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Monday, October 03, 2011 06:07 PM
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
Constant Current Constant Voltage Converter Drives White LEDs: 09/02/04 EDN
Design Ideas / (added 11/05) LEDs usually take their drive from a constant
dc-current source to maintain constant luminescence. Most dc/dc converters, however,
deliver a constant voltage by comparing a feedback voltage to an internal reference
via an internal error amplifier. The easiest way to turn a simple dc/dc converter into
a constant-current source is to use a sense resistor to convert the output current to
a voltage...
Designing High Current Chokes is Easy: 06/24/04 EDN Design Ideas /
(added 11/05) Somewhat unusually, this Design Idea deals with a formula rather
than a circuit. You might think that all the basic formulas of magnetic phenomena were
discovered more than a century ago. In fact, they probably were, but, at the time,
some were of little practical interest and were essentially disregarded and never
included in books or formula tables.
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...
Embedded Processor Directly Drives Lcd: 01/09/03 EDN Design Ideas /
(added 1/05) Driving a bare LCD does not necessarily require specialized
interface circuitry or peripherals. This Design Idea describes an alternative drive
scheme, which you can easily implement using the general-purpose outputs of a
microcontroller. Many embedded-system applications need to interact with a user by
displaying simple numeric or alphanumeric characters....
Excel Offers Painless LCD Initialization: 09/20/01 EDN Design Ideas /
(added 1/05) To display a font or a symbol on an LCD, you need to convert the
desired character into numerical data. Creating the data for an entire font set
requires specialized tools; even with these tools, the task can be daunting.
Alternatively, you can build a font calculator using an Excel spreadsheet. ...
Filtersfree Program Designs and Analyzes Passive and Active Filters:
02/05/2004 EDN-Design Ideas In low-noise analog circuits, a high-gain
amplifier serves at the input to increase the SNR. The input signal level determines
the input-stage gain; low-level signals require the highest gain. It is also standard
practice in low-noise analog-signal processing to make the circuit's bandwidth as
narrow as possible to pass only the useful input-signal spectrum. (added 10/05)
Frequency Source Feeds Entire Lab: 01/23/03 EDN Design Ideas /
(added 1/05) Plumbing a laboratory with a standard frequency makes a lot of
sense if the lab uses multiple frequency counters, spectrum analyzers, and other
frequency-dependent test equipment. Rather than spending time keeping all of the
instruments' oscillators in calibration or buying expensive, high-precision
oscillators, you can use the circuit in Figure 1 to distribute a single calibrated
frequency sou......
