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345 results found, displaying items 261 - 280
I2C Simplifies Front-Panel Design
Interfacing a central processor to a user front panel is usually accomplished in one of two ways. The first method involves a power and a serial data link (typically RS-232), which are routed from...
Simple AC-Stop, DC-Pass Circuit Uses Four Op Amps
The circuit presented can be helpful in applications where the desired output is a dc offset voltage of an ac signal. Such an application would be the design of an electronic watt/watthour meter....
Foolproof Pushbutton Debouncer/Latch/Decoder
When the convenience of pushbutton control is desired in a design, the first option considered by the designer might be a keypad scanner-encoder-latch scheme that uses commercially available...
Current-Source Power Supply Is Digitally Programmable
The circuit shown provides a continuous, regulated, and adjustable dc current as required for certain electronic functions, such as the LED backlighting of LCD display panels (...
Make Your Own Bidirectional Current-To-Frequency Converter
The circuit shown (see figure) converts bidirectional currents to frequency. Its useful current range is from 10 mA to 1 A. Also, the output frequency is...
"The Electronic Nag" (Or Time-Awareness Device)
People differ greatly in their ability to perceive and manage time, but all of us must struggle occasionally to schedule daily activities in a fashion that “makes ends meet.” Moreover, those who...
A Spice Model For The Ideal Transformer
The ideal transformer may be described as a two-port device that provides a constant voltage gain and a current gain inversely proportional to the same constant. Such a device is required in...
Better Linearity For Frequency-To-Voltage Converters
In many applications, such as frequency-locked-loop circuits or tachometers, a dc voltage proportional to an input frequency is required. Some special ICs are specifically designed for a highly...
Build A "Cycle-Stealing" Ratio Divider
In many applications, requirements to produce multiple individual frequencies would indicate the usage of a phase-locked-loop (PLL) circuit approach. However, PLLs contain analog circuitry that in...
Special Amplifier Conditions Piezo-Film Signal
Piezoelectric films are capable of electromechanical, mechano-electrical, and pyro-electrical conversions, which correspond to the functions of loudspeakers, microphones, and temperature sensors....
Forward Converters Drive Power MOSFETs At Up To 500 kHz
Simply by combining two simple circuits, high-gate-capacitance MOSFET transistors can be driven at up to 500 kHz with galvanic isolation (Fig. 1). The...
Hot Swap Higher Voltage Supplies
Some applications, such as communications, fault-tolerant computer systems, and networking, require circuit boards to be inserted into a backplane without turning the power off. The bulk supply...
Flash-ROM-Based Multichannel Arbitrary-Waveform Generator
No means for waveform synthesis is more flexible than the arbitrary waveform generator (AWG). In this marriage of digital and analog, large memory arrays that contain a separate datum for each...
Firmware-Adjustable LCD Bias Generator Swings Outside The Rails
Using liquid-crystal-display (LCD) modules over a wide range of temperatures sometimes requires adjustment of the bias voltage to maintain an acceptable contrast level. This adjustment ideally...
IGT Creates A Low-Cost Off-Line "Hiccup" Supply
In equipment requiring a standby mode (e.g., VCRs, TVs), you must still supply power to the microprocessor when everything is asleep in order to receive and interpret the wake-up signal from the...
Miniature Temperature Monitors Drive 3-Speed Fan Controller
Combining a switch-mode dc-dc controller with two low-cost temperature monitor ICs produces a three-speed fan controller (see the figure). This useful...
IGBT powers ultra low-cost offline wall adapter
Universal ac-to-dc wall adapters need to be light and compact to meet international traveler requirements. In that regard, switchedmode power supplies (SMPS), are the natural candidate for these...
Generate IIR coefficients from analog filter prototypes
The C source listing shown is a complete operating program that generates first and second-order IIR digital filter coefficients from analog filter prototypes. The program prompts users for all of the...
Quad op amp performs matching of discrete npn transistors
Many discrete analog circuits require precisely matched transistor pairs. Logarithmic and antilogarithmic functions, differential amplifiers, and multipliers possess inherent matching features generally not obtainable with discrete components. The...
Design a 3-pole, single amplifier, LP active filter with gain
Designs for single-amplifier, twopole, low-pass, active filters with gain are relatively common in the literature, but little information is available for such filters with three poles. Determining the component values for a three-pole filter requires...
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