This is Part 2 of a 3 part series.
Here is Part 1 - Finding the Gems
Stay tuned for:
Part 3 - Cleaning and touch-up
Amplifying circuitry can be made better without more complexity and without more feedback. The best part of this for do-it-yourselfers is that these are things that can be done on your own bench, costing mostly just the time it takes to tweak the circuit and evaluate the results. Moreover, this approach is not seen on the factory floor - for most manufacturers it's simply too time consuming to do, and the rest probably never heard of it.
As audio/video hobbyists, most of us grew up thinking that if we have an amplifier with 50 watts of rated output power into 8-ohm speakers, and that combination produces reasonably clean and loud music, then by doubling the amplifier power to 100 watts per channel, the system would then play twice as loud. Many readers likely still believe that. Not so.
As far back as 1940, with Walt Disney's production of "Fantasia", surround sound has been a concept that nearly everyone finds exciting. Consumer electronics tried to take advantage of surround for music in the early 1970s with various forms of quadraphonic sound. It never really became a mainstream success, however, due to limited recorded software and much more expensive phono cartridges or tape decks needed to play it back.
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