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LM4610N Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LM4610N Datasheet(HTML) 9 Page - National Semiconductor (TI) |
9 / 11 page Applications Information (Continued) DC CONTROL OF NATIONAL 3D-SOUND AND LOUDNESS CONTROL Figure Figure 16 shows a possible circuit if electronic control of these functions is required. The typical DC level at pins 3 and 22 is 7.5V (V CC=12), with the input signal superim- posed, and this can be used to gias a FET switch as shown to save components. For switching with a 0V - 5V signal a low-threshold FET is required when using a 12V supply. With larger switching levels this is less critical. The high impedance PNP base input of the loudness control pin 9 is readily switched with a general purpose NPN transistor. DS101125-37 FIGURE 16. Application Circuit with Electronic Switching www.national.com 9 |
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