headphone monitor amp

Posted on Feb 4, 2014

This simple amplifier is ideal for adding a headphone jack to equipment that lacks this feature. The Headphone Buffer circuit board is small enough (1. 2` X 1. 4`) to squeeze into even the smallest spaces and power requirements are so low that existing supplies in retrofitted gear can be used. It`s a useful addition to many PAiA products such as the

headphone monitor amp
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Submixer or Submix-Master. Adding a headphone output turns a Stack-In-a-Box it into an incredible practice amp. The key component is the 5532 Dual OpAmp. While ordinarily this part is chosen for it`s low noise characteristics, it is also capable of delivering nearly 350mW of output power per side, more than enough to drive headphones. The circuit can operate from bipolar voltages from +/-5V to +/-18V and it is not absolutely necessary that the + and - supply voltages be the same magnitude. The superior supply voltage rejection of the IC allows operation with unregulated supplies. In the typical mono application such as adding headphones to a FatMan or Theremax, the Left and Right inputs of the amp are both connected to the Volume control supplied with the kit. For stereo applications a dual ganged pot should be used and this modification is covered in the instructions.

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