ICMF mining
Publish: 2021-03-27 01:02:07
1.
The newly started project can definitely make money
this is one of my works that is still rising today. Today's income is 138 yuan
2. M1 IC ID card
M1 is still relatively difficult to crack, and you can make ciphertext in one card and one secret sector by yourself
ic4442 is relatively easy to crack
ID and card are much easier to , but it is also the most secure and the most insecure because it completely depends on the database
M1 is still relatively difficult to crack, and you can make ciphertext in one card and one secret sector by yourself
ic4442 is relatively easy to crack
ID and card are much easier to , but it is also the most secure and the most insecure because it completely depends on the database
3. Very good!
4. IC mf525dw integrates printing, ing, scanning and fax
1. High speed double-sided printing, shorten the printing time of home page
2. Support various functions, add passport
3. Upgrade 5.0 inch color touch screen, more intuitive
for various operations
4. Intelligent scanning
5. Support correction deformation (trapezoidal) function
6. Airprint
7. Support USB direct printing
8 Energy saving and environmental protection
retail price: rmb8660
the price performance of big brands is good, so it is recommended to buy them
1. High speed double-sided printing, shorten the printing time of home page
2. Support various functions, add passport
3. Upgrade 5.0 inch color touch screen, more intuitive
for various operations
4. Intelligent scanning
5. Support correction deformation (trapezoidal) function
6. Airprint
7. Support USB direct printing
8 Energy saving and environmental protection
retail price: rmb8660
the price performance of big brands is good, so it is recommended to buy them
5. It should be similar to the transfer in process of bit era trading platform
6. Basic knowledge of electronics section 1 Identification of common components I. resistance is represented by "R" and number in the circuit, for example, R15 represents resistance with number 15. The main functions of resistor in the circuit are shunt, current limiting, voltage dividing, bias, filtering (combined with capacitor) and impedance matching. 1. Parameter identification: the unit of resistance is Ohm Ω， The unit of magnification is: kiloohm (k) Ω， Megaohm (m) Ω And so on. The conversion method is: 1 megaohm = 1000 kiloohm = 1000000 ohm. There are three methods for parameter marking of resistance, namely direct standard method, color standard method and number standard method. a. The number standard method is mainly used for small volume circuits such as SMT, for example, 472 stands for 47 × one hundred and two Ω 7 K); 104 indicates that 100kb, color ring marking method is used most, and the examples are as follows: four color ring resistance, five color ring resistance (precision resistance) 2. The relationship between color mark position and magnification of resistance is shown in the table below: the allowable deviation of effective number magnification of color (%) / 10-2 ± 10 gold / 10-1 ± 5 black 0 100 / Brown 1 101 ± 1 red 2 102 ± 2 Orange 3 103 / yellow 4 104 / Green 5 105 ± 0.5 Blue 6 106 ± 0.2 purple 7 107 ± 0.1 gray 8 108 / white 9 109 + 5 to - 20 colorless // ± 2. Capacitance 1. Capacitance is generally represented by "C" plus number in the circuit (e.g. C25 refers to the capacitance numbered 25). Capacitance is made up of two pieces of metal film close to each other and separated by insulating material. The main characteristic of capacitance is to separate direct current from alternating current. The size of the capacitance is the size of the stored electric energy. The blocking effect of the capacitance on the AC signal is called capacitive reactance, which is related to the frequency and capacitance of the AC signal. Capacitive reactance XC = 1 / 2 π F C (F is the frequency of the AC signal, C is the capacitance) the types of capacitors commonly used in telephone include electrolytic capacitor, ceramic chip capacitor, chip capacitor, single stone capacitor, tantalum capacitor and polyester capacitor. 