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PBL388141SOT Datasheet(PDF) 11 Page - Ericsson |
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PBL388141SOT Datasheet(HTML) 11 Page - Ericsson |
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11 / 14 page  11 PBL 388 14 Figure 18. Application with ac. volume control. Control F2 F3 F6 F5 F1 PBL 388 14 F4 50 Ω LOUDSPEAKER + 18 4 24 16 1 2 8 6 9 10 13 14 12 11 23 17 + 21 22 + + + + 5 3 15 19 7 20 Tx signal Rx signal + supply 0 V + MIC. 15nF 100nF 47k 50k 1 µF 33nF 4.7nF 100nF 2.2 µF/6V 100 µF 6 V 470 k 150nF 6.8nF 2.2 µF/6V 100 µF 16 V 220nF 820 Ω 150nF 68nF 820 Ω 68nF 68nF 100 µF 6 V Ref. Figure 19. External power amplifier The power amplifier feedback loop can be broken (pinns 19 and 20) thus making it possble to insert external power transistors to increase the audio output power. This enables with external power supply an out- put power of several watts fed into 4 - 16 ohm loudspeaker. See. fig. 19. 22 + 4 - 15 V 4 Ω 19 1000 µF 15n 10 Ω 15n BD131 BD132 PBL 388 14 20 + + - |
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