Op Amp Class A adaptor with bypassing - diyAudio
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Old 11th November 2007, 06:29 PM   #1
diyAudio Member
 
Join Date: Oct 2006
Lightbulb Op Amp Class A adaptor with bypassing

Here is a fast and effective way to try Class A biasing on any existing circuit without making any modifications to the equipment. It also provides proper power supply bypassing so your opamps will be operating at full potential. High quality NPO/COG bypass caps are surface mounted very close to the supply pins for best RF rejection. This will allow a more open sound, as the Op Amp is no longer trying to work on signals other than your audio (like the noises injected from a poorly bypassed power supply). Also employs special ultra- low ESR solid SMD ripple filter caps that do not wear out like electrolytics! If your existing equipment should posess superior bypassing, omit any components you see fit and just use the Class A current sources.

One may select bias resistors to suit design goals. The suggested resistor for audio applications at standard +/-15V supplies is 4.7k.
I will have PCB's available to sell.
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