2. Identification method: the identification method of capacitance is basically the same as that of resistance, which is divided into three methods: direct standard method, color standard method and digital standard method. The basic unit of capacitance is expressed in farad (f), and other units are: millifahrenheit (MF), micro Fahrenheit (UF), nano Fahrenheit (NF) and Pico Fahrenheit (PF). Among them: 1 farad = 103 Ma = 106 micro FA = 109 nanofa = 1012 Pico FA, the capacity value of the capacitance with large capacity is directly indicated on the capacitance, for example, the capacity value of the capacitance with small capacity of 10 UF / 16V is represented by letters or numbers. Letter representation: 1m = 1000 UF 1P2 = 1.2pF 1n = 1000pf digital representation: generally, the capacity is represented by three digits, and the first two digits are significant digits, The third digit is the multiplier. For example, 102 means 10 × 102pf = 1000pf 224 means 22 × 104pf = 0.22 UF3, allowable error of capacitance error table symbol F G J K L M ± 1% ± 2% ± 5% ± 10% ± 15% ± If the capacitance of a ceramic chip is 104j, it means that the capacity is 0.1 UF and the error is 0 ± 5% 4. Fault characteristics in the actual maintenance, the main performance of capacitor faults are: (1) open circuit fault caused by pin corrosion 2) Open circuit fault of desoldering and false soldering 3) Small capacity or open circuit fault caused by liquid leakage 4) Leakage, serious leakage and breakdown fault. 3、 Crystal diodes crystal diodes are usually represented by "d" and numbers in the circuit, such as: D5 represents the diode with number 5. 1. Function: the main characteristic of diode is unidirectional conctivity, that is, the conction resistance is very small under the action of forward voltage; However, under the action of reverse voltage, the on resistance is maximum or infinite. Because diode has the above characteristics, it is often used in the circuits of rectification, isolation, voltage stabilization, polarity protection, coding control, frequency molation and squelch in cordless telephone. The crystal diodes used in telephone can be divided into rectifier diodes (such as 1N4004), isolation diodes (such as 1N4148), Schottky diodes (such as BAT85), light-emitting diodes, voltage stabilizing diodes, etc. 2. Identification method: the identification of diodes is very simple. The N-pole (negative pole) of low-power diodes is mostly marked with a color circle on the surface of diodes. Some diodes also use the special symbol of diodes to indicate the P-pole (positive pole) or N-pole (negative pole). Some diodes also use the symbol mark of "P" and "n" to determine the polarity of diodes. The positive and negative poles of the LED can be identified by the length of the pin. The long pin is positive and the short pin is negative. 3. Precautions for testing: when using the digital multimeter to test the diode, the red probe is connected to the positive pole of the diode, and the black probe is connected to the negative pole of the diode. At this time, the measured resistance is the positive conction resistance of the diode, which is just the opposite to that of the pointer multimeter. 4. The commonly used 1n4000 series diode withstand voltage comparison is as follows: model 1N4001 1N4002 1N4003 1N4004 1N4005 1N4006 1N4007 withstand voltage (V) 50 100 200 400 600 800 1000
current (a) are all 1 4, zener diode in the circuit commonly used "ZD" plus digital expression, such as: zd5 represents the No. 5 Zener tube. 1. Principle of voltage stabilizing diode: the characteristic of voltage stabilizing diode is that after breakdown, the voltage at both ends of the diode basically remains unchanged. In this way, when the regulator is connected to the circuit, if the voltage of each point in the circuit changes e to the fluctuation of the power supply voltage or other reasons, the voltage at both ends of the load will basically remain unchanged. 2. Fault characteristics: the fault of voltage stabilizing diode is mainly manifested in open circuit, short circuit and unstable voltage stabilizing value. Among the three kinds of faults, the first one shows the increase of power supply voltage; The latter two kinds of faults show that the power supply voltage becomes low to zero or the output is unstable. The types and voltage stabilizing values of commonly used voltage stabilizing diodes are shown in the following table: type 1n4728 1n4729 1n4730 1n4732 1n4733 1n4734 1n4735 1n4744 1n4750 1n4751 1n4761 voltage stabilizing value 3.3V 3.6V 3.9v 4.7V 5.1V 5.6v 6.2V 15V 27V 30V 75V 5. Inctance is often expressed by "L" plus numbers in the circuit, such as: l6 represents inctance with number 6. The inctance coil is made by winding the insulated wire on the insulated frame for a certain number of turns. DC can pass through the coil, DC resistance is the resistance of the wire itself, the voltage drop is very small; When the AC signal passes through the coil, the self inced electromotive force will be generated at both ends of the coil. The direction of the self inced electromotive force is opposite to the direction of the applied voltage, which hinders the passage of AC. therefore, the characteristic of the inctor is DC resistance AC. the higher the frequency, the greater the coil impedance. Inctor and capacitor can form oscillation circuit in the circuit. Inctance has direct standard method and color standard method, which is similar to resistance. For example, brown, black, gold and gold represent the inctance of 1uh (error 5%). The basic unit of inctance is: H, and the conversion unit is: 1H = 103mh = 106uh. 6、 Varactor diode varactor diode is a kind of special diode designed according to the principle that the capacitance of PN junction in common diode can change with the change of applied reverse voltage
