Electrical – Running 9v battery in parallel with Power Supply

batteriesfilterparallelpower supplyripple

I am putting a 9v powered circuit into an electric guitar. It will be powered by a 9v power supply through a cable, and also have a backup 9v battery on board the guitar. I am wondering if I could run the power supply and battery simultaneously in parallel, to accomplish 3 main goals:

  1. Although the power supply has filters, it needs to be as ripple-free as absolutely possible, as any ripple will be audible as noise. will the battery help to smooth the power supply's delivery? This is the main goal.

  2. I am hoping the power supply will keep the battery charged, will this be the case?

  3. I want to simplify switching and avoid having to manually switch power supplies.

Thanks

Edit: essentially, I am trying to replicate a car charging system, where the alternator and battery run in parallel – the alternator float charges the battery, while the battery smooths any voltage spikes from the alternator, and if you disconnect the alternator the battery will keep the system running.

Best Answer

While this is not the answer to your explicit question, I must address the larger question: how can I minimize noise in my circuit? Yours is a good example of an xy problem. You need to do x, you've settled on y as a solution, and want help in doing y. What you really need is to address x.

And the most basic answer I can give is: get somebody who knows how to design amplifiers (or whatever your circuit does) have a go at fixing yours. There is simply no good reason nowadays for power supply ripple to show up in an output.

As an alternative answer: Get somebody who knows something about power supplies provide you with a new 9-volt power supply. One with negligeable ripple. Trust me, it's not hard to do.

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