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  1. As a beginner, you may need some basic electronics books (diodes,transistors,current..etc). If you are just starting out with electronics and want to have something to read, then I have some recommendations for you. The Art of Electronics:Paul Horowitz and Winfield Hill Often described as the Bible of Electronics. Its fair to say that if you buy this one, you wont need another for a while! Contents: Foundations voltage and current; passive components; signals; complex analysis made simple. Transistors an easy-to-use transistor model extensive discussion of useful subcircuits, such as followers, switches, current sources, current mirrors, differential amplifiers, push-pull, cascode. Field Effect Transistors JFETs and MOSFETs: types and properties; low-level and power applications; FET vs bipolar transistors; ESD. how to design amplifiers, buffers, current sources, gain controls, and logic switches. everything you wanted to know about analog switching -- feedthrough and crosstalk, bandwidth and speed, charge injection, nonlinearities, capacitance and on-resistance, latchup. Feedback and Operational Amplifiers "golden rules" for simple design, followed by in-depth treatment of real op-amp properties. circuit smorgasbord; design tradeoffs and cautions. easy to understand discussion of single-supply op-amp design and op-amp frequency compensation. special topics such as active rectifiers, logarithmic converters, peak detectors, dielectric absorption. Active Filters and Oscillators PS: The pictures of Oscillators that I have uploaded in the attashment came from this site. You can visit the site and download the datasheet of Oscillators to know more details about it. simplified design of active filters, with tables and graphs. design of constant-Q and constant-BW filters, switched-capacitor filters, zero-offset LPFs, single-control tunable notch. oscillators: relaxation, VCO, RF VCO, quadrature, switched-capacitor, function generator, lookup table, state-variable, Wein bridge, LC, parasitic, quartz crystal, ovenized. Voltage Regulators and Power Circuits discrete and integrated regulators, current sources and current sensing, crowbars, ground meccas. power design: parallel operation of bipolar and MOSFET transistors, SOA, thermal design and heatsinking. voltage references: bandgap/zener: stability and noise; integrated/discrete. all about switching supplies: configurations, design, and examples. flying-capacitor, high-voltage, low-power, and ultra stable power supplies. full analysis of a commercial line-powered switcher. Precision Cicruits and Low-Noise Techniques an easy-to-use section on precision linear design. a section on noise, shielding, and grounding. a unique graphical method for streamlined low-noise amplifier analysis. autonulling amplifiers, instrumentation amplifiers, isolation amplifiers. Digital Electronics combinational and sequential design with standard ICs, and with PLDs. all you wanted to know about timing, logic races, runt pulses, clocking skew, and metastable states. monostable multivibrators and their idiosyncrasies. a collection of digital logic pathology, and what to do about it. Digital Meets Analog an extensive discussion of interfacing between logic families, and between logic and the outside world. a detailed discussion of A/D and D/A conversion techniques. digital noise generation. an easy-to-understand discussion of phase-locked loops, with design examples and applications. optoelectronics: emitters, detectors, couplers, displays, fiber optics. driving buses, capacitive loads, cables, and the outside world. Microcomputers IBM PC and Intel family: assembly language, bus signals, interfacing (with many examples). programmed I/O, interrupts, status registers, DMA. RS-232 cables that really work. serial ports, ASCII, and modems. SCSI, IPI, GPIB, parallel ports. local-area networks. Microprocessors 68000 family: actual design examples and discussion -- how to design them into instruments, and how to make them do what you want. complete general-purpose instrument design, with programming. peripheral LSI chips; serial and parallel ports; D/A and A/D converters. memory: how to choose it, how to use it. Electronic Construction Techniques prototyping methods. printed-circuit and wire-wrap design, both manual and CAD. instrument construction: motherboards, enclosures, controls, wiring, accessibility, cooling. electrical and construction hints. High-Frequency and High-Speed Techniques transistor high-frequency design made simple. modular RF components -- amplifiers, mixers, hybrids, etc. modulation and detection. simplified design of high-speed switching circuits. Low-Power Design extensive discussion of batteries, solar cells, and "signal-current" power sources. micropower references and regulators. low-power analog circuits -- discrete and integrated. low-power digital circuits, microprocessors, and conversion techniques. Measurements and Signal Processing what you can measure and how accurately, and what to do with the data. bandwidth-narrowing methods made clear: signal averaging, multichannel scaling, lock-in amplifiers, and pulse-height analysis. The Art of Electronics is the ultimate reference/explanation. Pretty much anything that you really need to know when designing circuits is in there. But it's not very good at learning book, more as a reference. But if you need to think about all the aspects of a design, they've got you covered. It's a must-have. Paul Scherz's Pratical Electronics for Inventors. I inherited this book from my late cousin. Very concise, almost too concise, but has a ridiculous amount of data/information that is useful for designing practical circuits. However, it's not very good at explaining concepts in an easy-to-understand fashion. That said, this book was easy to use in a pinch at RS to learn enough about transistors to select some for a project in 10 mins after asking for help from the clueless salesperson, and its data tables can be useful. Great as a reference, but might be overwhelming to learn/teach yourself from. The Getting Started With Electronics book from RS, I've found, is probably the worst reference I own. It has cute pictures, but is extremely terse in its explanations. After taking a class on electronics, and re-looking at the book, I find it only useful as a way to jog my memory in remembering formulas, basic circuits and such. He also bucks tradition: all current flow is labeled non-conventionally, which is really confusing when using his reference with others. That confused the heck out me when learning about transistors. That said, it's easy to find and cheap.
