July 21, 1997 Magazine Archive

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ISSUE DATE: JULY 21, 1997

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Modem front end, Fan control, Etching, OTP-CMOS process, IrDA, PCI, USB

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

July 21, 1997 - In This Issue

[Ideas For Design]
Supply circuitry selects main or backup voltage and disconnects load
A complete portable-equipment power supply, suitable for systems that can be plugged into a docking station, is presented in this circuit idea. When the main supply is removed or falls out of regulation, selector circuitry automatically switches the... — Contributing Author

[Ideas For Design]
Simple soft-start circuit for switching regulators
In the early stages of development, one of the many issues circuit designers must evaluate is how the circuit behaves when power is first applied. Unexpected things can happen at startup. All capacitors must be charged and all ICs change from an... — Contributing Author

[Ideas For Design]
DAC-powered charge pump varies negative rail
The circuit shown provides a low-current, adjustable negative supply rail suitable for use as a sensor bias, LCD-contrast bias, or a VCO tuning supply. By operating a charge-pump doubler from the output of a buffered DAC, it avoids the customary... — Contributing Author

[Ideas For Design]
Printed wiring board short-circuit pin-pointer
The quality of printed wiring boards and other electronic components seems to be improving all the time. As a result, it’s less common these days to see circuit boards with shorts between traces due either to manufacturing defects in boards themselves... — W. Stephen Woodward

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