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Digital Filter Makes Simple SPICE Eliminator - 04/10/97
EDN-Design Ideas.....As an alternative to counter- and
shift-register-based techniques, you can use a digital filter to eliminate
spikes from a signal (Figure 1a]. This scheme, which feeds the
signal into a digital lowpass filter whose output drives a trigger with
hysteresis, can filter short pulses..... [Design Idea by Francois Corthay
Dr Sc, Engineering School Wallis, Switzerland] |
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Digital Game Show Timer - Scroll down to find this circuit.
Using only two CMOS IC packages, this game show buzzer performs well
enough to be on TV! The first contestant to press his button locks out the
other two contestants. The design is completely asynchronous and "fair".
Other logic families will also work and any appropriate power supply is
fine. For simplicity, a single-chime doorbell is used for the aural
indicator…..... |
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Digital Guitar Tuner - (electronic circuit added 4/05)
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Digital Hardware Debug & System Integration: Improving Hardware & Software
Debug of Digital Systems Symposium - Agilent Application
Note.....[App Note] |
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Digital I/O circuit adapts to many interface voltages - 1-Mar-07
Issue of EDN Control newer logic families that can't tolerate
5V..... [Design Idea by Steve Hageman, Windsor, CA; Edited by Brad
Thompson and Fran Granville] |
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Digital LED Ammeter - Measures current up to 10A with selected 100mA, 10mA
and 1mA resolutions. (circuit added 8/06) |
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Digital LED Clock & Timer - This is a combination digital clock timer and
solar panel charge controller used to maintain a deep cycle battery from a solar
panel. The timer output is used to control a 12 volt load for a 32 minute time
interval each day. Start time is set using 9 dip switches and ends 32 minutes later.
The 32 minute duration.....(circuit / schematic design added 6/06) |
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Digital LED Voltmeter - Measures voltages up to 199.9V with 0.1V resolution.
(circuit added 8/06) |
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Digital Lock - A Simple But Very Effective Circuit.....(electronic schematic
added 12/08) |
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Digital Lock-in Milliohmmeter - (schematic / circuit added 6/07)
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Digital Mains Voltage Indicator - ..... |
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Digital Noise Reduction Techniques for Combo Ii - National Semiconductor
Application Note.....[App Note] |
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Digital Nulling of Precision Op Amps - AB-3 Analog Devices Application Notes
(app note added 2/06) |
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Digital PBX Linecard & Terminal - National Semiconductor Application Note
(app note added 2/06) |
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Digital pedometer circuit - (electronic circuit added 4/05) |
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Digital PLL Synthesis - National Semiconductor Application Note 04-Nov-1995
(app note added 4/02) |
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Digital Position Encoder Does Away with ADC - 05/08/97 EDN-Design
Ideas.....The position encoder in Figure 1 is a simple yet powerful circuit that
converts the change in resistance of a potentiometer into a digital value without
using an expensive A/D converter. The working principle is a resistance-to-PWM
converter built around the common 555 timer IC. A change in the potentiometer's.....
[Design Idea by Jose Carlos Cossio, Santander, Spain] |
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Digital pot adjusts LCD's contrast - 02/04/99 Issue of EDN You can use
a digitally controlled potentiometer for many purposes. In this example, you can use
the device to regulate the contrast of a standard (such as two lines by 40 characters]
LCD. You can use the circuit in Figure 1 in a portable test system, in which you need
to change the contrast of the LCD as a function of the viewing angle. You choose the
contrast setup.....Page includes several designs. Scroll to find this one.....
[Design Idea by Jef Collin, CSE Systems, Turnhout, Belgium] |
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Digital Pot Corrects for System Drift - 11/10/94 EDN-Design Ideas.....The
circuit in Fig 1 looks simple but usually comes as a revelation to designers. Under
control of the system's µP, the digital potentiometer, IC1, becomes a variable
set-point reference that can adapt to the long-term drift of the variable measured.
The digital potentiometer replaces schemes involving A/D and D/A converters..... EDN
is migrating links. This link is not verified. Search the "title" + "EDN" for
new link. |
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Digital potentiometer autonulls op amp - 10/22/98 EDN-Design
Ideas.....Op-amp applications that need the highest possible dc accuracy are generally
best served by CMOS chopper-stabilized amplifiers, such as the LTC1050. But
high-speed, low-noise applications may require high-performance rockets, such as the
700-MHz LT1226. So what to do for applications..... [Design Idea by Stephen Woodward,
University Of North Carolina, Chapel Hill, NC] |
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Digital Potentiometer Controls LCD Bias - 03/17/94 EDN-Design
Ideas.....Designers of pen-based computers can easily relegate some controls that were
previously mechanical, such as switches and potentiometers, to on-screen icons. For
example, the circuit in Fig 1 shows one way that digital logic can control the -24V-dc
LCD bias using two general-purpose I/O command lines. The DS-1669 from Dallas
Semiconductor..... [Design Idea by Michael Cortopassi, Dauphin Technology, Lombard,
IL] |
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Digital Potentiometer Controls Phase Shift - 02/15/96 EDN-Design Ideas.....
[Design Idea by Rick Downs, Dallas Semiconductor Dallas, TX |
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Digital potentiometer programs and stabilizes voltage reference - 30-May-02
Issue of EDN The potentiometer portion of a mixed-signal, digitally programmable
potentiometer adds variability to an analog circuit, and its digital controls provide
programmability. You can use a digital potentiometer in two ways in an analog circuit.
You can use it as a two-terminal variable resistance, or rheostat, or as a
three-terminal resistive divider..... [Design Idea by Chuck Wojslaw, Catalyst
Semiconductor, Sunnyvale, CA] |
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Digital potentiometers enable programmable biquadratic filter - 22-Jul-04
Issue of EDN Of the many types of analog filters available to designers, few
allow easy adjustments of the filter parameters. The biquadratic, or biquad, filter is
an exception, however. You can change that filter's corner frequency (ω0], Q, and gain
(H] by adjusting the values of three resistors. For that purpose, the lowpass biquad
circuit of Figure 1 includes three digital potentiometers configure..... [Design Idea
by Deborah Mancuso and Donald Schelle, Maxim Integrated Products, Sunnyvale, CA] |
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Digital Potentiometers: Frequently Asked Questions - Maxim Application Notes
/ 593 / Nov-05.....[App Note] |
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Digital Projector - Intersil Application Block Diagram.....[App Note]
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