Automatic level control and peak valve indicator - has integrated circuit to provide overload prevention and to maintain correct operating levels

摘要

A stereo magnetic tape recording system has a regulating circuit to indicate peak values to avoid overload and provides automatic control of the recording level.S The system has two identical channels (1,2) that are coupled to a common reference voltage source (3). Both channels are also coupled to a circuit (4) that generates signals for the automatic regulation system. The circuit contains a pair of input transistors (5,6) and an output transistor (9). Each channel has difference and reference transistors (10,11) together with a threshold value transistor (12).