impedance between this "ground" and the actual ground, and it is high impedance, which can overcome common mode interference. 6. There should be no DC circuit connection between the two audio equipment. 7. Different system connections must be connected by a balanced isolation transformer to connect the audio system to the audio system of the TV OB; the connection between the system and the large electronic display; or the connection to an electronic computer, generally with a balanced isolation transformer. Different systems are most likely to cause interference from AC noise. 8. Long-distance transmission signals use balanced or balanced isolation transformer transmission methods, and short-distance distances can be used. The transmission method using the balanced isolation transformer generally has a balance transformer at both ends, and the shielding layer is grounded at one end, and can also be left unconnected. Grounding can be used as a shielding function to prevent electric shock from leakage of equipment. When not grounded, the balance transformers at both ends can provide insulation isolation, balance the center of the transformer, and discharge static electricity. 9. In the case of serious power interference, the phase-to-phase connection of the equipment connects the audio equipment of the small signal and the power supply of the monitoring equipment together, and selects one phase of the three-phase power supply with the least interference of the hum, and the other two are connected to the large signal. A power amplifier that reduces AC noise interference from the power supply. 10. Check if your grid power is not clean; 11. Is it a grounding problem with some equipment? 12, the other is to look at the equipment connection and there is no interference (made messy / interface has no solder joints); 13. Look at the interference from the light (silicon box, signal line): 14, usually the sound of the audio is louder than the sound of the amplifier, the power amplifier signal to noise ratio is not very good, it will make a loud noise. First check if it is a signal line problem, just unplug all the signal lines and turn on the power amplifier. If there is no loud humming sound in the speaker, then it is a problem with the signal line. First, check if the plug has a short circuit. The multimeter is relatively accurate. If you have any, re-splicing the plug is enough. If this doesn't work, then only change the signal line. Unplugging the signal line still has a very loud hum. That is the problem of the amp, which means that the amp is relatively poor. To solve this problem, only the amp is changed.
Electric dc motors were the
first type widely used, since they could be powered from existing
direct-current lighting power distribution systems. A electric 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 electric dc motor 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 electric dc motor are used
in propulsion of electric vehicles, elevator and hoists, or in drives for steel
rolling mills.
Areas of application: the Electric Dc Motor rotor part of the armature iron core, armature, commutator, such as equipment, electric dc motor is suitable for most electronic products, such as electric screwdriver, laser, smart home, gas valve, etc
Applications:
Method of use: the best stable in
horizontal plane, installed on theelectric dc motor output
shaft parts, cannot use a hammer to knock, knock prone to press into the electric
dc motor drive, may cause damage to internal components, and cannot be
used in the case of blocked.
Operating
temperature range:
Electric 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 electric dc 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:
Electric 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
geared motors 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.
Electric Dc Motor Electric Dc Motor,Mini Electric Motor,12V Electric Motor,Electric Motor Gearbox Shenzhen Shunchang Motor Co., LTD. , https://www.scgearmotor.com
1. The casing of a properly grounded audio equipment is generally connected to the power transformer shield of the equipment. This equipment enclosure also has a "ground". This "ground" is different from the other two "grounds". When the "ground" of the earth is more disturbing, the "ground" of the equipment casing can be connected to reduce the audible interference, and vice versa.
