Top Circuits Page 236
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A portable phone charger for a Siemens mobile phone. Since I don`t use that phone anymore and recent phones can usually be charged with a USB connector I built a new version of the charger. This time with a proper PCB, a USB connector and a higher current....
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This is a 9vdc powered LM13700 dual transconductance op-amp based filter very suitable for battery powered circuits. The design is based on an article by R. A. Penfold for maplin magazine but i have adapted the schematic to have manual filter cut-off and....
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The Stepped Tone Generator is a simple dual oscillator circuit with a single pulse wave output. The first oscillator drives the pitch of the output oscillator which divides the pitch by increasingly smaller amounts as the pitch increases depending on its own....
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A novel method of hydrogen generation by water electrolysis using an ultra-short-pulse power supply Authors: NAOHIRO SHIMIZU, SOUZABURO HOTTA, TAKAYUKI SEKIYA and OSAMU ODA Abstract A novel method of hydrogen generation by water electrolysis using....
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Find Permanent Magnet DC Generator, Magnetic Motor Generator and more at Magneticgenerator.info. Get the best of Free Energy Magnet Motor or Cash Advance, browse our section on Debt Consolidation or learn about Insurance. Magneticgenerator.info is the site....
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Calibrate the measurement circuit by forcing a known conductor current and measuring the resulting voltage output. If sensor to conductor displacement changes, recalibrate This sensor circuit can measure DC and AC currents to the bandwidth of the op-amp.....
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This resource contains step to step information to make AVR microcontroller programmer with suitable circuit diagram. This programmer able to program 8051, AT89XX, AT90XXXX, 8031 family microcontrollers....
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The counter must be programmed as part of a batch-counting operation to sort parts automatically for quality control. The counter is installed to divert 1 part out of every 10 for quality control or inspection process. The circuit operates as follows...
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This is the next part in our learning Arduino series, and this time we ll be learning about and using Arrays to make a little Christmas tree ornament with various flashing sequences. This would be an ideal project to keep the kids occupied if you`d like to....
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If you want to improve your Arduino programming, creating a traffic light controller is great practice....
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How to Make a Hydrogen Generator 555 Timer Circuit PWM. This Pulse Width Modulation (PWM) Circuit could Produce Hydrogen on Demand....
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The description of this circuit is rather simple. The RTS line of the serial port gives power to the voltage regulator which fixes it to 5 stable volts. A diode is there to protect the serial port from inverse current. The capacitor helps to keep a stable....
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In order to create the circuitry below, you need a computer software that will control your parallel port. It will cost you about 30 US$. For example, a transistor (model number 2N2222) costs ~50, a DPDT relay, ~1. 75$ (this is maybe the most expensive....
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The challenge of this project is to create a model of a capacitive touch screen, including physical modeling of a user`s finger, the touch screen materials, and the touch-detection circuitry. A capacitive touch screen works by measuring the change in....
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The L298N driver module contains the ST` L298N chip, ususlly used to drive two 3-30V DC motor, there is a 5V output interface, power for 5V single-chip circuitry, support 3. 3VMCU control. With it, you can control the DC motor easily. You can get the diagram....
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Extending BT telephone sockets can result in hum appearing on the line or, if two telephone lines are taken through the same cable, cross talk from one line to another. This is simply the lack of using twisted pairs correctly, here we show you how it should....
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This could be achieved by monitoring separate points either through the same recorder, or worse still, two separate recorders. In both cases the results need to be artificially summed to get the total current draw. Two problems exist with this, the first....
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Batteries are one of the energy sources available onboard vessels which are used in case of blackout and emergency situations on board a ship. These batteries are used for low voltage dc system like bridge navigational instruments and thus need to be kept....
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Software such as that available on PGM-Fi. org and from Hondata make use of the Honda ECU`s oxygen sensor input to allow real time display and data logging of wideband oxygen sensors. This involves feeding the analogue output of the wideband sensor`s....
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Here is the schematic circuit board. Each switch puts out -2V when it`s on and 0V when it`s off. The four 4067 chips multiples the 64 switch signals into 4 signals that go back to the main PIC board...
