RE3209 320X90X311 Aluminum enclosure

RE3209 320X90X311 Aluminum enclosure
http://www.siliconray.com/re3209-320x90x311-aluminum-enclosure.html

Outside Dimension:   W x H x L = 320mm x 90mm x 311mm(13''x4''x13'')
Inside Dimension:      W x H x L = 220mm x 85mm x 300mm(9''x3.5''x12'')
Material:                      Aluminum
Front Thickness:          8mmBack Thickness:          3mm
Finish:                         Brushed, hard anodized
Net Weight:                 5.2kg

TDA7297-Mini 15Wx2 Audio Amplifier Board

TDA7297-Mini 15Wx2 Audio Amplifier BoardA mini 15Wx2 board designed with TDA7297
Features- Designed with TDA7297
http://www.siliconray.com/tda7297-mini-15wx2-audio-amplifier-board.html
- Very small size
- Single 12V power supply
- 15W x 2 max output power

DSP development board function

DSP development board function
http://www.siliconray.com/development-boards/ti-dsp/bp5509-02-tms320vc5509-development-board.html
DSP development board, is the function of the research and development on DSP, used in the development of digital signal processor (DSP) launch circuit board, and provide the principle diagram and the source code to the customer. DSP especially in TI company's DSP market share is the largest, have very widely customer base. In the DSP development board, Beijing road and vertical and horizontal technology Co., LTD. (the house of development board) introduced a Easy series DSP development board, including Easy2812
http://development-board.blogspot.com/2012/02/how-to-buy-scm-development-board.htmldevelopment board, Easy5509 development board, especially suitable for the students to learn to use. Also introduced QQ series development board, including QQ2812 development board, QQ5509 development board, suitable for company researchers use. Consumer demand auxiliary driving system with advanced technology need precision functions and the size and shape of very small high reliability components. Because these system size is small, and is very close to each other, so also requires ?

DSP development board profile

DSP development board profile
http://www.siliconray.com/development-boards/ti-dsp.html
Development board, is aimed at a chip to the chip as the core, the function of the chip will have extended out, will every part of the function through procedure demonstrate out. At the same time, provide the source program and the principle diagram, so that customers can with the minimum price, the fastest speed to learn the use of the chip, to twice the result with half the effort. DSP, is a digital signal processor. Usually used for data processing algorithm, compared with other processor, its strong data processing power and speed, assembly line structure is its biggest characteristic.

DSP development board

DSP development board
http://development-board.blogspot.com/2012/02/how-to-quick-and-good-learning-arm-have.html
DSP similar filter kinds of experimental is in matlab simulation can, do not need to buy what the development board, if is the image processing of? Need not to need to buy development board
If just algorithm, not dealing with external interface with matlab simulation
If need acquisition or output, had better be in development board
BoHang embedded development board has various kinds of DSP development board

The power modules output current choice

The power modules output current choice
http://www.siliconray.com/tube-6n8p-mosfet-hybrid-hifi-audio-amplifier.html
Because of switch power supply, high working efficiency, and generally can achieve 80% above, therefore, in its output current choice, should be measured accurately or calculation of maximum absorption current electric equipment, in order to make the switch power supply Is adopted with high ratio of performance to price, usually output computation formula Is: Is = KIf type: Is--of switch power supply output current ratings; If-electrical equipment maximum absorption current; K-allowance coefficient, generally take 1.5 ~ 1.8;
Edit this paragraph 3.3 protection circuit
Switching power supply for design must be with the flow, heat, short circuit protection function etc, so in the design should be preferred protection function complete switch power supply module, and the protection circuit technology parameters should be and electrical equipment work characteristics match, in order to avoid damage or electrical equipment

Dc chopper

Dc chopper
http://www.siliconray.com/
DC/DC transform is variable DC voltage transform to a fixed DC voltage, also known as DC chopper. The chopper sensor means has two, one is the pulse width modulation way Ts unchanged, change ton (general), 2 it is frequency modulation (1) Buck circuit--the chopper Buck, the output voltage U0 less than average input voltage Ui, the same polarity. (2) Boost circuit--the booster chopped, and its output voltage is greater than the average U0 input voltage Ui, the same polarity. (3) Buck-Boost circuit--step-down or Boost the chopper device, the output voltage U0 or greater than the average less than the input voltage Ui, the reverse polarity, inductance transmission. (4) Cuk circuit--or the chopper boost blood pressure, the average electricity output
The greater or less than the pressure U0 input voltage Ui, the reverse polarity, capacitance transmission. And Sepic, Zeta circuit. The above for the isolation type DC-DC converter circuit, the isolation type DC-DC converter is shock circuit, a flyback circuit, half bridge circuit, the whole bridge circuit, mosfet circuits. Today's soft switch technology makes DC/DC happen a qualitative leap, the United States VICOR company designs the manufacture various ECI soft switch DC/DC converter, and its maximum output power 300 W, 600 W, 800 W, etc, the corresponding power density for (6.2, 10, 17) W/cm3, efficiency as the (80 ~ 90) %. Japan TDK-Lambda company launched a new soft switch technology using high frequency switching power supply module RM series, the switch frequency for (200 ~ 300) kHz, power density has reached W/cm3 27, the synchronous rectifier (MOSFET instead of the schottky diodes), make the whole circuit ? efficiency

