Pickup location: The pickups can be mounted on the ceiling or wall. The pickup location should be as close as possible to the main talking area. For example, the interrogation room can be installed near the person being tried; the classroom can be installed near the podium; and the small meeting room can be installed in the center of the ceiling. Principle: As close as possible to the main talking area, this sounding effect is better.
Selection and Wiring of Pickup Connecting Cables: Installation of Pickups Considering the complex construction environment, it is recommended to use 0.5mm2 cross section 3-core signal cables. That is commonly used 3 × 0.5RVVP cable, pickup power supply is generally used remote centralized power supply (that is, in the audio recording equipment / amplification equipment, centralized power supply), the use of the three-core cable, respectively, the power line, audio signal line, public Ground line. Shielded cables can be used in electromagnetic complex environments where the shielding layer is connected to the equipment ground. That is, the shielding net connected to one end of the pickup is suspended, and the shielding net connected to one end of the audio equipment is connected to the equipment ground (chassis). Note: It is best to route the cables separately. Do not use the same cable tray with strong AC power, and try to keep away from strong electromagnetic interference devices such as transformers and luminaire rectifiers.
The connection method for the positive pole of the pickup power cord: The power supply mode of the pickup requires the use of remote centralized power supply (ie centralized power supply at the audio recording device/amplifier device), whose main purpose is to have stronger capability of anti-interference and noise. Because the pickup is a very sensitive small-signal amplification device, it is sensitive to the clutter of the power supply, and it is necessary to use a clean, high quality DC stabilized power supply with a small amount of clutter. A single pickup consumes about 10-30 milliamps of current, which means a nominally 1 amp DC regulated power supply can operate at least 10 pickups at the same time. The power supply efficiency and line loss should be taken into consideration in the application. Try to use a power supply with a higher nominal value. The DC stabilized power supply referred to here is often referred to as a "transformer" and is generally composed of a power transformer, a rectifier diode, a filter capacitor, and an integrated voltage regulator. You cannot use a switching power supply. It may introduce a lot of circuit noise to the pickup.
The common ground connection of the negative power supply of the pickup and the audio ground: The audio ground of the pickup and the cathode of the power supply are combined into one and must be connected to the negative pole of the DC stabilized power supply and the ground line of the audio input (LineIn) of the audio equipment at the same time. If the power ground and audio ground are not well connected, the sound quality will be degraded or there will be no sound. If the ground of the LineIn terminal of the audio equipment is not connected to the ground of the pickup, the sound will generally be very small.
Pickup audio cable connection: Pickup audio signal line and audio ground can be directly connected to the device: Acoustic headphones, active speakers, audio amplifier, audio and video distributor, DVR hard disk recorders, video servers, mixers, tape recorders, LineIn linear input of sound card or other audio equipment (microphone interface is strictly prohibited).
1, hard disk recorders. Most hard disk video recorders have corresponding audio input ports, which are generally coaxial cable BNC plugs. The pickup audio cable needs to be connected to the center pin of the BNC plug. The pickup must be connected in common to the BNC plug's enclosure (that is, the shielded copper mesh that connects the coaxial cable).
2, comes with power amplifier active speakers. A set of ordinary active speakers are generally left and right, corresponding to the left and right audio channels, respectively. This pickup only provides one sound source, so it is a "mono" sound source. The audio cable of the pickup is connected to the left/right audio cable of the speaker cable, and the pickup is connected to the ground of the speaker cable in common.
3, other audio equipment such as power amplifiers, mixing consoles and other methods of connection are the same.
4. It is forbidden to connect the pickups to the microphone (MIC) input terminals of sound cards, mixers, amplifiers, etc., otherwise the equipment may be damaged. This is because the microphone inside contains a microphone, but it also includes amplification, noise reduction, echo processing and other circuits, output "LineOut" audio signal above 1Vpp.
5, notebook computers are rarely equipped with "LineIn" audio input jack, generally only equipped with MIC input jack and SPEAKER output jack. The pickup cannot be directly connected to the MIC port. Only a professional external USB interface desktop sound card can be purchased. Use the “LineIn†port to access it.
6, pickup audio cable can not be directly connected to the two audio devices, microphone adapter must be connected in order to avoid impedance mismatch may cause deterioration of sound quality.
Precautions: During all connections or toggle switches, adjust the volume of your amplifier to a minimum to avoid momentary electrical shock.
Selection and Wiring of Pickup Connecting Cables: Installation of Pickups Considering the complex construction environment, it is recommended to use 0.5mm2 cross section 3-core signal cables. That is commonly used 3 × 0.5RVVP cable, pickup power supply is generally used remote centralized power supply (that is, in the audio recording equipment / amplification equipment, centralized power supply), the use of the three-core cable, respectively, the power line, audio signal line, public Ground line. Shielded cables can be used in electromagnetic complex environments where the shielding layer is connected to the equipment ground. That is, the shielding net connected to one end of the pickup is suspended, and the shielding net connected to one end of the audio equipment is connected to the equipment ground (chassis). Note: It is best to route the cables separately. Do not use the same cable tray with strong AC power, and try to keep away from strong electromagnetic interference devices such as transformers and luminaire rectifiers.
