Guangzhou 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. The following information is for reference article there is a single-chip oscillator is used to form a high-gain inverting amplifier. Pin XTA L and XTA L are the amplifier input terminal and an output terminal. This amplifier with a feedback element chip crystal resonator together constitute a self-excited oscillator. External crystal resonator and the capacitor C and C form a parallel resonant circuit connected to the feedback loop of the amplifier. On the external capacitor value although not strictly required, but will affect the size of the capacitor high and low frequency oscillator, oscillator stability, start-up voice repeater chip voice recording technology in the application of the speed and temperature stability . Therefore, this system is the crystal oscillator circuit should be possible to select MHz capacitance ceramic capacitors, the capacitance value of approximately μF soldering printed circuit boards, crystal oscillator and capacitors should be mounted so close with the single chip to reduce parasitic capacitance oscillator stability and better ensure reliably. Reset system circuit is reset by the external reset circuit to achieve on-chip reset circuit is reset pin RST through a Schmitt trigger and reset circuit connected to the Schmitt trigger is used to suppress the noise, the output of each machine cycle SP sampled once by the reset circuit. Power-on reset circuit usually automatic reset button to reset the two ways, the system used in this circuit and the power button to reset the circuit, as shown. When the clock frequency selection MHz, C take μFRs about Ω, Rk about K Here are the minimum system schematic. Figure smallest single-chip microcontroller system voice repeater voice recording technology in the application of the motor control and drive circuit design two, H bridge motor control and drive circuit design, schematic diagram of a DC motor DC motor working within the structure of which is to analyze the physical DC motor model diagram. Among them, a magnet fixed points, herein referred to as the main pole fixed points and brush. Rotation of a ring around the annular core and the winding core. Which is to facilitate the small circle indicates the position of the conductor potential or current direction and set up a station on the map indicates the most simple Guangzhou learning machine to join, select school and the first national brand