Power supply module

Power supply module
http://www.siliconray.com/500w-12v-to-45v-car-audio-power-supply-module.html
Generally speaking, this class module called load point (POL) power supply system or using a power supply system (PUPS). Because of the advantages of modular structure very much, therefore module power is widely used in the exchange equipment, access devices, mobile communications, microwave communication and optical transmission, routers and other communications field and automobile electronics, aerospace and other. Especially in recent years due to the rapid development of data services and the further promotion of distributed power supply system, module power supply growth is more than a power supply. Along with the semiconductor technology, encapsulation technology and high frequency the wide use of soft switch, module power supply power density is more and more big, the conversion efficiency more and more high, application is also more and more simple.
People in the switch power technology is the development of related edge of power electronics device, the side development
Love pu electronic power supply module (4 zhang) switch frequency conversion technology, both to promote each other push switch power for more than a year two digital growth toward light, small, thin, low noise and high reliability, anti-interference direction. Switching power supply can be divided into the AC/DC and DC/DC two kinds big, DC/DC converter is now realize modular, and design technology and production process at home and abroad are mature and standardization, and has set up a file users receive the recognition, but the AC/DC modular, because of its own characteristics in the process of makes modular, meet more complex technology and process manufacturing. The following are two kinds of switch power supply structure and characteristics in this paper

DSP system design process

DSP system design process
http://www.siliconray.com/bp28335-01-tms320f28335-development-board.html

In the design of DSP system before, must first according to the goal of application system to determine the system performance index, signal processing requirements, normally available data flow chart, mathematical operation sequence, formal symbol or natural language to describe. The second step is to according to the requirements of the system for the simulation of a high-level language. Generally speaking, in order to achieve the ultimate goal of the system, the need to input signal for proper treatment, and the different processing methods will result in different system performance, and to get the best system performance, in this step must be sure the best treatment methods, namely the digital signal processing algorithm (Algo rithm), so this step also called algorithm simulation stage. For example, voice compression algorithm is to determine the compression ratio condition, won best ?
After completion of the second step in, then can design real-time DSP system, the design of the real-time DSP system including the hardware design and software design two aspects. Hardware design according to the first system of the size of the computation of operation, the accuracy requirement of the system cost, restrictions, and volume, power requirements to choose the appropriate DSP chip. Then DSP chip design the periphery of the circuit and other circuit. The software design and programming mainly based on the system requirements and selected digital signal processor (DSP) write corresponding DSP assembler, if the system is not a high-level language and quantity of compiler support, also can use advanced language (such as C) programming. Due to the existing advanced language compiler efficiency than manual writing assembly language efficiency, therefore in the actual application system often use advanced language and ?
System software and hardware debugging respectively after completion, can the software from development system and direct application system in operation. Of course, DSP system development, especially the software development is a need to the repeated process, even though through the algorithm simulation basically can know real-time system performance, but in fact the simulated environment can not do it and real-time system environment is the same, and will be transplanted into real-time simulation algorithms system must be considered whether to real-time operation of the algorithm. If the computational complexity is too big can't in hardware running in real time, must be redone or simplified algorithm.

DSP advantages and disadvantages

DSP advantages and disadvantages
http://www.siliconray.com/bp5509-02-tms320vc5509-development-board.html
DSP advantages
The components of the tolerance values not sensitive, by temperature, environment and other external factors affecting small; Easy to realize the integration; VLSI can timeshare reuse, sharing processors; To adjust the coefficients of the processor realize adaptive filter; Can simulate the processing can't function of the realization of the: linear phase, sampling rate processing, cascade, easy to store, etc.; Can be used for very low frequency of the signal.
DSP faults
Need modulus transformation; By sampling frequency the limit, processing frequency range is limited; Digital system of power consumption by active components, no passive equipment and reliable. But the advantages than shortcomings.

