February 22, 1999 Magazine Archive

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ISSUE DATE: FEBRUARY 22, 1999

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Open-frame dc-dc converter, ISSCC '99, Java, Embedded Systems East Conference, Spectrum analyzers

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

February 22, 1999 - In This Issue

[Ideas For Design]
PC's Interrupt Measures RPM
This simple design measures the speed in RPM of a rotating wheel by using the PC’s special BIOS interrupt INT1CH and its printer interrupt IRQ4. An infrared optocoupler mounted on the wheel side... — Contributing Author

[Ideas For Design]
Add Self-Detection To Serial Devices
Perhaps one of the most popular methods for communications between a personal computer and an external device is serial asynchronous communication, based on the RS-232 standard. The external... — Contributing Author

[Ideas For Design]
Miniature Temperature Monitors Drive 3-Speed Fan Controller
Combining a switch-mode dc-dc controller with two low-cost temperature monitor ICs produces a three-speed fan controller (see the figure). This useful... — Contributing Author

[Pease Porridge]
Bob's Mailbox
Dear Bob: Your characterization of Bipolar illness and Mania missed the mark a bit (Electronic Design, Dec. 1, 1998, p. 131). These problems are not merely attitudes that are somehow... — Bob Pease

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