  2. UC3842 is a fixed frequency current-mode PWM controller. This IC is specially designed for Off-Line and DC to DC converter applications with minimum external components. In the blog today, we'll have a further discussion about the application of UC3842 in the boost conversion circuit. Boost Conversion Circuit Overview Boost converters can reduce the output current and the capacitance and volume of the output filter capacitor under a certain output power, and are widely used in switching power supplies and electronic ballasts. Commonly used control methods are voltage feedback control and current feedback control. Current feedback control can force the inductor current to track the reference current signal, which has the advantage of fast response. When working in continuous current mode (CCM), the Boost converter needs to introduce multiple feedback methods. When working in discontinuous current mode (DCM), the converter automatically shapes the input current, and has a natural zero-current turn-on characteristic, requires a small inductance value, simple control, and is suitable for low-power applications. At present, there are many researches on the CCM mode of Boost conversion circuit, and many circuit models have been established, and gratifying research results have been obtained; the research on DCM mode is mainly DC/DC circuit, and the research on DCM mode in AC/DC circuit Very little. Based on the requirements of low-power switching power supply with low cost and high cost performance, this paper uses the universal UC3842 chip to design a Boost conversion circuit, analyzes the working characteristics and design points of the DCM mode, and simulates the rationality of the designed circuit verification. There are 2 circuit models of boost converter in DCM mode, named spectively as: Mathematical Model of DCM Working Mode and Working Conditions of DCM Mode. For detailed explanation to these two models>> DCM Circuit Design Based on UC3842 DCM Circuit Design Based on Adder The DCM-type Boost circuit includes two control loops, namely a voltage loop and a current loop. Its function is to eliminate the grid current spikes, so that the input current becomes a sinusoidal shape and is in phase with the input voltage. For a single switching cycle, the current in each switching cycle is required to be proportional to the input voltage. If for some reason the output voltage increases or the output current increases, the pulse width modulator will change the pulse width of the drive signal, that is, the duty cycle D, so that the average voltage or peak current after the chopping will decrease. So as to achieve the purpose of power factor correction. The DCM circuit schematic diagram based on the adder is shown in Figure below. The voltage outer loop uses an adder to replace the multiplier circuit. The feedback voltage on the grid side is used to ensure that the current signal is a sinusoidal signal, and the output feedback voltage is used to ensure that the output voltage is a constant value. The two are synthesized by the adder U2. The output signal is sent to the error amplifier in the UC3842 current loop, compared with a given reference voltage, and the comparison result is sent to the current measurement comparator. The peak current signal L(t) of the inductor in the main circuit is sent to the current measuring comparator at the same time, the comparison result of the two is sent to the R input of the RS latch in the PWM, the clock signal output by the internal oscillating circuit is sent to the S input end of the RS latch in the PWM, which works together to control the opening and closing of the switch tube M1. The follow-up simulation and analysis of DCM mode circuit>> Conclusion This text summarizes the Boost conversion circuit design scheme based on UC3842 chip. By analyzing the circuit of Boost converter in DCM mode, the circuit model of Boost converter in DCM mode is established, and the duty cycle change rule in this mode and the critical conditions for entering CCM mode from DCM mode are studied. Using the universal PWM modulator UC3842 chip, a Boost conversion circuit based on the principle of addition is designed, and the correctness of the conclusions obtained is verified by simulation software. The circuit simulation results show that the designed DCM circuit can meet the requirement of the inductor current to follow the voltage waveform completely and achieve the purpose of improving the power factor. This research provides design ideas for the development of low-cost low-power switching power supplies.
  3. Hi everyone, Many of you may be interested in building electronics DIY kits. Building kits is one of fun and effective ways to learn electronics as well as soldering skill. The most classic and practical kit is LED clock kit for sure. Available clock kits in market provide basic clock features like time and alarm setting. However, if you are looking for a clock kit with more comprehensive functions, more challenging soldering process and larger space for creation, the following clock kit is definitely for you. Let’s take a look at the main functions and features: ⭐ Jumbo 4-digit LED display ⭐ Low power consumption ⭐ 12H/24H time format setting function ⭐ Date setting function, the maximum date is 31 Dec 2099 ⭐ Alarm time setting ⭐ With internal memory for storing alarm settings ⭐ The system keeps running normally for approximately 1 minute when power off ⭐ System reset function ⭐ Selectable power saving mode ⭐ Adjustable LED display brightness ⭐ Low power indication ⭐ With timer output port for controlling peripheral equipment ⭐ Two power input options: (1) external power input (5.5-2.5mm DC Jack): DC 3-5V Adaptor, OR (2) internal power input (Battery Solder Pads): 1.5V Battery Cell x 3 (Battery Not Included) The kit includes detailed instruction manual and assembly manual. Clock housing is NOT included but the main PCB comes with two mounting holes for assisting you to unleash your creativity through making your unique housing, turn it into a desk clock or hang it on the wall. Watch below YouTube videos for better understanding how it works: 【Introductory Video】 (https://youtu.be/OnLkW0r0Nmw) Besides “introduction”, this video shows the assembled clock with innovative handmade cylinder case (it is too boring to make traditional cuboid case), hope it will inspire you to design your own stunning one. 【Operation Demonstration】 (https://youtu.be/D0cj9z7fEIE) It demonstrates every function and setting of the clock. 【Assembly Guides and Tips】 (https://youtu.be/WLdr1t99Q0U) It tells you gentle remainders before building the clock. We provide as kit or fully assembled version. If you are interested, you may directly place order on ETSY shop 👉🏻 https://www.etsy.com/hk-en/listing/697326534/4-digit-led-clock-kit-diy-clock-kit?ref=listings_manager_grid Or you may visit our website for details 👉🏻 http://www.alien-1.com Retail and wholesale are welcomed! Please contact 👉🏻 enquiry@alien-1.com / alien1.enquiry@gmail.com for further information.
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