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345 results found, displaying items 121 - 140
Code Improves Display Stability For DC Signals With Large Ripple
Sometimes, dc signals from physical parameters (temperature, current, voltage, etc.) may show a little variation in time caused by electromagnetic interference, or even by its own nature. For example, in dc power plants, even high-frequency...
Stored Energy In Relay Coil Boosts Op-Amp Supply Voltage
The circuit shown in the figure uses stored energy in the multiplexer relay coil to boost the power-supply voltage from 3.3 to 5.1 V. This extra voltage enhances the amplifier's ability to produce a larger output voltage suitable for interfacing...
Drive Pyrotechnic Igniters From A Microprocessor Port
Certain irreversible operations (like releasing a parachute, cutting a rope, or starting a solid combustible missile engine) may be performed by pyrotechnic igniters. These devices generally consist of an electrically controlled igniter, some...
Simple Circuit Maintains Water Level Between Two Preset Limits
Here's an extremely simple water-level maintainer that keeps the water level between two predefined levels (see the figure). Due to the high input impedance of the LM311 IC (U1), practically no...
Single-Supply Circuit Handles Bipolar Sensor Signals
I recently had the task of designing an analog front-end circuit for a microcontroller application. A full-bridge sensor in a standard configuration produced the input signal. An instrumentation amplifier then amplified the low-level signal and...
Op Amp Idles To Save Power In Smoke Detectors, Other Sensors
With its power-saving mode, the LMV422 operational amplifier lets designers reduce power consumption while maintaining an active circuit. Thus, there's faster turn-on times in smoke detectors and other sensor interface applications where...
Smart Dual-Channel DC Motor Controller Drives Mobile Robots
It's now possible to directly drive up to 60 continuous amps on each channel of a dual-channel dc motor controller at up to 40 V. The microcomputer-based AX3500 provides optical-encoder input for automatic guided vehicles, underwater remotely...
Two- And Four-Channel Audio ADCs Target Professional Production Gear
Professional and broadcast audio boards, which typically process many audio channels, are the target application for two high-performance, 24-bit audio analog-to-digital converters (ADCs). The PCM4202 and PCM4204 offer a 118-dB dynamic range,...
Pin-Strapping Selects Internal Resistors To Set Gain
While traditional amplifiers use external resistors to set gain, a new amplifier family integrates on-board thin-film precision resistors that can be selected by pin-strapping. Users can configure the LT1991 and LT1995 as difference, summing,...
Temperature-Sensor IC Monitors Seven Channels Simultaneously
A small-footprint (8.5 by 6 mm), seven-channel temperature-sensor IC reads thermal diodes or thermistors to 1°C accuracy. The MAX6697 measures its own temperature as well as the temperature of up to six external locations, such as CPUs, GPUs,...
Single Op-Amp Peak Detector Features Signal Accumulation
Figure 1 demonstrates a one-way switched-capacitor gain stage circuit, performing a voltage gain of AO = C1/C2 only during the decreasing trail of the input signal Vi (with VJ...
Resistor And Transistor Synchronize Flashing LEDs
The ubiquitous LED continues to expand frontiers and applications with a plethora of sizes, colors, and output lumens. Flashing LEDs that incorporate internal electronics for oscillation offer embedded applications the advantage of size....
Parallel LED Driver Hits 93% Peak Efficiency
The FAN5607 constant-current parallel LED driver from Fairchild Semiconductor provides analog and/or pulse-width-modulation brightness control for LCD backlighting in ultra-portable applications. It uses a three-mode charge pump and achieves 93%...
Quad Delta-Sigma Modulator Directly Connects To Transducers
For motor control and industrial process control, Texas Instruments' ADS1204 quad delta-sigma modulator enables direct connection to transducers or low-level signals.
Just For You
Welcome to the first of many "Analog and Power Ideas for Design." The feature will return next month. If the reader response is positive, the plan is to publish this section 13 times in 2005. A&P IFD is the launch of something new and...
Automatic Switch Handles RS-232 Or RS-485 Serial Data
The need arose for a programmable control system that handles 8-bit data to have both RS-232 and RS-485 modes. This requirement was satisfied with a serial communication controller-transceiver, an octal buffer, and a two-line port (Rx and Tx for...
Sense Small Capacitance Changes Over A Wide Range
With this simple circuit connected to a serial port, small capacitance deviations on the order of 0.01 pF can be easily sensed over a wide range of several hundred picofarads (see the figure)....
Gimmick Capacitor Stabilizes High-Frequency Op Amps
The stability of high-unity-gain-bandwidth op amps is susceptible to stray capacitances. Instability doesn't first show up as oscillation, but rather pronounced overshoot and ringing. Op amps such as the TLV278X, TLC08X, and TLC07X have...
PIR Light Controller Relies On A Missing-Pulse Detector
Figure 1 shows a way to control a light (or other 120-V ac appliance) with a passive-infrared (PIR) alarm sensor. The original concept was to turn a closet or shop light on whenever someone went into...
Solid-State Relay Features Load Indicator
Several years ago, I designed a remote energy-control system that split a building into sections and wired the overhead space heaters into "zones." As space was an issue and OAC5s (optically isolated output modules) were way too big, each...
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