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Projects in the October 1999 issue of EPE Magazine

The QWL Loudspeaker
- Originally designed for ETI readers back in 1988, we present an updated version of this Quarter Wave Loaded loudspeaker with improved drivers and matching crossover network. It has a very small "footprint", and its intriguing tall design means that no floorstand is required.

Practical Oscillator Designs - 4: our comprehensive hands-on tutorial series this month covers negative resistance oscillators.

PIC 16F87x Mini Tutorial - understand and use these new chips, guided by our specially-written tutorial feature.

PIC 16F87x Mini Tutorial by John Becker. First published October 1999. PDF 470k.
Micro power supply
- uses an LDO voltage regulator, provides a well-regulated 5V rail even if your battery's nearly flat!
Interior Lamp Delay
 - for car courtesy lights (domelight), this PIC-powered device incorporates a lights-on alarm and a battery saver, which activates when a door is left open for more than five minutes.
Mains Cable Detector
- An effective design which detects the 50Hz "mains hum" signal produced by a buried mains cable, rather than attempting to detect the mass of the copper conductor beneath.