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Digital / Logic Circuits Page 5b
Last Updated on:
Wednesday, December 31, 2008 03:16 PM |
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| Links to electronic circuits, electronic schematics, designs for engineers,
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Digital Current Source is Nonvolatile: 02/07/02 EDN Design Ideas / (added 1/05) Digitally programmable
current sources that feature automatic trimming and retain the setting despite power-down cycles are useful in applications such as RFand laser-communications drivers. The circuit in Figure 1, for
example, is particularly suited for setting the drive current for the optical pump in widely tunable VCSELs (vertical-cavity surface-emitting lasers). ... |
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Digital Data Signal Crosstalk on the Clock (Part 3): Maxim Application Notes / 1842 / Oct-05 (app note added 6/06) |
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Digital Delay Unit for Surround Sound: (schematic / circuit design added 9/02) |
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Digital Dial: (electronic circuit added 4/05) |
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Digital Dimming DALI Ballast for 32w/T8 110V Input: This reference design is a high efficiency, high power factor, digital
dimming electronic ballast designed to drive rapid start fluorescent lamp types. The design contains an active power factor correction circuit for universal voltage input as well as a ballast
control circuit using the IR21592. The design also includes a PIC16F628 microcontroller and an isolation circuit for connecting to a Digitally Addressable Lighting Interface (DALI). (added
3/05) |
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Digital Dimming DALI Ballast for 36w/T8 220V Input: This reference design is a high efficiency, high power factor, digital
dimming electronic ballast designed to drive rapid start fluorescent lamp types. The design contains an active power factor correction circuit for universal voltage input as well as a ballast
control circuit using the IR21592. The design also includes a PIC16F628 microcontroller and an isolation circuit for connecting to a Digitally Addressable Lighting Interface (DALI). (added
3/05) |
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Digital Electronic Lock: (electronic (schematic / circuit added 11/05) |
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Electronic Lock (circuitdb): The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The first 4 outputs from the
CD4017 decade counter (pins 3,2,4,7) are gated...(added 02/07) |
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Digital Engine/Race Computer Board: The objective of this project is to design a high speed digital engine tachometer. This
requires the design and development of a hardware and software solution to monitor the status of an engine in real time. In addition, information relating to the overall health and systems of the
vehicle can be displayed. (added 10/05) |
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Digital Filter Makes Simple SPICE Eliminator: 04/10/97 EDN-Design Ideas / (added 3/03) |
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Digital Guitar Tuner: (electronic circuit added 4/05) |
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Digital Hardware Debug and System Integration: Improving Hardware and Software Debug of Digital Systems Symposium: Agilent
Application Note (app note added 6/06) |
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Digital Mains Voltage Indicator: (electronic Circuit / Schematic added 10/04) |
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Digital Modulation in Communication Systems: An Introduction: Aligent App Note (added 2/06) |
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Digital Noise Reduction Techniques for Combo Ii: National Semiconductor Application Note (app note added 2/06) |
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Digital PC Oscilloscope: (circuit added 7/02) |
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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 2/06) |
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Digital Position Encoder Does Away withADC: 05/08/97 EDN-Design Ideas / (added 3/03) |
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Digital Pot Adjusts Lcd's Contrast: 02/04/99 EDN-Design Ideas / (added 5/03) 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 from a menu and then use up or down
buttons with µC IC1 to adjust the contrast. The µC stores the contrast value in the digital potentiometer, IC2. This design uses a Xicor 10-k unit (dubbed "EEPOT"), but you could use other devices
in the design. The EEPOT connects to the LCD's VO line. You could connect.... |
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Digital Pot Corrects for System Drift: 11/10/94 EDN-Design Ideas / (added 3/03) 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 (see "Autocalibrator nulls dc offsets," EDN, June 9, 1994, pg 139, and "Infinite-hold circuit zeros out
long-term drift," EDN, March 3, 1994, pg 90).... |
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Digital Potentiometer Autonulls Opamp: 10/22/98 EDN-Design Ideas / (added 3/03) |
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Digital Potentiometer Controls LCD Bias: 03/17/94 EDN-Design Ideas / (added 03/03) 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 is a 64-step potentiometer available in 10-, 50-, and 100-kV ranges. The up-count (UC) ..... |
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Digital Potentiometer Controls Phase Shift: 02/15/96 EDN-Design Ideas / (added 3/03) |
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Digital Potentiometer Programs and Stabilizes Voltage Reference: 05/30/02 EDN Design Ideas / (schematic / circuit added
11/03) 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.. |
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Digital Potentiometers Enable Programmable Biquadratic Filter: 07/22/04 EDN Design Ideas / (added 11/05) 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... |
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Digital Potentiometers: Frequently Asked Questions: Maxim Application Notes / 593 / Nov-05 (app note added 6/06) |
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Digital Quality Microphone Pre Ampl. using the Model 425 Opamp : (electronic diagram added 6/03) |
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Digital Remote Thermometer: Remote sensor sends data via mains supply Temperature range:00.0 to 99.9 °C (added 9/04) |
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Digital Resolver Integration: AN-234 Analog Devices Application Notes (app note added 2/06) |
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Digital Signal Controls Sine Generator: 05/15/03 EDN Design Ideas / (added 1/05) The circuit of Figure 1
produces an accurate, variable-frequency sine wave for use as a general-purpose reference signal. It includes an eighth-order elliptic, switched-capacitor lowpass filter, IC3, which uses a 100-kHz
square-wave clock signal that microcontroller IC2 generates. (Any other convenient square-wave source is also acceptable.... |
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Digital Signal Processing with the PIC16C74: Microchip Application Note Published 26-Aug-97 (app note added 2/06) |
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Digital Signal Processor (DSP) for Radio Communications: (electronic circuit added 7/03) |
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Digital Signals Produce Pure Sine Waves: 10/09/97 EDN-Design Ideas / (added 3/03) |
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