Minimum_component_bridge_amplifier_with_quiescent_balance_control

Published:2009/7/23 20:14:00 Author:Jessie | From:SeekIC

The quiescent output voltage of the LM380 is specified at 9 ±1V with an 18-V supply. Therefore, under worst-case conditions, it is possible for the circuit of Fig. 1-37 to have 2-V across the load. With an 8-Ω speaker, this 0.25 A of direct current might be excessive. Three alternatives are available:1) take care to match the quiescent voltages, 2) use a non-polar capacitor in series with the load (speaker), 3) use the offset balance control (Fig. 1-38).



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