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High Speed Low Skew RS422 Drivers and Receivers Solve Critical System Timing Problems:
National Semiconductor Application Note 05 Oct1998 / (app note added 7/02) |
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Highside Driver Feeds IGBTs and MOSFET s: 11/23/00 EDN-Design Ideas / (added
5/03) |
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IC Forms Differential Line Driver/Receiver: 05/25/95 EDN-Design Ideas /
(added 3/03) you can use the HFA1212 dual video buffer to implement differential line
drivers and receivers with a minimum of external components |
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Illuminate Holiday Destinations on a World Map: (circuit / schematic design
added 6/06) |
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Illumination Circuitry for Liquid Crystal Displays: AN49 Linear Technology
Current generation portable computers and instruments utilize backlit liquid crystal
displays. The back light requires a highly efficient, high voltage AC source as well
as other supply circuitry. AN49 details these circuits and also includes sections on
efficiency measurements and instrumentation considerations. A separate section
discusses physical and layout considerations for the display. |
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Improve Roll Off of Sallen Key Filter: 09/30/04 EDN Design Ideas /
(added 10/05) The well-documented Sallen-Key active filter is a staple of analog
design. This Design Idea shows a way to obtain better roll-off by adding just a few
common passive components. Figure 1a shows a typical implementation of a three-pole,
lowpass version. In operation, you adjust the ratio of capacitors C1 and C2 to give a
peaked response for the two poles within the feedback loop.... |
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Input Filter Prevents Instrumentation Amp RF Rectification Errors: 11/13/03
EDN Design Ideas / (added 11/05) Instrumentation amplifiers serve in a
variety of applications that need to extract a weak differential signal from large
common-mode noise or interference. However, designers often overlook the potential
problem of RF rectification inside the instrumentation amplifier. The amplifier's
common-mode rejection normally greatly reduces common-mode signals at an
instrumentation amplifier's input. |
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Interface LCD with Ease: 04/27/00 EDN-Design Ideas / (added 1/06)
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Interfacing 16x2 Characterlcd to Parallel Port: (circuit added 7/02) |
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IRADK10 Motor Drive Reference Design Kit: The kit has a Graphical User
Interface (GUI) that enables the user to control motor speed and set the basic control
parameters such as PWM frequency and shut down conditions via the serial link. (added
3/05) |
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Large LCD Panel (14 to 24 inch): Intersil Application Block Diagram
(app note added 6/06) |
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Layout and Grounding Recommendations for Touch Screen Digitizers: AN-577
Analog Devices Application Notes (app note added 6/06) |
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LCD Backlight Inverter Drive IC (FAN7310) / AN-4143: Fairchild Application
Notes / (app note added 6/06) |
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LCD Direct Drive using HPC: National Semiconductor Application Note
(app note added 2/06) |
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LCD Fundamentals using PIC16c92x Microcontrollers: Microchip Application
Note Published 26-Aug-97 (app note added 2/06) |
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LCD Interface Saves µC I/O Pins: 12/12/97 EDN-Design Ideas / (added 3/03) |
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LCD Interface Takes Two Wires: 03/26/98 EDN-Design Ideas / (added 03/03) |
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LCD Monitor Applications / AB-50: Fairchild Application Notes / (app note
added 6/06) |
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LCD Monitor Applications / AB-51: Fairchild Application Notes / (app note
added 6/06) |
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LCD Serial Terminal: has RS-232 serial in/out, up to 20 programmable keys,
Character LCD up to 2x40, 5 auxiliary inputs, 6 auxiliary outputs. (added 7/03) |
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LCD Thermometer: (app note added 6/03) |
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LCD Triplex Drive with COP820cj: National Semiconductor Application Note
(app note added 2/06) |
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LCD-TV Panel: Intersil Application Block Diagram (app note added 6/06) |
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LED Barograph Driver: (electronic schematic added 7/02) Fair Warning: this
site has pop-up ads |
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LED Driver Combines High Speed Precision: 08/21/03 EDN Design Ideas /
(added 1/05) Applications such as turbidity measurement and densitometry require
cleanly pulsed light sources with stable amplitudes. The LED driver in Figure 1
illuminates retinal neurons in a biological experiment that has similar requirements.
