CLIPPING_POINT_INDICATOR

Published:2009/6/30 21:21:00 Author:May | From:SeekIC

Uses LED to indicate when clipping distortion begins in 50-W power amplifier. Display circuit is referenced to negative supply, making detection level Indopendent of supply variation; circuit thus works equally well for instantaneous, music, or continuous overloads. Tr1 is normally turned hard on and Tr2 is off. When overload makes collector-emitter voltage of lower amplifier output transistor approach saturation, Tr, begins to turn off and @, charges through D, so LED turns on. Attack time is chosen to make single 3-ms overload transient visible.-J. Dawson and K Northover, L.E.D. Clip Indicator, Wireless World, Jan. 1976, p 60.



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