Even under extreme overload conditions, like short circuit, the monolithic never delivers more than a fraction of its safe output, while separate circuitry protects the bi-polars. At higher output currents the bi-polars provide the majority of the output current, leaving the monolithic to operate well within its capability and so able to correct any error instantaneously. When output current is less than a few amps, all of the power output comes from the monolithic, maximising the speed and linear properties of this design. This approach in itself is not a new idea, but Linn’s execution of the monolithic to bi-polar transition is truly unique, and a patent application for the design has been submitted. The CHAKRA topology we devised uses an array of large bi-polar transistors as ‘boosters’ around a single monolithic. The Linn 328A required greater power, circuit density and performance than even our reference monolithic power amplifier, the KLIMAX 500 Twin, could offer, and so we began work on developing a solution which performed accurately and consistently in even the most demanding monitoring applications. The CHAKRA topology is the result of more than 5 years of continuous development of Linn’s high-power monolithic amplifier audio circuits, and was initially conceived during development work for the Linn 328A professional monitoring loudspeaker. Monolithic technology is used extensively throughout Linn’s product range, both as single chips and paralleled devices to increase power output.
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