Zhanjiang learning machine to join, select the school and the first national brand to buy a "learning and the first" National Machine beneficiary families, they say: Shenzhen Small-kun (7 year old boy) mother: Great! To read through Sinology become very, very loose, I had spent a lot of money to buy a lot of sets of discs, there are no set is complete, wear flowers, lost, and stuck out of play. This Sinology machine, and everything the whole, I finally freed from the CD inside it. Fujian vast (three year old boy) father: the child's mother is doing Early Learning Center, we have been the classic sense, although the child hears finished "Rules", "Three Character Classic", but the machine still surprise us Sinology content too rich! Listen now round the child, nor even watched television. Now, I have to not go to school and the first Sinology machine Fujian agent, goods sent back, ten days for the sale of more than one hundred units, have never done such a good promotion products. Xiangtan - Zheng: I every day in the classroom, playing 20 minutes at noon Classic, a semester later, our class children, in memory, reading and writing have improved to varying degrees, the area where the speech contest, a prize, second prize are the kids in our class. This is a pleasant surprise, we did not think Sinology machine class kids more standard pronunciation, speech more appealing up! Learning and First Technology Co., Ltd. mainly produces electronic products, audio materials, communications equipment, and other educational products. Domestic and international sales. Over the years our products with its powerful, reliable quality, stable performance is known, the majority of users and dealers who praise. School and the first technology to provide customers with reliable products and fast scientific quality service. Let early education, Chinese culture and other fields of science and technology possible. Composed of the following articles for information purposes only and relationships. Third, the unit circuit design, parameter calculation, and during selected according to the functional block diagram of the system of indicators and clear the sub-tasks for each unit circuit design, parameter calculation and device selection. Unit circuit design unit circuit is a sub-machine, only to the module circuit designed to improve the whole design level. Each unit circuit design are required before the unit circuit clear mandate to elaborate a unit circuit performance indicators, and the relationship between the before and after class to analyze the composition of the circuit form. Specifically designed to mimic the transfer of advanced circuits can also be innovative or improved, but they must ensure that the performance requirements. Moreover, not only the unit circuit itself to rational design, each unit should be co-ordination between circuits, pay attention to all of the input signal, the output signal and the control signal relationship. To ensure the unit circuit parameter calculation to achieve functional index requirements, technical knowledge is required to use electronic voice repeater chip voice recording technology in the application of the parameters are calculated. For example, the resistance value of each amplification circuit, the calculation of magnification oscillator resistor, a capacitor, the oscillation frequency and other parameters of the calculation. Only good understanding of the operation of the circuit, the correct use of the formula, the calculated parameters to meet the design requirements. Parameter calculation, the same circuit may have several sets of data can be selected from a set of functions required to complete the circuit design, in practice the parameters can truly viable. Calculating circuit parameters should pay attention to the following issues components operating current, voltage, frequency and power parameters such indicators should be able to meet the requirements of the circuit components must be adequate limit parameters ample amount should generally be greater than the rated value. Times the resistance and capacitance parameters should be selected close to the nominal value of the calculated value. Selection element selection device RC many types of resistors and capacitors, resistors and capacitors correct choice is important different resistance and capacitance circuit performance requirements are different, solvability circuit capacitor leakage requirements are very strict, and some circuit resistance the capacitor performance and capacity Zhanjiang learning machine to join, and the first choice school, national brand