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February 15, 2007
DESIGN IDEAS
Gain-of-two instrumentation amplifier uses no external resistors
Two ICs deliver precision gain with no external components.
Analog switch converts 555 timer into pulse-width modulator
Added CMOS switch enhances a PWM oscillator. |
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New Handbook Provides Insights into Designing More Cost-Effective Test Systems
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Scroll down for Dilbert
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Drive a blue LED from a 3V battery
Two 1.5V cells and a few components can light a blue LED.
Add simple disable function to a panoramic-potentiometer circuit
Improved control circuit places monaural image in a stereo field.
Simple single-cell white-LED driver uses improvised transformer
Minimal component-count circuit boosts a single cell's voltage to light an LED.
Implement a stepper-motor driver in a CPLD
Replace a hard-to-find stepper-motor-driver IC with a programmable-logic device.
All of the above Design Ideas in a single PDF
Click here for a PDF of all of this issue's Design Ideas.
COLUMNISTS
DRM cripples digital video from PCs to TVs
Insidious forces are trying to prevent users from employing any new TV as a PC monitor.
Analog Domain: The Miller's tale: How to calculate Miller capacitance
Miller capacitance is a feedback element implicit to active devices as different in their operating principles as bipolar-junction and field-effect transistors. It does not appear explicitly as a parasitic in the active device's small-signal model; you can calculate it from the model and from the electrical conditions that the surrounding circuit imposes. |
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Dilbert |
By Scott Adams
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VOTE NOW: 17th Annual EDN Innovation Awards
Cast your votes using our simple online ballot. Voting
continues through Feb. 28, and we will announce the winners at an
awards event April 2 in San Jose.
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