How long does it take to apply for the electrician IC electrician certificate in Nancheng, Dongguan in 2016? Are there good training institutions?

Coupling generates current in the load loop, thereby obtaining a larger high-frequency signal voltage or power on the load. Otherwise, when the frequency of the input signal is greatly different from the resonant frequency, the high-frequency signal voltage or power obtained on the load will be smaller, which means that the circuit only amplifies signals within a certain frequency range, which reflects The frequency selection function of the tuned amplifier is added. Although a single-tuned amplifier has the advantages of simple circuit and easy adjustment, its selectivity is not good enough and it cannot solve the contradiction between passband and selectivity. In many practical circuits, such as high-frequency amplification and intermediate-frequency amplification circuits of televisions, frequency bandwidth and good selectivity are often required. At this time, it is impossible to use a single tuned amplifier, and a double tuned amplifier must be used
Contact

Teacher Li
Consultation phone number
br/>School name
Dongguan Guangyou Vocational Training School
Location
Address: Third Floor, Dongguan Bus Terminal East Station (Guangyou Education)
Guangyou Vocational School is open all year round
,
Learn electrician and send electrician exam practice software
Guangyou Education
Training goals
Start from scratch, guide students in all aspects, how to connect indoor and outdoor wires, emergency first aid and treatment of electric shock, electrician on-site Combination of operation and theory, safe operation, on-the-job operation and employment experience practice
Introduction to specific electrician training courses
Introduction to junior electrician training courses
Safe operation of electricians
Basic knowledge of electrical circuits< br/>Calculation of circuits
Serial, parallel and application of resistors
Alternating current, direct current
Single-phase alternating current, three-phase alternating current
Transformers, mutual inductors
Single-phase electricity meters , Three-phase ammeter
Motor
Use of electrical instruments
Multimeter
Megohmmeter
Current clamp meter
Ammeter
Voltmeter
Applications of low-voltage electrical appliances
Fuses
Knife switches
Circuit breakers
Contactors
Thermal relays
Intermediate relays
Time relays< br/>Button
Practical operation of lighting circuit
Practical operation of industrial power circuit
Motor forward control
Motor interlocking forward and reverse control circuit
Double interlocking forward and reverse control circuit Reverse control circuit
Workbench automatic reciprocating control circuit
Motor sequential start control circuit
Motor voltage starting control circuit
Intermediate electrician training course training content electrical control technology, electricians and electronics Basics, Maintenance Electrical Technology, Internal and External Line Electrical Technology,
Electrical Equipment Operation,
Transformer and Motor Operation and Maintenance Principles and Applications of Programmable Controllers,
Electricity
Gas measurement knowledge, practical operations, etc., advanced training content digital circuit technology, factory power transformation and distribution technology, factory electrical control technology,
programmable controller principle and application,
single chip microcomputer principle And practical technology,
rectification and inverter
technology, frequency converter principle and application technology, practical operation, etc.
The triode shown is a silicon tube. The resistor is the base resistor, and the resistor is the collector resistor. The base of the transistor acts as a control electrode, through which the switch opening and closing action is controlled. The collector and emitter form the two end points of the switch, and the opening and closing are controlled by the pole. , and the voltage at both ends is the output voltage of the switching circuit. ①When the input voltage is high level, the transistor is turned on, which is equivalent to the switch being closed, so the output voltage, that is, the output is low level, and the collector current /. ②When the input voltage is low level, the transistor is turned off, which is equivalent to the switch being turned off, so the collector current is obtained. The circuit consists of an input stage, an inverter stage, and an output stage. The input stage consists of multi-emitter transistors and resistors. The collector junction can be regarded as a diode, and the emitter junction can be regarded as two diodes back to back with the former. In this way, the function is exactly the same as that of a diode and a gate. The inverter stage consists of a triode and a resistor.