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Potentiometer Circuits, Page 4
Potentiometers:  #'s - A      B - D      E - L      M - Q       R - Z
Last Updated on: Friday, October 03, 2014 10:38 AM

Circuits Designed by Dave Johnson, P.E. :
  • Pot Controlled Variable LED Intensity Circuit
    The circuit below uses power from four rechargeable AA NiMH cells to drive 3 white LEDs.  A potentiometer varies the duty cycle of a pulse width modulator circuit to vary the intensity of the LEDs from 0% to 100%.  The beauty of the circuit is that when the pot is all the way toward 0%, very little power is drawn from the battery.  Likewise, when the pot slider is moved toward the 100% end, full power is fed to the LEDs.  In effect, the pot becomes the on/off switch....

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
MicroController multiplexes six Digital potentiometers -  05/11/00 EDN-Design Ideas.... EDN is migrating links. This link is not verified.  Google the "title" + EDN for new link.
Microprocessor linear potentiometer deliver echo pulses -  05/12/05 EDN-Design Ideas....Simulate radar and sonar returns with simple circuit.... EDN is migrating links. This link is not verified.  Search the "title" + EDN for new link.
Network Forms Digital to Impedance Converter -  03/14/96 EDN-Design Ideas....The circuit in Figure 1 resembles a capacitive-ladder (C-2C]D/A converter. However, it does not provide conversion from a digital code to a voltage or current, but rather converts the digital code to a capacitor value. The C-2C topology is well-suited.... EDN is migrating links. This link is not verified.  Google the "title" EDN for new link.
Nonvolatile digital potentiometer gates logic signal -  3-Sep-07 Issue of EDN  A novel use for digital potentiometers employs them as a logic gate that functions as soon as the system powers up.... [Design Idea by Reinhardt Wagner, Maxim Integrated Products, Ottobrunn, Germany]

One amplifier has two gain figures -  19-Sep-02 Issue of EDN  The single-supply circuit in Figure 1 is an inverting amplifier with two outputs—one for positive output voltages, VOUT(POS], and the other for negative output voltages, VOUT(NEG]. Steering diodes D1 and D2 split the amplifier, IC1, output into the two output polarities relative to the 2.... [Design Idea by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA]

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OpAmp Increases Potentiometer's Resolution -  06/05/00 EDN-Design Ideas....A key parameter of digitally controlled potentiometers (DCPs] is the number of taps (n] programmable positions of the wiper.  This parameter establishes the resolution in  programmable-voltage and -current applications. A number of circuit....PDF has many circuits, please scroll to find this one.... [Design Idea by Chuck Wojslaw, Xicor Inc, Milpitas, CA, and P Gareth Lloyd, Elab Ltd, Stoke-on-Trent, UK]
Optical Module Development Platform 2.5 GBPS Transmitter with Digital Diagnostics -  AN-654 Analog Devices Application Notes  (app note added 2/06)
Optimizing the Digital Potentiometer in Precision Circuits -  Microchip Application Note Published 8-May-01  (app note added 2/06)
PC-based configurable filter uses no digital potentiometers -  23-Jan-03 Issue of EDN  Modern instrumentation requires digital control signals. These signals come from a central microprocessor or, in modern context, the popular parallel or serial PC ports. In recent times, digital potentiometers have eliminated the hassles from this interface for the analog section. Designers can replace the resistors of the analog design with digital potentiometers, thus providing the necessary.... [Design Idea by Saurav Gupta and Tejinder Singh, New Delhi, India]
PIC NiCad Battery Charger -  Circuit designed by Peter Hayles.  This cheap and easy to build NiCd/NiMH Battery Charger is suitable for automatically charging a wide range of batteries for many applications. Proper chargers are usually expensive and cheap chargers supplied with the original equipment often incorrectly charge the cells and dramatically shorten their life....(added 10/05)
Pot Adjusts LCD's Contrast -  02/04/99 EDN-Design Ideas....  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 t....File contains several circuits, please scroll down for this one.... [Design Idea by Jef Collin, CSE Systems, Turnhout, Belgium]
Pot Controlled Variable LED Intensity Circuit -  The circuit below uses power from four rechargeable AA NiMH cells to drive 3 white LEDs.  A potentiometer varies the duty cycle of a pulse width modulator circuit to vary the intensity of the LEDs from 0% to 100%.  The beauty of the circuit is that when the pot is all the way toward 0%, very little power is drawn from the battery.  Likewise, when the pot slider is moved toward the 100% end, full power is fed to the LEDs.  In effect, the pot becomes the on/off switch.... [Designed by David A. Johnson]
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 potentiometer, IC1, becomes a variable set-point reference that can adapt to the long-term drift of the variable measured. The potentiometer replaces schemes involving A/D and D/A converters.... EDN is migrating links. This link is not verified.  Google the "title" EDN for new link.
Potentiometer Autonulls OpAmp -  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.... [Design Idea by Stephen Woodward, University Of North Carolina, Chapel Hill, NC]
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]
Potentiometer Controls Phase Shift -  02/15/96 EDN-Design Ideas....You can use dual, quad, or hex potentiometers to put all phase-shift sections under control of a microprocessor, as in Figure 2. The DS1806 hex digital …. EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Potentiometer Model -  ....(spice design added 02/09)
Potentiometer Programs & Stabilizes Voltage Reference -  05/30/02 EDN-Design Ideas....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.... EDN is migrating links. This link is not verified.  Google the "title" EDN for new link.
Potentiometer tames Current feedback OpAmp -  05/11/00 EDN-Design Ideas....The circuit in Figure 1a includes a potentiometer in series with the inverting input of a current-feedback op amp. With a voltage-feedback op amp,.... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
potentiometers enable Programmable Biquadratic filter -  07/22/04 EDN-Design Ideas....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]….... EDN is migrating links. This link is not verified.  Search the "title" EDN for new link.
Potentiometers: Frequently Asked Questions -  Maxim Application Notes / 593 / Nov-05....[App Note]
Programmable Gain & Attenuation Amplifier Design -  AN-137 Analog Devices Application Notes  (app note added 2/06)
Programmable oscillator uses digital potentiometers -  7-Mar-02 Issue of EDN  Digital potentiometers are versatile devices; you can use them in many filtering and waveform-generation applications.  This Design Idea describes an oscillator in which setting the resistance of two digital potentiometers independently programs the oscillation amplitude and frequency. Figure 1 shows a typical diode-stabilized Wien-bridge oscillator that generates accurate sine waves fro.... [Design Idea by Alan Li, Analog Devices, San Jose, CA]
Pushbutton Switch Controls Power Supply  & µC -  11/19/98 EDN-Design Ideas....For manual control of analog signals, it's hard to beat the venerable precision multiturn potentiometer's simplicity, resolution, and power-off nonvolatility. When digital control of an analog parameter is the design objective, a universe of DACs is available to the designer.... [Design Idea by Stephen Woodward, University of North Carolina, Chapel Hill, NC]
Pushbuttons and digital potentiometer control boost converter -  17-Feb-05 Issue of EDN  Digitally controlled potentiometers are useful for generating analog control voltages under the control of a microcontroller. In some applications, manual pushbutton switches could replace a microcontroller and simplify product design. Mechanical switches exhibit contact bounce, and, when a user actuates them, they may open and close many times before reaching a stable state.... [Design Idea by Simon Bramble, Maxim Integrated Products Inc, Wokingham, UK]

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

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