Use An LED Matrix Horizontally  -  02/16/12  EDN Design Idea   Using one 5×7 LED matrix horizontally instead of vertically allows the display of two characters instead of one. LEDs provide a convenient way to electronically display information. Although the seven-segment LED display, arranged in the form of the digit 8, is common, it does not allow the display of some alphanumeric characters. A 5×7 LED matrix allows the display of all ASCII characters, as well as graphics shapes. LEDs provide a convenient way to electronically display information. Although the seven-segment LED display, arranged in the form of the digit 8, is common, it does not allow the display of some alphanumeric characters. A 5×7 LED matrix allows the display of all ASCII characters, as well as graphics shapes. The circuit in this Design Idea shows an unconventional way to use a 5×7 LED matrix. . .  [by Benabadji Noureddine]

Using the AD7877 Touch Screen Controller & the Intel PXA250 Processor Under Windows CE.NET  -  AN-738 Analog Devices App Note - . . .   

Using the Noise Reduction Feature on the AD7877  -  AN-766 Analog Devices App Note - . . .   

Versatile LED Display  -  This circuit uses an erasable programmable read only memory (EPROM) to display various light patterns on LEDs. Since bicolour LEDs (comprising green and red LEDs) have been used, display is possible in three colours (green, red and amber). . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]

VFD (Vacuum Fluorescent Display) and Filament Power Supply  -  The LT3581 is a PWM DC/DC converter with built-in fault protection features to aid in protecting against output shorts, input/output overvoltages, and overtemperature conditions. The part consists of a 42V master switch, and a 42V slave switch that can be tied together for a total current limit of 3.3A. . . .  [Linear Technology App Note - , Jan 16th 2012]

VFD (Vacuum Fluorescent Display) Flyback Power Supply  -  The LT3758 is a wide input range, current mode, DC/DC controller which is capable of generating either positive or negative output voltages. It can be configured as either a boost, flyback, [Linear Technology, SepIC or inverting converter. The LT3758 drives a low side external N-channel power MOSFET from an internal regulated 7. 2V supply. The. . .  [Linear Technology App Note - , Jan 16th 2012]

Visual metronome  -  Schematic only, no circuit description. . .  [Designer's name not given]

Wall Clock Governor Driver  -  These were common before the advent of quartz controlled stepping motor clocks. Here is a reverse engineered diagram of this very typical circuit. . . .  [Reverse engineered schematic by Stepan Novotill]

Waveform Monitor with LCD  -  The result was a project that includes a waveform capture circuit, a graphic LCD (Liquid Crystal Display) and a control panel with LED indicators. The details of the Graphic LCD display unit, composed of the LCD module, a serial interface, and bias supply were published earlier on this site, . . .  [From Dick Cappels' project pages]

White LED driver backlights LCD and keypad  -  11/13/03  EDN Design Idea   Designers widely use white LEDs to backlight color LCDs and keypads in handheld devices, such as cell phones, MP3 players, GPS navigators, and PDAs. Their spectrum and brightness represent near-ideal light sources. One possible con. . .  [by Fabien Franc, Catalyst Semiconductor, Sunnyvale, CA]

White LED driver provides 64 step logarithmic dimming  -  10-Jun-04 EDN Design Idea   The circuit of Figure 1 is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels. The circuit drives as many as four white LEDs from a 3.3V source and adjusts the total LED cur. . .  [by William Hadden, Maxim Integrated Products, Sunnyvale, CA]

White Light LED Driver With Gradual Dimming (Rev. A)  -  Texas Instruments provides a broad portfolio of high-performance products for your LED design needs. From RF and power management (including AC/DC, Power Factor Correction, DC/DC and linear power conversion) to DSPs and ultra-low-power MCUs, TI has products to differentiate your design. And, TI's local support and applications expertise can help you get to market faster. . . .  [Texas Instruments App Notes, 10-Jan-07]

White-LED Driver Touts High Efficiency  -  06/12/03  EDN Design Idea   White LEDs, the most recent addition to the LCD backlight, find common use in providing backlight for color LCDs. Thanks to their size and white-light output, they appear in small, portable devices with color displays, such as PDAs. . .  [by Dimitry Goder, Sipex Corp, San Jose, CA]

Wide Band Fuel Mixture Display  -  This document is an introduction to the Wideband Fuel Mixture Display (FMD). . . .   

xTimer V1.0  -  Easy build 4-channel timer, suitable for energy saving, simple hardware and nice firmware with c coding. Automatic power down mode, simple settings, optional buzzer for sound alarm. . . .  [Wichit Sirichote, designer]

YPBPR to RGB Converter  -  In this realization of a component video (YPBPR) to RGB adapter, Amplifier count is minimized by performing passive arithmetic at the outputs, but this requires higher gains, thus a higher supply potential is needed for this (for at least the positive rail). One small drawback to this otherwise compact solution is that the. . .  [Linear Technology App Note - , Mar 25th 2010]

YPBPR to RGB Video Converter  -  This circuit shows LT6552 Amplifiers connected to convert component video (YPBPR) to RGB. This circuit maps the sync on Y to all three outputs, so if a [Linear Technology, Separate sync connection is needed by the destination device (e. g. studio monitor) , any of the R, G, or B channels may be simply looped-through the sync input (i. e. set ZIN. . .  [Linear Technology App Note - , Mar 25th 2010]