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Calculator Program Evaluates Elliptic Filters:  03/31/05 EDN Design Ideas  / (added 11/05)  Find  poles and zeroes of elliptic-filter designs using Darlington’s algorithm implemented on a calculator.

Caller ID Display Service:  Caller ID decoder based on 68HC11, text in French / (added 6/03)

Caller ID:  (circuit / schematic added 2/03)

Circuit Adapts Differential Input to Drive Coax:  05/08/97 EDN-Design Ideas / (added 3/03)   -Uses an HFA1100 or HFA1105 to convert a balanced input signal to a single-ended output signal, uses positive feedback to characteristic-impedance matching while increasing the available output swing, as compared with using a simple series termination resistor

Circuit Controls Brightness of Multiple Displays:  05/30/02  EDN Design Ideas / (schematic / circuit added 11/03)    I recently needed to control nine seven-segment displays for a microcontroller's serial port. The complication I faced was the need to provide a continuous brightness adjustment for all the digits—from completely dark to fully bright. I couldn't easily use the obvious solution of a string of 74HC595 serial-to-parallel converters driving the segments through series resistors, because I wou....

Circuit Delivers Dimming Control for White LED Driver:  10/28/04 EDN Design Ideas  / (added 1/05)  The demand for power in color cell-phone handsets is constantly increasing. New applications steadily emerge, making it imperative to reduce power consumption in the design. Examination of usage data shows that more than 50% of the power consumed is in providing backlighting for the color screen. People use the phones for playing games and MP-3s and a multitude of other heavy-duty, multimedia f...

Circuit Forms Simple Low Cost 1 Kv Driver:  05/13/04 EDN Design Ideas  /  (added 1/05)  High-voltage drivers have recently received much attention, because they play an important role in driving piezoelectric and electro-optical components, for example. Figure 1 shows a simple, low-cost, 1-kV driver. The circuit uses offline, current-mode-control techniques and a flyback switching-power-supply design....

Circuit Makes Universal VCSEL Driver:  07/10/03 EDN Design Ideas  /  (added 1/05)  VCSELs (vertical-cavity surface-emitting lasers) are commercially available infrared semiconductor lasers with λ≅850 nm. Short-cavity-length, high-quality Bragg mirrors impart properties to VCSELs that differ from those that earlier Fabrey-Perot lasers impart. The emission characteristics—optical power, Pλ, versus diode current......

Circuit Provides Effective LCD Drive:  09/28/00 EDN Design Ideas /  (added 2/06) 

Circuit Tests VCOM Drivers:  11/11/04 EDN Design Ideas  / (added 5/05)  Flat-panel LCD monitors offer excellent image quality and more compact form factor than CRTs—hence, their steadily increasing popularity. Unfortunately, the complexity of their manufacturing process makes LCD monitors considerably more expensive than CRTs. The amplifier that drives VCOM, the voltage on the backplane of the LCD panel, must be able to drive large capacitive loads, deliver h...

Circuit Thermally Compensates LCD Contrast Bias:  03/16/95 EDN-Design Ideas / (added 03/03)  

Circuit Tricks Increase LCD Contrast:  04/24/97 EDN-Design Ideas  / (added 2/06)   

Code Provides Adjustable Differential Drive for Robots:  10/16/03 EDN Design Ideas  /  (added 1/05)  Intelligently modifying the motor-drive commands to a robot can give you control finesse during competitions. Moving a joystick hard right, for example, might have different effects, depending on the robot's speed and direction. Software running on an inexpensive microcontroller (in this case, an NEC (www....

Component Video Filtering Using the ML6420/ML6421 / AN-42035:  Fairchild Application Notes / (app note added 6/06)

Configuring the AD7877:  AN-753 Analog Devices Application Notes  (app note added 6/06)

Connecting AT90S2313 with LCD Display 2x16 Char and 4x4 Keypad:  (electronic circuit added 4/05)