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Manufacturer of Thermoelectric Materials, Custom Thermoelectric Coolers and Value-Added Thermal Assemblies....
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I was just looking through some old info I gathered on the Silver Jubilees as research before I bought my 2554. There was one for sale in some....
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As some of you know, the Traynor YBA-1 is a very close derivative of the classic Bassman/JTM-45 circuit. I recently picked up a spectacularly clean `67 copy that was all original with the exception of a rather "crappy" fully reversible master volume mod and....
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In this experiment, an oscillator is constructed using an operational amplifier and some other passive elements. This configuration for the oscillator is called Wien Bridge. The frequency of the oscillator is determined by R4, R5, C1, and C2 elements. In....
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Here`s a few details on the Infrared Remote Control Extender unit I designed and built to control my NAD T752 A/V receiver. The NAD T752 has an IR input socket on the back of it for system installs where the unit has to be inside a cabinet or at least out of....
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The infra-red receiver requires the infra-red light to be modulated at 38 kHz, this is quivalent to a period of 26 µs. The specifications on the receiver suggested using a 50% duty cycle. We found however that this did not work the way we intended. To....
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In case of Japan, the electricity to be using in the home is 50 Hz or 60 Hz. In case of 50 Hz, the 1-cycle sine wave occurs the 50 times for the 1 second. 60 Hz are the 60 times. There is a way of making make the Lissajous as the way of understanding that....
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When adding an alternating current signal to the capacitor, the wave position (the phase) of the charging current of the capacitor and the voltage of the capacitor shifts by 90 degrees. When adding an alternating current signal to the coil, it changes....
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File exchange, MATLAB Answers, newsgroup access, Links, and Blogs for the MATLAB & Simulink user community....
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Simulation of Colpitts Oscillator circuit using npn transistor and other components available in SimElectronics is shown. The feedback ratio is determined by the relative values of the Capacitors C1 and C2. Frequency of oscillation is given by f =....
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This application note describes an application of the MAX2361 quadrature transmitter IC in the Korean PCS band (Tx = 1750-1780MHz)....
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This application note describes the design of a PC-based, 14-bit data acquisition system. It takes a system approach, includes all the necessary building blocks: analog, digital, hardware, and software. It discusses each step, testing systems separately....
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Tracks the history of voltage-controlled oscillators (VCOs) since approximately 1910. Provides examples of VCO integration in RF ICs....
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Article shows how to add an NPN transistor and few external components to a shunt regulator to create inexpensive LDO. Tiny LDO uses no output capacitors and provides up to 2A output current....
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This application note explains how the transfer function of most op amp circuits can be derived by a simple process of nodal analysis....
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This application note covers the design of a UHF ingress filter for a Satellite DBS tuner. The filter provides 20dB of stopband attenuation from 54-650MHz with 0.7dB in-band insertion loss....
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This paper is a tutorial discussion of IF VCO design considerations. A Colpitts topology is analyzed and used to explore performance impacts....
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This application note details the design of a 50-watt, isolated, forward converter, using the MAX8540 synchronizable, high-frequency, current-mode PWM controller....
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By removing harmonics from a square wave, this circuit generates an accurate and adjustable sine-wave output....
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The term VCXO stands for Voltage Control Crystal Oscillator. The frequency of such an oscillator can be adjusted by a small amount through changing the control voltage. VCXO CLK generators have been used in various applications, such as digital T....
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A PIN photodiode, four low-noise op amps and a comparator are used to detect individual photons of gamma radiation. The schematic, design considerations and component selection are discussed....
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Schematic and operation of a microcontroller-based driver circuit for large 1-Wire networks; includes software flowcharts and scope traces....
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This technical note is focused on how to determine the system specification of a CDMA receiver in order to establish a practical specification for a low noise amplifier and down converter....
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This article reviews basic servo systems and development of the fault-tolerant feedback systems for servo systems. Controller receiver circuit design, proper PC-board receiver circuit layout, and the encoder`s signal cable and termination are discussed.....
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This application note presents alternate RF matching networks for the MAX2653 SiGe LNA, tuned for the GPS band (1575MHz center frequency). Performance metrics (supply current, forward gain, NF, IIP3, reverse isolation and input/output return loss) for both....
