mini active loudspeaker - good sound reproduction at low cost

As the title implies, this project is not intended to make hi-fi buffs sit up, but rather to meet the many requests for a simple active loudspeaker that can be connected direct to the headphone output of small cassette players and FM receivers. mini active loudspeaker elektor march 1985 mini active loudspeaker The main requirements our designers were asked to meet were: reasonably small dimensions, not too expensive to build, active operation, and good quality sound reproduction. Furthermore, it had to be a loudspeaker system that could be constructed by anyone, which also meant that the integral amplifier had to be kept simple. The result is a perfectly accept- able concept which leaves room for some variation, dependig on personal preferences and available materials. Purely from a quality point of view, an enclosure of about 7 x45/8 x 31 /8 in. (18 x 12 x 8 cm) cannot be claimed to have more than a modest specification and yet it is surprising how well this small unit behaves, p...