DSP microprocessor

DSP microprocessor
http://www.siliconray.com/development-boards/ti-dsp.html
DSP (digital signal processor) is a unique microprocessor, is a digital signal to deal with a large quantity of information devices. Its working principle is to receive analog signals, converted to 0 or 1 digital signal. Again to digital signal modify or delete, strengthening, and in other systems of digital data interpretation the chip to simulate data or the actual environment format. It is not only a programmable sex, and in fact slide may run at speeds of up to ten million instructions per second article of complex procedures, far more than general microprocessors, digital electronic world is increasingly important computer chips. Its powerful data processing ability and high speed, is the most admirable two characteristics. DSP microprocessor (chip) generally has the following characteristics: (1) in an instruction cycle ?

51 SCM simulator and 51 SCM development board have what differentiation

51 SCM simulator and 51 SCM development board have what differentiation
http://www.siliconray.com/catalogsearch/result/?q=51

Hello, microcontroller simulator is said has become the product has been in development with. As the system application. And single-chip microcomputer development board is has not become a application of basic components products just need development program. This is the main difference. I hope it can help you.
51 simulator for single-chip microcomputer lovers is learning single-chip microcomputer and learn to use KEIL C51 developed software. 51 simulation implement use a SST89C58 microcontroller to realize simulation function, fired through a serial port and PC connection. The user can development is less than or equal to 28 K program. 51 simulator user application board directly into the position of the MCU. 51 simulator main performance: directly support KEIL C51 IDE development simulation environment. Can a single step, breakpoint, run at full speed of debugging; Can reference variables, RAM variables. Support assembly, C language mixed debugging. 28 K pieces (space program can at any time for the online program updates. Completely simulation P0, P2 mouth. The simulation frequency 6-33 MHz crystals optional, system configuration 11.0592 MHz. Can the standard 89 C51 simulation, 89 C52, 89 C58 to wait all the kernel's 51 single-chip microcomputer. 51 simulators occupy

51 single-chip microcomputer and development board is what relation? How to use?

51 single-chip microcomputer and development board is what relation? How to use?
8051 51 SCM is a eight micro controller chip, it is the core component of 51 development board, SCM development board is commonly used the periphery of the single chip microcomputer integrated into the device on a circuit board, and SCM together make up a development system, can be in development board by writing to a program to control the device implements around corresponding function, to study the purpose of the single chip microcomputer. Specific usage of different development board be different, but they are usually need to be connected to a computer to have some serial port driver (serial used to download a program to SCM). Cross-examine me interested in this, but I get on one, what more do not understand, and the related books about ah of what simply do not understand!!!!! I should where to start?
Answer because you just ?

Want to learn 51 SCM please recommend a single-chip microcomputer development board

Want to learn 51 SCM please recommend a single-chip microcomputer development board
Want to learn 51 SCM, don't know what to buy good development board, taobao many, various types of all have, and takes the color, don't know which to buy. Buy any of the recommended a development board, had better be practical, incidental tutorial easily to learn, can do more than the best. In addition to recommend the practical intro book better, thank you. Problems added:
http://www.siliconray.com/thumb-usb-stc-8051-mcu-programmer-1.html
Color is not useful? As is common LCD practical.
General flowing water lamp, digital tube, matrix keyboard, independent keyboard, liquid crystal, a buzzer, the I2C is about the same, all get through to the single chip is about introduction, the practicality of the color is not big, general test plate on the 8 * 8 dot matrix also can show simple letters Numbers...
As for the book, GuoTianXiang recommend the new concept 51 SCM C language tutorial, introduction, improve, the development, the development QuanGongLve"
Hope that the above information will help you

Two transistor constitute a constant current source can drive power

Two transistor constitute a constant current source can drive power
http://www.siliconray.com/instrument.html
In lighting lamps and lanterns and the battery charger is inseparable from the constant current source circuit. The appended drawings is with two PNP transistor and four resistors constant current source circuit, through choosing high power transistor and heat sink can make constant current reached more than 1 A.
The transistor Tr1 and resistance R1, R4, R2 composition main circuit. R2 and R4 series of the transistor Tr1 base after the bias resistors. When the power is connected later, because of current flow in the base, there will be in Tr1 collector current flowing emitter current flows through R1 in R1 ends after will produce voltage drop. When R1 on both ends of the voltage drop to 0.6 V, Tr2 will then conductivity, Tr2 collector current flows through the R2. On the base of current form Tr1 shunt. Tr1's base will also reduce the current, collector current also will decrease. So after Tr2 conduction

Beginners required: a practical method of the electronic technology

Beginners required: a practical method of the electronic technology
Concave mirror finishing electronic editor:
http://www.siliconray.com/development-tools.html
A, the theoretical study can be "natural"
Attention conclusion. The theoretical analysis process often esoteric to understand, but the conclusion is clear, pay attention to the conclusion, can avoid the image, the straight take the essence.
Analysis diagram. The block diagram of the electronic equipment out clear structure and the signal to. If can skilled analysis diagram, can be in dealing with problems do fairly well, rapid judge fault lies.
Pay attention to outside characteristics. The performance characteristics of the components or circuit functions, parameters, tube feet take method, etc. Master the characteristics, can not understand the characteristics in, by the use of these components or circuit.
Learn to estimate. Estimation can help their learning ?

