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• Ten Turn Pot Forms Frequency Readout
  Let’s say you are designing a signal generator for a test fixture. To adjust the frequency you would like to use a ten turn pot with a nice dial mechanism attached as a frequency display. However, a display range of 0 to 9.99 would be impractical since there is no such frequency as 0. But since many pot dials have a display....

Techniques for 92% Efficient LCD Illumination - AN55 Linear Technology This publication details several LCD backlight circuits which feature 92% efficiency. Other benefits include low voltage operation, synchronizing capability, higher output power for color displays, and extended dimming range. Extensive coverage of practical issues includes layout problems, multi-lamp displays,....

Telephone Number Display - The given circuit, when connected in parallel to a telephone, displays the number dialed from the telephone set using the DTMF mode. This circuit can also show the number dialed from the phone of the called party. This is particularly helpful for receiving any number over the phone lines. The DTMF signal—generated by the phone on ....   (added 10/05)

Telephone Number Display EFYLinux - (circuit / schematic design added 6/06)

Telephone Number Display wlwectronicsworld - The given circuit, when connected in parallel to a telephone, dis- plays the number dialled from the telephone set using the DTMF mode. This circuit can also show the number dialled from the phone of the called party...(added 5/02)

Teletext Devices - (circuit added 7/02)

Ten Turn Pot Forms Frequency Readout  - Let’s say you are designing a signal generator for a test fixture. To adjust the frequency you would like to use a ten turn pot with a nice dial mechanism attached as a frequency display. However, a display range of 0 to 9.99 would be impractical since there is no such frequency as 0. But since many pot dials have a display.... ….(designed by David A. Johnson)

Theory and Application of the ML4874 and ML4876 LCD Backlight Controller ICs / AN-42010 - Fairchild Application Notes / (app note added 6/06)

Three-Colour Display using Bicolour LEDs - (electronic Circuit / Schematic added 10/04)

Tiny Regulators Drive White LED Backlights - Linear Technology Design Note 231 (app note added 2/05)

Transistor Considerations for LCD Backlighting: High Efficiency DC-to-AC Conversion - Zetec Semiconductors  Applications Notes A study of the parametric requirements of Bipolar transistors for the self-oscillating resonant "Royer" inverter with respect to LCD backlighting, including circuit behaviour, the voltage ratings of most relevance to ensure optimized device selection, and compact packaging options   (app note added 2/06)

Trip the Light Fantastic with LED Gadget Freaks - Here is a collection of the best LED gadgets that have made themselves home in Gadget Freak…..(circuit added08/08)

Two Wire LCD Interface using PIC16cf84 - (schematic / circuit design added 9/02)

Ultralow-cost, two-digit counter features few components - 8/17/06  EDN Design Ideas  /  (added 10/06)  Two seven-segment displays and one microprocessor count from zero to 99.

Using the AD7877 Touch Screen Controller and the Intel PXA250 Processor Under Windows CE.NET - AN-738 Analog Devices Application Notes  (app note added 6/06)

Using the Noise Reduction Feature on the AD7877 - AN-766 Analog Devices Application Notes  (app note added 6/06)

Wall Clock Governor Driver  - (electronic schematic / circuit added 2/05)

White LED Driver Backlights LCD and Keypad - 11/13/03 EDN Design Ideas  /  (added 1/05)  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 configuration for a phone or a phone/PDA combination is to have a group of three LEDs ....

White LED Driver Provides 64 Step Logarithmic Dimming - 06/10/04 EDN Design Ideas  /  (added 1/05)The circuit in this Design Idea 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.

White LED Driver Touts High Efficiency - 06/12/03 EDN-Design Ideas / (added 7/03) 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 and cellular phones. Like other LEDs, a white LED needs a constant-current source—typically,....