in cordless telephone, varactor is mainly used in the high frequency molation circuit of mobile phone or landline to molate low frequency signal to high frequency signal and transmit it. In the working state, the molation voltage of the varactor diode is usually applied to the negative electrode, so that the capacitance of the internal junction of the varactor diode changes with the molation voltage. The failure of varactor diode is mainly manifested as leakage or poor performance: (1) when leakage occurs, the high frequency molation circuit will not work or the molation performance will be poor 2) When the varactor performance becomes worse, the high-frequency molation circuit is unstable, which makes the molated high-frequency signal distorted when it is sent to the other party and received by the other party. In case of one of the above situations, the varactor diode of the same model should be replaced. 7、 Crystal triode crystal triode in the circuit commonly used "Q" plus a number, such as: Q17 for the number of 17 triode. 1. Features: crystal triode (referred to as triode) is a special device with two PN junctions and amplification capability. It is divided into two types: NPN type and PNP type. The working characteristics of these two types of triodes can complement each other. The so-called pair transistor in OTL circuit is paired by PNP type and NPN type
the commonly used PNP triodes in telephone sets are: a92, 9015, etc; NPN type triodes are: A42, 9014, 9018, 9013, 9012 and other models. 2. Crystal triode is mainly used in amplifying circuit, there are three kinds of connection in common circuit. In order to facilitate comparison, the characteristics of the three transistor connection circuits are listed in the table below for your reference. Common emitter circuit common collector circuit common base circuit input impedance (hundreds of to thousands of) large (tens of thousands of) small (tens of to tens of) output impedance (thousands of to tens of) small (tens of to tens of) large (tens of to hundreds of) voltage amplification Small (less than 1 and close to 1) large current amplification factor large (tens of) large (tens of) small (less than 1 and close to 1) large power amplification factor (about 30-40 dB) small (about 10 dB) medium (about 15-20 dB) frequency characteristics high frequency difference table application Multi stage amplifier, intermediate stage, low-frequency amplifier, input stage, output stage, or high-frequency or wide-band circuit and constant current source circuit for impedance matching 3. On line measurement in actual maintenance, the triode has been installed on the circuit board, it is a troublesome thing to remove each one for measurement, and it is easy to damage the circuit board, I summed up a method to judge the fault by measuring the working state of triode on the circuit, for your reference: category fault location test points E-B pole open circuit ved & gt; 1V ved = V + E-B pole short circuit, veb = 0V VCD = 0V VBD rise, re open circuit, ved = 0V Rb2 open circuit, VBD = ved = V + Rb2 short circuit, ved is about 0.7V, RB1 increases a lot, open circuit, VEC & lt; When 0.5V VCD increases, E-C open circuit between poles veb = 0.7V VEC = 0V VCD increases, B-C open circuit between poles veb = 0.7V ved = 0V, B-C short circuit between poles VBC = 0V VCD is very low, RC open circuit VBC = 0V VCD increases, VBD does not change, Rb2 resistance increases, many ved is about V + VCD is about 0V, ved voltage instability, triode and surrounding components have false soldering fault Key points of bit test RB1 open circuit VBE = 0 VCD = V + ved = 0 RB1 short circuit VBE is about 1V ved = v-vbe Rb2 short circuit VBD = 0V VBE = 0V VCD = V + re open circuit VBD increases VCE = 0V VBE = 0V re short circuit VBD = 0.7V VBE = 0.7V