For a given LED at a given current, the intensity is stable, so switching a stable
current is a simple and effective way to obtain the needed function.... |
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LED Driver Delivers Constant Luminosity: 06/12/03 EDN Design Ideas /
(added 1/05) The circuit in Figure 1 is similar in principle to that of a
previous Design Idea (Reference 1) but offers improved, more reproducible performance.
The output current is almost constant over an input-voltage range of 1.2 to 1.5V and
is insensitive to variations of transistor gain. Transistors Q1 and Q2 form an astable
flip-flop.... |
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LED Driver Displays Standing Wave Radio: 03/18/99 EDN-Design Ideas / (added
6/03) The circuit in Figure 1 uses an LM3914 LED driver to directly display
standing-wave ratio (SWR) in a low-cost, rugged instrument. The SWR-sensing head is
derived from the ARRL Antenna Handbookin an article that describes the tandem match.
The forward voltage and reflected voltage (VF+VR ) signal drives Pin 6 (RHI ), and the
VF–VR signal drives the normal signal input at Pin 5. You can use this basic
arrangement to display the ratio of two voltages in other applications. The internal
circuit of the LM3914 comprises 10 voltage comparators that compare.... |
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LED Driver Doubles as Fault Monitor: 08/05/04 EDN Design Ideas /
(added 11/05) LEDs find wide use as indicators and as light emitters in devices
such as optocouplers. In some applications, the LED or the emitter may be located
remotely at some distance from the main unit. Typical examples are dashboard-mounted
automotive indicators and industrial optosensors. In critical applications, you may
require some means of monitoring the integrity of the LED. |
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LED Driver Provides Oscillator for Microcontroller: 09/16/04 EDN Design
Ideas / (added 11/05) The major building blocks for a white-LED driver are
an oscillator, a charge pump, and a regulated current source. National Semiconductor
(www.national.com ) produces a device that contains all these building blocks in the
highly integrated LM2791/2 IC. You usually use white-LED drivers in tandem with
cellular baseband controllers or microcontrollers. |
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LED Driver Provides Software Controlled Intensity: 09/30/04 EDN Design Ideas
/ (added 10/05) Recent advances in operating efficiency have expanded the
use of LEDs from one of mere indicators to becoming driving forces in electronic
lighting. Increased reliability and ruggedness (versus other lighting technologies)
gives the LED a bright future indeed. Vendors in recent years have introduced many ICs
for driving LEDs, but the problem of driving serial chains of LEDs has received less
at...... |
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LED Sign: uses two LED arrays to form a 7 X 10 matrix. It produces moving
messages or animations stored in an EPROM. (added 7/03) |
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LED-Based Message Display: (circuit / schematic design added 6/06) |
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Level Shifter Follows Negative Output: 11/23/94 EDN-Design Ideas / (added
3/03) Transistors Q1 and Q2 in Fig 1, develop a feedback signal of the proper positive
polarity for regulator IC1 from the circuit's negative output. You can use this simple
technique to sense any negative-voltage output. The regulator drives a charge pump
comprising L1(Sumida, Arlington Heights, IL, (708) 956-0666), C1, C2, D1, and D2. When
the regulator's switch is on, current builds in inductor L1. At the same time, the
charge on C1 transfers to the output capacitor, C2. During the switch's off time,
energy stored in the inductor charges capacitor C1.... |
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Line Driver Economically Synthesizes Impedance: 01/06/94 EDN-Design Ideas
/ (added 3/03) The line-driver circuit in Fig 1 uses a second op amp to synthesize the
output impedance. The conventional line-driver circuit employs a single op amp having
a resistor whose resistance is equal to the desired impedance in series with the op
amp's output. The principal drawback of the conventional circuit is that the single op
amp must deliver twice the needed output voltage because of the large voltage drop
across the output resistor. The circuit in Fig 1is similar to the famous Howland
current pump but has different resistor values. To calculate the output resistance,
RO, short the input to ground. Then.... |
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Low Cost Lcds Implement Bar Graph Displays: 09/12/97 EDN-Design Ideas /
(added 2/06) |
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Low Power RS-232c Driver and Receiver in CMOS: National Semiconductor
Application Note 05 Oct1998 / (app note added 5/02) |
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LT1399/LT1399HV Triple 300MHz Current Feedback Amplifiers Drive Component Video and
LCD Displays: DN213 Design Notes (Linear Technology) (app note added
6/06) |
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LVDS Display Interface: National Semiconductor Application Note
(app note added 2/06) |
