April 20, 1998 Magazine Archive

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ISSUE DATE: APRIL 20, 1998

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EM simulation, Programmable DSPs, Web-based design, Cellular/PCS, FPGAs, Embedded CPUs

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Browse Archived Articles By: Issue | Author | Department | Topic

April 20, 1998 - In This Issue

[Design Application]
Use Programmable DSPs For Cost-Effective PCI Digital Audio Design
— Contributing Author

[Design Application]
DVD Encoding Complexity Drives Embedded CPU Core Choice
— Contributing Author

[Ideas For Design]
Optically isolated precision bipolar current source
One of the most frequently requested instruments in the field of in-vivo and in-vitro neurophysiology research is the galvanically isolated neural stimulator. Applications in this field require an accurate, voltage-programmable, bipolar current source... — W. Stephen Woodward

[Ideas For Design]
Current-sensing LDO voltage regulator
When designing battery-operated devices, battery contact chatter can be prove to be a difficult problem to overcome. When the chatter occurs at a critical time, the results can often be devastating. For instance, if a memory write takes place during a... — Contributing Author

[Ideas For Design]
Programmable speed control targets stepper motors using 8254
This design idea describes a basic speed controller for stepper motors implemented by programming a common 8254 programmable counter timer IC. The speed control of the stepper motor is achieved by varying the OFF time in its clock’s duty cycle. All... — Contributing Author

[Ideas For Design]
Adjustable LNB power supply is DiSEqC-compatible
The circuit shown provides a digitally switchable 13 V or 17 V for the low-noise block (LNB) typically found in satellite receivers at the antenna feedhorn. This variation of supply voltage “tells” the remotely located LNB electronics whether it... — Contributing Author

[Ideas For Design]
Transformerless EL display driver uses lower-voltage 555 IC
The 555 timer has been manufactured in greater volumes than any other linear IC. Regarded by many as one of the most successful devices of all time, the 555 timer is perhaps only equaled in popularity by the 741 op amp. The success of the part can be... — Contributing Author

[Pease Porridge]
What's All This Floobydust Stuff, Anyhow? (Part 6)
Well, it's time for another assortment of miscellaneous, or what I like to call "Floobydust" topics. But first, let's start with the solution for Puzzler 1 that ran in the last issue.... — Bob Pease

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