The low frequency circuit is distinguished from the high frequency circuit by the operating frequency of the circuit. Analog circuits are relative to digital circuits. It is distinguished by the way the circuit (device) works. Belong to two different ways of distinguishing. No difference is a concept that can be defined on a circuit at the same time. For example, an audio circuit belongs to a low frequency analog circuit.
One: high frequency circuit and low frequency circuit frequency division high and low frequency division:Very low frequency ELF 3KHZ below very low frequency VLF 3-30KHZ low frequency LF 30-300KHZ intermediate frequency MF 300-3MHZ high frequency HF 3-30MHZ
VHF VHF 30-300MHZ (TV 1---12 channel) UHF UHF 300-3GHZ (TV 13 channel or more) UHF SHF 3G-30GHZ also has this division:
The frequency is divided according to the regulations, so that there is a professional communication language: Ultra-low frequency: 0.03-300Hz
Extremely low frequency: 300-3000Hz (audio) Very low frequency: 3-300KHz Long wave: 30-300KHz Medium wave: 300-3000KHz Short wave: 3-30 megaVHF: 30-300 mega high frequency: 300-3000 mega high Frequency: 3-30G Extreme high frequency: 30-300G Far infrared: 300-3000G
Two: performance unit conversion of commonly used electronic components1MHZ=106HZ 1GHZ=109HZ Capacitance symbol F (Fara)
1 method = 1000 millifarads (HF)
1 millifarad = 1000 microfarads (UF) = 10-3F
1 micro method = 1000 nanofarads (NF) = 10-6F
1 nanofarad = 1000 picofarads (PF) = 10-9F
China Mobile: GSM (2G), TD-SCDMA (3G); China Unicom: GSM (2G), WCDMA (3G); China Mobile: CDMA1X (2G), CDMA2000 (3G)
Unicom number: 130, 131, 132, 155, 156, 185, 186, 145 (net card)
Mobile number segment: 134, 135, 136, 137, 138, 139, 147, 150, 151, 152, 157, 158, 159, 182, 187, 188
Electrical signal segment: 189, 133, 180, 153, etc.
Hydraulic pump
Hydraulic motor
The hydraulic cylinder
Hydraulic valve
The supercharger
All components used in hydraulic systems.
Can be divided into:
Power components, such as hydraulic pumps.
Control components, such as relief valve, sequence valve, directional valve, etc.
Actuators, such as hydraulic motors, hydraulic cylinders.
Auxiliary parts, such as: fuel tank, pipeline, etc.
Hydraulic system: is composed of a variety of hydraulic components, auxiliary components, the components are distributed in each part of the equipment, they are organically connected by the pipeline, pipe joints, connectors and other parts can independently complete a variety of working conditions of the system.
Hydraulic Precision Parts,Steel Hydraulic Hose Fitting,Stainless Steel Hydraulic Hose Fitting,Carbon Steel Hydraulic Hose Fitting
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