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Category: Articles
The Quad 405 Current Dumping Amplifier from 1975
The famous Quad 405 ‘Current Dumping’ amplifier was launched in the mid 1970’s, and featured feed forward error correction that effectively removed the class B cross over distortion that plagues this type of output circuit structure. The design featured no adjustments in production, but the circuit components around the output (L2, R36, R38) had…
Michael Kiwanuka: SOA Protection for Audio Power Amplifiers
Power Amplifiers, and especially bipolar output designs, require output stage protection in the event of a fault, or the presence of a heavy or highly reactive load. Michael Kiwanuka explains the intricacies and the design methodology for output stage SOA protection :- Click here to read Michael’s paper
Einstein’s Path to Relativity
This presentation by Jurgen Renn charts Einstein’s journey from his 1905 ‘annus mirabilis’ (‘miracle year’) when he was still a lowly unknown patent clerk in the Swiss Patent Office. Just ten years later in 1915, with the publication of General Relativity, he emerged as the undisputed giant of 20th-century physics. The presentation focuses on the…