RC open circuit VCE = 0V VBE = 0.7V ved is about 0V C-E extremely short circuit VCE = 0V VBE = 0.7V When ved increases, B-E pole open circuit VBE & gt; 1V ved = 0V VCD = V + B-E pole short circuit VCE is about V + VBE = 0V VCD is about 0V C-B pole open circuit VCE = V + VBE = 0.7V ved = 0V C-B pole short circuit VCB = 0V VBE = 0.7V VCD = 0V eight, field effect transistor amplifier 1, field effect transistor has the advantages of high input impedance and low noise, so it is also widely used in all kinds of electrical devices
current (a) are all 1 4, zener diode in the circuit commonly used "ZD" plus digital expression, such as: zd5 represents the No. 5 Zener tube. 1. Principle of voltage stabilizing diode: the characteristic of voltage stabilizing diode is that after breakdown, the voltage at both ends of the diode basically remains unchanged. In this way, when the regulator is connected to the circuit, if the voltage of each point in the circuit changes e to the fluctuation of the power supply voltage or other reasons, the voltage at both ends of the load will basically remain unchanged. 2. Fault characteristics: the fault of voltage stabilizing diode is mainly manifested in open circuit, short circuit and unstable voltage stabilizing value. Among the three kinds of faults, the first one shows the increase of power supply voltage; The latter two kinds of faults show that the power supply voltage becomes low to zero or the output is unstable. The types and voltage stabilizing values of commonly used voltage stabilizing diodes are shown in the following table: type 1n4728 1n4729 1n4730 1n4732 1n4733 1n4734 1n4735 1n4744 1n4750 1n4751 1n4761 voltage stabilizing value 3.3V 3.6V 3.9v 4.7V 5.1V 5.6v 6.2V 15V 27V 30V 75V 5. Inctance is often expressed by "L" plus numbers in the circuit, such as: l6 represents inctance with number 6. The inctance coil is made by winding the insulated wire on the insulated frame for a certain number of turns. DC can pass through the coil, DC resistance is the resistance of the wire itself, the voltage drop is very small; When the AC signal passes through the coil, the self inced electromotive force will be generated at both ends of the coil. The direction of the self inced electromotive force is opposite to the direction of the applied voltage, which hinders the passage of AC. therefore, the characteristic of the inctor is DC resistance AC. the higher the frequency, the greater the coil impedance. Inctor and capacitor can form oscillation circuit in the circuit. Inctance has direct standard method and color standard method, which is similar to resistance. For example, brown, black, gold and gold represent the inctance of 1uh (error 5%). The basic unit of inctance is: H, and the conversion unit is: 1H = 103mh = 106uh. 6、 Varactor diode varactor diode is a kind of special diode designed according to the principle that the capacitance of PN junction in common diode can change with the change of applied reverse voltage
in cordless telephone, varactor is mainly used in the high frequency molation circuit of mobile phone or landline to molate low frequency signal to high frequency signal and transmit it. In the working state, the molation voltage of the varactor diode is usually applied to the negative electrode, so that the capacitance of the internal junction of the varactor diode changes with the molation voltage. The failure of varactor diode is mainly manifested as leakage or poor performance: (1) when leakage occurs, the high frequency molation circuit will not work or the molation performance will be poor 2) When the varactor performance becomes worse, the high-frequency molation circuit is unstable, which makes the molated high-frequency signal distorted when it is sent to the other party and received by the other party. In case of one of the above situations, the varactor diode of the same model should be replaced. 7、 Crystal triode crystal triode in the circuit commonly used "Q" plus a number, such as: Q17 for the number of 17 triode. 1. Features: crystal triode (referred to as triode) is a special device with two PN junctions and amplification capability. It is divided into two types: NPN type and PNP type. The working characteristics of these two types of triodes can complement each other. The so-called pair transistor in OTL circuit is paired by PNP type and NPN type
