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Ramaswamy Ramkumar
 Dr. Ram earned his M.Sc in Physics from Delhi University in 1990 and his PhD in Operations Research from the Indian Institute of Management Calcutta in 1994. He built his first audio amp at the age of 12 using the popular TBA810 which, much to his delight then, instantly became a local MW receiver too. While as a pragmatist he believes that digital technologies have replaced analog largely for the better, he rues the fact that some of the best principles of analog design, such as the principle of minimalism which it implicitly embodies, are slowly dying away. His passion for audio electronics finds expression in Audesine (www.audesine.com), through which he provides audio system design and prototyping services. |
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A Universal Continuous-Time Active Filter
 For loudspeaker design and prototyping you’d want a simple, flexible system to ‘play’ with the crossover. You would want a simple way to vary cross-over frequencies, filter characteristics and levels. Cheap and flexible DSP solutions are available for the final implementation, but for prototyping it would be better to just be able to turn some controls and switches and listen to the changes in real time rather than input changes in a software application and then listen to the incremental changes. RR as he prefers to be called developed exactly such a flexible analog cross-over that’s a great tool for the speaker designer, allowing continuously-varying cross-over frequency, on-the-fly transfer function change and custom-implementation of your choice of transfer functions. The author can also supply PCBs and a professional-looking front panel to help building this versatile unit. |
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Ramaswamy Ramkumar
