title: OCL amplifier
text: # OCL amplifier
  
  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
  * larger 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
  