Examples for suitable 12V -> 5V converters


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Questions and AnswersCategory: Moitessier HATExamples for suitable 12V -> 5V converters
Jürgen Lux asked 1 year ago

Hello, rooco team.
You have written about the differences between different volt converters. Unfortunately everything without type designation. Can you already give a recommendation for a converter?
You wrote that it is often due to the price, this is a hint but not enough for me.
Is there an optical hint on a circuit board, for example certain components which point to little noise?
Which converter works best after your tests?
Greetings Jürgen

Marco Mueller replied 1 year ago

Hi, I also have trouble finding a low noise 12v to 5v step-down.
AIS reception with my power supplies is poor even the voltage is stable (at least on my multimeter). If somebody found a well working ps please share.

2 Answers
Jürgen Lux answered 1 year ago

Hello, rooco team,
Unfortunately my question could not be answered yet. Please give me a buy recommendation.
Apart from the converters, does it help to minimize the noise with ferrite cores?
Greetings Jürgen

Thomas Staff answered 1 year ago

Hello Jürgen,
it is not that easy to give a recommendation for a converter, as noise is caused by several parts in the power supply chain. This might be the power source of your ship, the converter or the Pi itself. Even if you use a low noise converter you might have some reception degradation, if your ship supply is too noisy. However, I would recommend a converter using the LM2596. I use the following part: https://www.neuhold-elektronik.at/catshop/product_info.php?cPath=222_361&products_id=4763
All your systems are powered with a lead acid battery, so no noise from an electric generator. In this combination you wont have any troubles with excessive noise.

Things you could do to improve performance:

  • Use low-noise and high-quality converters –> do not use cheap China converters
  • Mount the antenna as high as possible above sea level
  • Avoid noisy sources next to the receiver (e.g. Wi-Fi router, smartphone, microwave, radio equipment etc.)
  • Use AIS antennas only –> the antenna MUST be specified for the AIS frequency only
  • Keep antenna cables as short as possible and use low-loss cables
  • Only use shielded antenna cables
  • Place AIS antenna as far away as possible from other radio equipment
  • Use ferrite beads on all power supply cables
  • Avoid ground loops

DC/DC convert LM2596


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