An OCL amplifier (output capacitor-less amplifier) is any audio amplifier with direct-coupled capacitorless output. Typically, OCL amplifiers can be any of several amplifier classes, and typically have a push–pull output stage. Advantages of OCL amplifiers over capacitor-coupled amplifiers include
Avoiding the cost and bulk of an output capacitor Better immunity to motorboat oscillation Greater output power at very low frequencies and DC Disadvantages of OCL amplifiers include
Larger power dissipation and passing DC through the load, in the minority of designs with poorly controlled DC bias point Increased sensitivity of the output DC bias point to process variations, although the last disadvantage is less important for older bipolar processes.
Implementations LM4910 by National Semiconductor Lab tutorial on OCL amplifier from Hong Kong Polytechnic University Archived 2008-12-30 at the Wayback Machine
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