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When the dimmer is at 50% power, the switches are switching their highest voltage (>325 V in Europe) and the sudden surge of power causes the coils on the inductor to move, creating a buzzing sound associated with some types of dimmer; this same effect can be heard in the filaments of the incandescent lamps as "singing". The suppression ...
Thyratron dimmers were manufactured under license from Strand Electric of England. [29] All this started to change in 1958. In 1959 the first commercially viable solid state theatre dimmer, Kliegl's SCR(R), was introduced as model R59. [45] [46] Improved models followed. Within two years, the solid state dimmer had, as a practical matter, swept ...
The RJ45S, an obsolete standard [9] jack once specified for modem or data interfaces, has a slot on one side to allow mating with a special variation of the 8P plug: a mechanically-keyed plug with an extra tab on one side that prevents it from mating with regular (non-keyed) 8P jacks. The visual difference from the more-common 8P female is subtle.