This article explains the principles behind Leslie-type loudspeakers and goes on to describe the construction of a generously proportioned system intended for use with a home constructed electronic organ. The article could provide the starting point from which individual readers could build up a rotating loudspeaker system to suit their own particular requirements.

Rotating System Loudspeakers for Electronic Organs

The most obvious and the routine method of radiating sound from an electronic organ is by means of one or more loudspeakers, suitably and conventionally baffled. In a single-unit instrument, the loudspeaker(s) are mounted behind cutouts, usually in the front panel below the keyboard and above the pedal clavier. While compact and convenient, this arrangement usually suffers some limitation in the effectiveness of the baffling which can be provided and the efficiency with which the sound can be propagated.

Foreword

This is a transcription of my Diploma thesis simply titled “Visual Communication” written in June 2000.

At the time, visual communication was emerging as a compelling and novel field within computer science. Personal computers were just beginning to gain enough processing power to approach — albeit slowly — the capabilities of the mainframes of the era. Digital signal processing was still out of reach for home computers, but the direction was clear: we were heading into a visual era. A few decades later, the “unthinkable” can now be performed on a standard notebook.

A relic project from late ’90s

The Scooter

“Car’s got a lot of pickup.”

As every teenager could enjoy riding a 50 cubic centimeters (1.7 cubic feet) scooter, I was no exception back in the schooldays. Like others, mine too was almost completely modified and not officially road-worthy anymore.