Microcontroller multiplexes six digital potentiometers:  05/11/00 EDN-Design Ideas  / (added 2/06)

Microprocessor linear potentiometer deliver echo pulses:  05/12/05 EDN Design Ideas  / (Circuit / schematic design added 6/06)  Simulate radar and sonar returns with simple circuit.

Network Forms Digital to Impedance Converter:  03/14/96 EDN-Design Ideas / (added 03/03) 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 for IC or hybrid implementation, as it calls for only two nominal values. You can prove mathematically that the equivalent capacitance between terminals 1 and 2 is CEQ=2C·(Di·2-i), where Di represents the binary coefficients of the digital-input code....

One Amplifier has two gain figures:  09/19/02 EDN Design Ideas  /  (added 1/05)  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....

Op Amp Increases Potentiometer's Resolution:  06/05/00 EDN-Design Ideas / (Circuit / schematic design added 6/06)

Optical Module Development Platform 2.5 GBPS Transmitter with Digital Diagnostics:  AN-654 - Analog Devices Application Notes  (added 2/06)

Optimizing the Digital Potentiometer in Precision Circuits:  Microchip Application Note - Published 8-May-01   (added 2/06)

PC Based Configurable Filter uses No Digital Potentiometers:  01/23/03  EDN-Design Ideas / (Circuit / schematic design added 6/06) 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 .....

PIC NiCd Battery Charger:  (circuit added 7/02)

Potentiometer tames Current-feedback op amp:  05/11/00 EDN-Design Ideas  / (added 2/06)

Programmable Oscillator uses digital potentiometers #2:  03/07/02 EDN Design Ideas  /  (added 1/05)  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... ...

Programmable Oscillator uses Digital Potentiometers:  AN-580 - Analog Devices Application Notes  (added 2/06)

Pushbutton Switch Controls Power Supply and µC:  09/25/97 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)  Switching handheld units on and off with a pushbutton switch is a desirable feature. Thus, switching-regulator/ controller ICs for battery-powered applications provide a logic input to switch the device to a shutdown mode. This type of shutdown pin can require additional components and logic gates to implement the pushbutton interface. However, a simple circuit can implement an on/off function with no external logic (Figure 1). The circuit is based on IC1's step-down controller, which provides the toggle on/off function internally with a SET/RESET latch. Momentarily grounding the ON pin sets the latch and turns on the regulator; momentarily grounding the LBI/OFF pin resets the latch and turns off the regulator....  

Pushbuttons and digital potentiometer control boost converter:  02/17/05 EDN Design Ideas  / (added 11/05)  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.