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Sponge Bob
Sponge Bob
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DC-DC isolation for my car stereo... Where do I start?

I recently noticed that my jeep's stereo whines with a frequency that seems proportional to the rpm of my engine (and alternator), and is louder when my headlights are on.

If my stereo was powered by AC electricity it would be no problem to add an isolation transformer, but since I am working with DC I really don't know how to isolate the stero from the rest of my vehicle's power system.

A quick eBay search came up with some small ICs that appear to be DC isolators but none of them exceed 1W - an I have a 200w stereo.

How should I go about isolating my stereo from the rest of my Jeep's electronics? What

Alternatively, What if I were to add a huge cap in parallel with my car battery, would that help keep things smooth? Digikey has an awesome selection If I used five of massive capacitorsthese 3V capacitors in series I would essentially have a 4F, 15v capacitor. Would that be able to prevent noise from my alternator and headlights from affecting my stereo?

DC-DC isolation... Where do I start?

I recently noticed that my jeep's stereo whines with a frequency that seems proportional to the rpm of my engine (and alternator), and is louder when my headlights are on.

If my stereo was powered by AC electricity it would be no problem to add an isolation transformer, but since I am working with DC I really don't know how to isolate the stero from the rest of my vehicle's power system.

A quick eBay search came up with some small ICs that appear to be DC isolators but none of them exceed 1W - an I have a 200w stereo.

How should I go about isolating my stereo from the rest of my Jeep's electronics? What if I were to add a huge cap in parallel with my car battery, would that help keep things smooth? Digikey has an awesome selection of massive capacitors.

DC-DC isolation for my car stereo... Where do I start?

I recently noticed that my jeep's stereo whines with a frequency that seems proportional to the rpm of my engine (and alternator), and is louder when my headlights are on.

If my stereo was powered by AC electricity it would be no problem to add an isolation transformer, but since I am working with DC I really don't know how to isolate the stero from the rest of my vehicle's power system.

A quick eBay search came up with some small ICs that appear to be DC isolators but none of them exceed 1W - an I have a 200w stereo.

How should I go about isolating my stereo from the rest of my Jeep's electronics?

Alternatively, What if I were to add a huge cap in parallel with my car battery, would that help keep things smooth? If I used five of these 3V capacitors in series I would essentially have a 4F, 15v capacitor. Would that be able to prevent noise from my alternator and headlights from affecting my stereo?

Source Link
Sponge Bob
Sponge Bob
  • 5.3k
  • 17
  • 48
  • 65

DC-DC isolation... Where do I start?

I recently noticed that my jeep's stereo whines with a frequency that seems proportional to the rpm of my engine (and alternator), and is louder when my headlights are on.

If my stereo was powered by AC electricity it would be no problem to add an isolation transformer, but since I am working with DC I really don't know how to isolate the stero from the rest of my vehicle's power system.

A quick eBay search came up with some small ICs that appear to be DC isolators but none of them exceed 1W - an I have a 200w stereo.

How should I go about isolating my stereo from the rest of my Jeep's electronics? What if I were to add a huge cap in parallel with my car battery, would that help keep things smooth? Digikey has an awesome selection of massive capacitors.