Stc51 burn to write programs for help

Stc51 burn to write programs for help
http://www.siliconray.com/
I welding the boards, how burned write and burned writing not go in, doubt reset circuit has a problem, using a multimeter to reset the lead feet, a 2.878 v, I didn't kill the power directly the reset line drawn, the results were so will burn write in, then, I didn't add reset circuit, to burn to write programs, also can burn in, reset for 0 voltage, but a plus reset circuit and burn don't go in, is this why?
Really and reset circuit have nothing to do.
Is not cold start-STC is this single chip features.
Suggest to use its website to write software to cook, you will be prompted to power then click "download", again to electricity.
Its website recommended circuit as the chart data:

Stc51 microcontroller how burned to write programs

Stc51 microcontroller how burned to write programs
http://www.siliconray.com/12au7-6v6-10wx2-push-pull-hifi-tube-amplifier.html
STC single-chip microcomputer and AT the biggest difference between the single-chip series is that the program and write. STC MCU is through a serial port to burn to write programs. The specific steps can consult process:
1, download and install the software STC-ISP;
2, in the STC-ISP software according to the prompt of the face software step1, step2 and so on step by step for choice chip, the choice procedure hex files, choose a serial port and baud rate, times speed selection;
3, click on the download download program;
4, give STC the single electricity.
Note: 3 and 4 order will not be exchanged. STC microcontroller must cold start, not the first after power to download program. In addition, you need to make ISP circuit, microcontroller can't directly connected with pins will be a serial port, should choose MAX232, MAX3232 etc chips for level conversion

Serial communication baud rate automatic identification

Serial communication baud rate automatic identification technology classification: network and the
http://www.siliconray.com/usb-converter-part-pins-uart-module.html
corresponding author: QiaoQu ZhaoGuoHao WangWenJi released in time: the 2008-01-24 for asynchronous serial communication, only in the communication is the same in baud rate, to realize the correct data transmitting and receiving; And some system always want to realize to the various baud rate of compatible. Usually the approach is, ask the other side first issued the regulations characters or data, the system of the character or received after data, calculation each other's baud rate. To adapt to each other's baud rate, such as some wireless transceiver module, GSM communication module, etc. Yet for testing, testing and other fields, and is not required to send system being tested has been a fixed characters or data, then for this kind of communication system and how to realize the wave ?

Based on 51 SCM multimachine parallel communication system

2.2 two-way transfer
Two-way communication mouth can also transmit is receiving data and transmit data, data flow is a two-way street, Ul_L and U2_H is receiving data also transmit data. This way the software programming is more complex, especially two-way transmit data using inquires when way. The inquires between the
http://www.siliconray.com/microcontroller signal more sophisticated. Now is two-way inquires the way as an example, the transfer of data between two single chip microcomputer flow chart as shown in figure 4 shows, U2_H process and U1_L. Among them U1_L U2_H transmit data to the signal and the transfer of one-way query definition, the U2_H P2.3 as U1_L new data transfer to the inquires the signal (the U1_L P2.4), P2.3 = "0" said new data are, P2.3 = "l" said no new data; The Ul_L P2.3 as receiving U2_H data query signal (the U2_H P2.4), P2.3 = "O ?
2.3 the application note
Two single chip microcomputer handshake between if the interrupt, because U2_H to send data U1_L receive external than external data quickly, Ul_L U2_H to transmit data, it is unnecessary to consider U2_H state, and U2_H U1_L to transmit data, due to U2_H receive external data U1_L than to the outside sending data quickly, U2_H must Ul_L inquires the state, that is, if U1_L in receiving U2_H data state, otherwise, U2_H won't be able to Ul_L transmit data.
If as RS_485 communication interface use, just click on the figure 2 a change in the circuit and increase the 75176 chip control of reading and writing, and two single chip with the main communication equipment connected microcontroller as the host, through the P2 mouth the a to coordinate two MCU is receiving data or transmit data.
Note the ?