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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. |
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Call Sign Annunciator - (electronic circuit added 4/05) |
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Caller ID Circuits - information and circuits for different systems used USA and
Finland (added 5/02) |
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Caller ID Decoder - (circuit / schematic added 2/03) |
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Caller ID Display Service - Caller ID decoder based on 68HC11, text in French /
(added 6/03) |
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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 |
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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.... |
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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.... |
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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...... |
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Circuit Thermally Compensates LCD Contrast Bias - 03/16/95 EDN-Design Ideas /
(added 03/03/03) |
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Circuit Tricks Increase LCD Contrast - 04/24/97 EDN-Design Ideas / (added
2/06) |
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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.... |
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Component Video Filtering Using the ML6420/ML6421 / AN-42035 - Fairchild
Application Notes / (app note added 6/06) |
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Configuring the AD7877 - AN-753 Analog Devices Application Notes (app note
added 6/06) |
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Connect a 2x16 characters LCD display to a 4x4 keypad - Connect some 2x16
characters LCD display and 4x4 keypad with AVR microcontroller (electronic
design added 03/04/05) |
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Connecting AT90S2313 with LCD Display 2x16 Char and 4x4 Keypad - (electronic
circuit added 4/05) |
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Constant Current Constant Voltage Converter Drives White LEDs - 09/02/04 EDN
Design Ideas / (added 11/05) LEDs usually take their drive from a constant
dc-current source to maintain constant luminescence. Most dc/dc converters, however,
deliver a constant voltage by comparing a feedback voltage to an internal reference
via an internal error amplifier.... |
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Controller Supports Differential Monitor Display - 06/24/99 EDN-Design Ideas
(added 6/06) |