the commonly used PNP triodes in telephone sets are: a92, 9015, etc; NPN type triodes are: A42, 9014, 9018, 9013, 9012 and other models. 2. Crystal triode is mainly used in amplifying circuit, there are three kinds of connection in common circuit. In order to facilitate comparison, the characteristics of the three transistor connection circuits are listed in the table below for your reference. Common emitter circuit common collector circuit common base circuit input impedance (hundreds of to thousands of) large (tens of thousands of) small (tens of to tens of) output impedance (thousands of to tens of) small (tens of to tens of) large (tens of to hundreds of) voltage amplification Small (less than 1 and close to 1) large current amplification factor large (tens of) large (tens of) small (less than 1 and close to 1) large power amplification factor (about 30-40 dB) small (about 10 dB) medium (about 15-20 dB) frequency characteristics high frequency difference table application Multi stage amplifier, intermediate stage, low-frequency amplifier, input stage, output stage, or high-frequency or wide-band circuit and constant current source circuit for impedance matching 3. On line measurement in actual maintenance, the triode has been installed on the circuit board, it is a troublesome thing to remove each one for measurement, and it is easy to damage the circuit board, I summed up a method to judge the fault by measuring the working state of triode on the circuit, for your reference: category fault location test points E-B pole open circuit ved & gt; 1V ved = V + E-B pole short circuit, veb = 0V VCD = 0V VBD rise, re open circuit, ved = 0V Rb2 open circuit, VBD = ved = V + Rb2 short circuit, ved is about 0.7V, RB1 increases a lot, open circuit, VEC & lt; When 0.5V VCD increases, E-C open circuit between poles veb = 0.7V VEC = 0V VCD increases, B-C open circuit between poles veb = 0.7V ved = 0V, B-C short circuit between poles VBC = 0V VCD is very low, RC open circuit VBC = 0V VCD increases, VBD does not change, Rb2 resistance increases, many ved is about V + VCD is about 0V, ved voltage instability, triode and surrounding components have false soldering fault Key points of bit test RB1 open circuit VBE = 0 VCD = V + ved = 0 RB1 short circuit VBE is about 1V ved = v-vbe Rb2 short circuit VBD = 0V VBE = 0V VCD = V + re open circuit VBD increases VCE = 0V VBE = 0V re short circuit VBD = 0.7V VBE = 0.7V
RC open circuit VCE = 0V VBE = 0.7V ved is about 0V C-E extremely short circuit VCE = 0V VBE = 0.7V When ved increases, B-E pole open circuit VBE & gt; 1V ved = 0V VCD = V + B-E pole short circuit VCE is about V + VBE = 0V VCD is about 0V C-B pole open circuit VCE = V + VBE = 0.7V ved = 0V C-B pole short circuit VCB = 0V VBE = 0.7V VCD = 0V eight, field effect transistor amplifier 1, field effect transistor has the advantages of high input impedance and low noise, so it is also widely used in all kinds of electrical devices
7. I'm much worse than you. I just want to transfer bitcoin in the morning. It's usually two hours. I bought it at 10:00 a.m., but it hasn't been put forward yet, and it can't be cancelled! Bitcoin China didn't handle my withdrawal, which caused me to lose more than 8000 yuan.
8. Bitcoin is a virtual currency, not the previous currency of China, which can't be put forward.
9. The analysis of jinwowo network technology is as follows:
a block is a collection of many transaction data, which is marked with a time stamp and a unique mark of the previous block
effective blocks will be added to the main blockchain after gaining the consensus of the whole network
blockchain is a data structure in which blocks containing transaction information are orderly linked from back to front.
a block is a collection of many transaction data, which is marked with a time stamp and a unique mark of the previous block
effective blocks will be added to the main blockchain after gaining the consensus of the whole network
blockchain is a data structure in which blocks containing transaction information are orderly linked from back to front.
10.
As an implementation of architecture design, blockchain is quite different from basic language or platform. Blockchain is the technology behind cryptocurrency, and it is one of the most popular technologies compared with vr virtual reality. It is not a new technology in itself, similar to Ajax. It can be said that it is a technical architecture, so we talk about the technical implementation of blockchain from the perspective of architecture design. No matter what programming language you are good at, you can refer to this design to implement a blockchain proct. At the same time, combing the related knowledge map and system, to help you learn and research systematically
in terms of architecture design, blockchain can be simply divided into three layers: protocol layer, extension layer and application layer. Among them, the protocol layer can be divided into storage layer and network layer, which are independent but inseparable from each other
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