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Compact thermal control solution for DWDM (Dense Wavelength Division Multiplexing) laser modules can be made using a MAX8520/21 and a single op amp....
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Strain-gauge sensors transduce (convert) strain into an electrical signal for use in pressure sensors, weight measurements, force and torque measurements, and materials analysis. A strain gauge is simply a resistor, whose value varies with strain in....
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This article describes three options for interfacing the DS1859 to the MAX3735. Itincludes a new technique using an opamp that gives a linear transfer function that can be adjusted for any arbitrary current range. All of these techniques can be appl....
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Complete GPS solution using MAXIM CMOS RF front-end receiver MAX2742 and SONY GPS baseband CXD2932 is presented....
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A circuit is described that transmits temperature data over an IR link. This allows isolation of the temperature sensor....
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Application circuit using 3 stereo digital pots to control volume, balance and fader in 4 speaker configuration and push button interface....
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The IEEE 802.3af standard governs how the power-sourcing-equipment and power device interact with each other in a power-over-ethernet system....
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Even as display devices move toward digital video, they retain the legacy of an RF-modulated analog TV output. That output is specified in the US by the National Television Standards Committee (NTSC), and utilized in security applications and in the Digital....
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This application note provides valuable PC board layout, bypassing and decoupling guidelines for customers who are implementing high-speed data converters in their designs....
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A short note describing how to replace crystal and ceramic resonator clock circuits with silicon oscillators and highlighting some of the technical advantages offered by these devices in microcontroller clock applications....
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This application note includes a brief overview of power amplifier theory and it includes simulation results that provide insight into the operation of the power amplifier on all of MAXIM s LFRF transmitters and transceivers....
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Flyback LED drivers are versatile because they can be used for applications that have input voltages above or below the required output voltages. They lend themselves to a simple circuit configuration that keeps the LED current constant without using....
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This article examines key parameters in choosing a low noise amplifier for low frequency analog applications such as buffering data converters, amplifying strain-gauge signals, and pre-amplifying microphone outputs....
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Describes how to layout switch-mode DC-DC converter printed circuit boards (PCBs) to minimize switching noise and EMI....
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Detailed discussion of how to add current limit or foldback current limit to the linear regulator controllers of the MAX1864. Can be used with other discrete regulator designs such as in MAX1865, MAX1964, MAX1965, MAX8513, and MAX8514. Shows tested c....
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LVDS receiver needs a failsafe function to avoid uncertain output state when it has an improper connection. In this appnote, we examine the circuits and characteristics of three popular failsafe functions: external-biasing, in-path, and parallel....
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This application note explains the operation of the data slicers found in the Maxim line of UHF receivers like the MAX1470, MAX1473, and MAX1471 and transceivers like the MAX7030 and MAX7032....
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Lithium-based (Li+) batteries are becoming common in portable equipment. They have desirable characteristics, but they are often in short supply. Lead times can be long unless you have a preferred-customer status with the battery manufacturer. A backup....
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Any step-down DC-DC converter can be used as an inverter with no changes to the operating schematic. The only differences between the normal step-down application and inverting operation are the labels of the connection points. The step-down VOUT is....
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This application note analyzes the details of a Wien-bridge oscillator, shows how a JFET maintains oscillation, and demonstrates adding a digital potentiometer (digipot), rather than a variable resistor, to improve stability and flexibility....
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This characterization circuit, plus a PC and some software, accurately measures the full discharge cycle for a rechargeable AA cell. Cell capacity and output resistance can easily be determined from the curve resulting from these measurements. Rechargeable....
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This application note provides insight into how synchronize multiple multiplext high-speed DACs in transmitter applications....
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MAX5953A provides a simple, inexpensive, complete, non-isolated power IC solution for Powered Device (PD) in a Power-over-Ethernet (PoE) system....
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As high-performance microprocessors demand more power in auto multimedia and telematics, (aka infotainment products), so do some of the well-known problems like noise susceptibility, EMI and loop compensation to name a few. Average current-mode control....
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This paper outlines a clear printed circuit board layout for implementation of the MAX8632 Integrated DDR Power Supply. This chip functions as an integrated DDR Power-Supply Solution that utilizes a synchronous-buck controller to generate VDDQ main rail, a 3....