The connection method for the positive pole of the pickup power cord: The power supply mode of the pickup requires the use of remote centralized power supply (ie centralized power supply at the audio recording device/amplifier device), whose main purpose is to have stronger capability of anti-interference and noise. Because the pickup is a very sensitive small-signal amplification device, it is sensitive to the clutter of the power supply, and it is necessary to use a clean, high quality DC stabilized power supply with a small amount of clutter. A single pickup consumes about 10-30 milliamps of current, which means a nominally 1 amp DC regulated power supply can operate at least 10 pickups at the same time. The power supply efficiency and line loss should be taken into consideration in the application. Try to use a power supply with a higher nominal value. The DC stabilized power supply referred to here is often referred to as a "transformer" and is generally composed of a power transformer, a rectifier diode, a filter capacitor, and an integrated voltage regulator. You cannot use a switching power supply. It may introduce a lot of circuit noise to the pickup.
The common ground connection of the negative power supply of the pickup and the audio ground: The audio ground of the pickup and the cathode of the power supply are combined into one and must be connected to the negative pole of the DC stabilized power supply and the ground line of the audio input (LineIn) of the audio equipment at the same time. If the power ground and audio ground are not well connected, the sound quality will be degraded or there will be no sound. If the ground of the LineIn terminal of the audio equipment is not connected to the ground of the pickup, the sound will generally be very small.
Pickup audio cable connection: Pickup audio signal line and audio ground can be directly connected to the device: Acoustic headphones, active speakers, audio amplifier, audio and video distributor, DVR hard disk recorders, video servers, mixers, tape recorders, LineIn linear input of sound card or other audio equipment (microphone interface is strictly prohibited).
1, hard disk recorders. Most hard disk video recorders have corresponding audio input ports, which are generally coaxial cable BNC plugs. The pickup audio cable needs to be connected to the center pin of the BNC plug. The pickup must be connected in common to the BNC plug's enclosure (that is, the shielded copper mesh that connects the coaxial cable).
2, comes with power amplifier active speakers. A set of ordinary active speakers are generally left and right, corresponding to the left and right audio channels, respectively. This pickup only provides one sound source, so it is a "mono" sound source. The audio cable of the pickup is connected to the left/right audio cable of the speaker cable, and the pickup is connected to the ground of the speaker cable in common.
3, other audio equipment such as power amplifiers, mixing consoles and other methods of connection are the same.
4. It is forbidden to connect the pickups to the microphone (MIC) input terminals of sound cards, mixers, amplifiers, etc., otherwise the equipment may be damaged. This is because the microphone inside contains a microphone, but it also includes amplification, noise reduction, echo processing and other circuits, output "LineOut" audio signal above 1Vpp.
5, notebook computers are rarely equipped with "LineIn" audio input jack, generally only equipped with MIC input jack and SPEAKER output jack. The pickup cannot be directly connected to the MIC port. Only a professional external USB interface desktop sound card can be purchased. Use the “LineIn†port to access it.
6, pickup audio cable can not be directly connected to the two audio devices, microphone adapter must be connected in order to avoid impedance mismatch may cause deterioration of sound quality.
Precautions: During all connections or toggle switches, adjust the volume of your amplifier to a minimum to avoid momentary electrical shock.
Acetic ACID is a colourless liquid organic compound with the chemical formula CH3COOH . When undiluted, it is sometimes called glacial acetic acid. As one of most important organic raw materials, it is mainly used in vinyl acetate, acetic anhydride, acetate ester, acetate, acetate fiber and chloroactic acid etc. It is an important raw material for syntesized fiber, gooey, medicines, pesticides and dyes, and also a good organic solvent. It is widely applied in industries of plastics,printing and rubber etc.
Appearance:
transparent liquid; Pungent odor,miscible with water,alcohol,ether and carbon tetrachloride; insoluble in carbon disulfide.Use :
As one of most important organic raw materials, it is mainly used in such products as Vinyl acetate, acetic anhydride, diketene, acetate ester, acetate, acetate fiber and chloroactic acid etc. It is an important raw material for synthesized fiber, gooey, medicines, pesticides and dyes, and also a good organic solvent. It is widely applied in such industries as of plastics, rubbers and printing etc. Manufacture of acetic anhydride, vinyl acetate; Widely used in solvents, dyes, celluloseacetate, pharmaceuticals, in-socticides, textile printing, photographic film and coagulating rubber tec.
Acetic Acid,Acetic Acid Glacial,Glacial Acetic Acid,Acetic Acid Industry Grade
Yucheng Jinhe Industrial Co.,Ltd , https://www.jinhetec.com