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Potentiometer Circuits, Page 2
Potentiometers:  #'s - A      B - D      E - L      M - Q       R - Z
Last Updated on: Tuesday, April 01, 2014 04:29 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
Calibrated trim tool tweaks multiturn pots -  01/07/99 Issue of EDN  Many analog circuits contain multiturn trimming potentiometers whose settings you may need to change during maintenance or calibration. Also, some instruments have panel-mounted potentiometers that may need periodic adjustments.....Page includes several designs.  Scroll to find this one.... [Design Idea by Sanjay Chendvankar, Tata Institute, Mumbai, India]
Circuit forms industrial-grade digital potentiometer -  20-Sep-01 Issue of EDN  Both ac and dc motors in modern industrial systems often receive their control from PLCs (programmable-logic controllers] in a control room.... [Design Idea by Phill Leyva, Maxim Integrated Products, Sunnyvale, CA]
CMOS IC Makes Low Cost Digital Potentiometer -  01/18/96 EDN-Design Ideas....A growing trend in the design of electronic equipment is to replace analog knobs used to increase or reduce a continuous signal (such as volume or brightness]with "up" and "down" keys. However, replacing a low-cost.... EDN is migrating links. This link is not verified.  Search the "title" EDN for new link.

Communicating with Daisy Chained MCP42XXX Digital Potentiometers -  Microchip Application Note Published 2-Apr-01  (app note added 2/06)

Comparing Digital Potentiometers to Mechanical Potentiometers -  Microchip Application Note Published 20-Nov-00  (app note added 2/06)
Convert voltage to potentiometer-wiper setting -  5-Sep-02 Issue of EDN  The circuit in Figure 1converts an analog input voltage, VIN, to a proportional wiper setting of a DPP (digitally programmable potentiometer]. The potentiometer's wiper setting, which varies from position 0 through 31, corresponds to the input voltage, which varies from 0 to 1V dc. The CAT5114, IC5, is a 32-tap potentiometer with an increment/decrement interface.... [Design Idea by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA, and Chris Wojslaw, Conexant Systems, Newport Beach, CA]
DC Power Wire also Carries Clock or Data -  03/13/98 EDN-Design Ideas....High-side current-sense amplifier, IC1, offers a simple method of combining low-speed clocks or other signals with dc power in cables between subsystems.... [Design Idea by Mike Hardwick, Decade Engineering, Turner, OR]
Difference amplifier uses digital potentiometers -  30-May-02 Issue of EDN  You sometimes need to measure a small signal in the presence of a large common-mode signal. Traditional instrumentation amplifiers that use two or three op amps in their internal structure find common use in these applications. The circuit in Figure 1 presents an alternative approach that is useful when low cost and low drift are important, but when you don't need high precision.... [Design Idea by Reza Moghimi, Analog Devices, San Jose, CA]
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]
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.
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]
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]
Digital Potentiometer Controls Phase Shift -  02/15/96 EDN-Design Ideas.... [Design Idea by Rick Downs, Dallas Semiconductor  Dallas, TX
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]
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]
Digital Potentiometers: Frequently Asked Questions -  Maxim Application Notes / 593 / Nov-05....[App Note]
Digital Stereo Potentiometer -  in PDF format, text in Finnish (added 1/03)
Digital volume control-  based on DS1669 Digital Pot IC....[Aaron  Cake]
Digital volume control has log taper -  11-Apr-02 Issue of EDN  Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals. However, most such potentiometers suffer from at least one flaw  a nonlogarithmic step increment. To avoid this problem, a user must usually step the potentiometer in a nonlinear sequence to simulate a logarithmic taper.... [Design Idea by Doug Farrar, Los Altos, CA]
Digitally controlled potentiometer sets cutoff frequency -  06/10/99 EDN-Design Ideas....The traditional method of controlling the upper cutoff frequency in the basic inverting-amplifier circuit of Figure 1 is to add capacitor C in parallel with R2. The value of C controls the cutoff frequency. R1  and R2 independently establish the magnitude of the circuit gain, which.... [Design Idea by Chuck Wojslaw, Xicor Inc, Milpitas, CA]
Digitally Programmable Gain & Attenuation Amplifier Design -  AN-137 Analog Devices Application Notes  (app note added 2/06)
DS1669 Digital Potentiometer -  The DS1669 Dallastat™ is a single digital rheostat or potentiometer with access to all three potentiometer terminals. The potentiometer has 64 wiper positions with equal or linear resistive step sizes.  This device has both positive and negative 8V (max) supply inputs for maximum wiper outputs....(circuit added 07/07/07)

Potentiometers:  #'s - A      B - D      E - L      M - Q       R - Z

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