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A switch-mode power supply provides ±15V or ±12V @ 0.5A output from a 4.5V to 12V input Wide input voltage range allows flexibility to be powered from a regulated DC voltage....
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Ultra-low EMI, Mono and Stereo, Class D audio power amplifiers provide Class AB performance with Class D efficiency. Maxim`s spread spectrum modulation (SSM) along with 3rd generation EMI reduction techniques reduce EMI radiation by lowering the high....
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Cost, size, resistance, and current capability drive the choice of inductor for most stepdown dc-dc switching converters....
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Application note explains how to implement a 2.1 (satellite/subwoofer) audio power-amplifier system with 2 x 2W and 1 x 7W of output power from a single 5V power supply....
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This application notes describes how the MAX4929E takes care of switching all low frequency signals (LoF) needed for a 2:1 HDMI/DVI switch while adding high level ESD protection to all outside lines, and how MAX4929E mates with an EDID EPROM, accepting 5V....
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This application note describes how to transmit I ²S audio data streams between two audio components across a single, shielded twisted-pair (STP) wire using the MAX9205 10-bit LVDS serializer and the MAX9206 10-bit LVDS deserializer. Low-voltage differential....
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In some video applications, the signal sources deliver RGB signals and a composite sync signal. The RGB signals contain no video sync. At the receiver side, some low-cost video decoders do not have a stand-alone composite sync input; they only accept the....
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By adding discrete inductors in series with the device, we can œtune out some of the capacitance, and improve the eye opening. If we add enough inductance to peak the 3rd harmonic of 240 MHz, with the capacitance of the device and any added board....
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This module uses the highly integrated MAX2830 RF transceiver. It is a complete RF front-end solution that meets the WLAN IEEESM 802.11b/g standard....
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It is possible to implement a PoE Plus-required power level of 30 W, with the aid of an external MOSFET and a controller designed for the older standard....
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The DS2715 is a complete NiMH (Nickel Metal Hydride) smart-charger solution with load detection well suited to low-cost applications....
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This application note discussed the use of SEPIC power modules to provide the power needed to drive high-brighness LED arrays. The arrays are used as display backlights and require a wide dimming range. The SEPIC approach provides an efficient and flexible....
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Article for an LED driver design for automotive rear lights. Shows how dimming is best achieved with PWM and an LED driver IC that eliminates the need for external PWM signal....
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This reference design demonstrates the MAX98400 Class D audio amplifier in a stereo audio docking station application. The demo box is a powered speaker dock that drives a speaker system consisting of 2in satellite speakers and a 5in subwoofer....
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This application note outlines the implementation of a single-supply, triangular wave oscillator using the MAX9000 and some passive components. The application circuit uses an op amp, comparator, and a voltage reference as active building blocks. The MAX9000....
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Different techniques show how additional PWM (pulse-width modulation) intensity control can be applied to LED (light-emitting diode) drivers....
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A tiny comparator (MAX9060/MAX9061 or MAX9028) protects the LED driver in a backlit display when you disconnect the LEDs, by generating a shutdown signal that removes the LED voltage....
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Add a simple, low-cost, jack-sensing circuit (JACKSENSE) to a DirectDrive automotive headphone amp and detect when a headphone is inserted into the audio jack....
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Article explains how to layout a standard MAX16922 automotive PMIC (power-management IC) to maximize performance and minimize emissions....
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Power-supply sequencing tutorial uses the MAX16046 system-management IC. Configuration software simplifies the configuration of the tolerances and the sequence order....
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A step-up converter followed by an LDO regulator offers better battery life than a classic SEPIC design when operating from one lithium-ion cell....
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Charge NiCd or NiMH batteries with solar cells. This circuit extracts the maximum power from a solar array to charge a battery stack. It employs the MAX856 boost converter and MAX982 dual comparator with reference. As a power source, the sun offers some....
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Reference design for an automotive antenna features an AM/FM low-noise amplifier (LNA) for active antenna modules. Article details the capabilities, features, and ease of design with an AM/FM active antenna LNA....