12v 7v converter

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Is it nessessary the downsize the voltage to 7v to prevent overheating? The Arduino is places in a small waterproof box. If yes, can I simply solder an converter like this one to the cable or should it be on a circuit board?

If you run the Arduino from a lower voltage its regulator will run cooler. If you use a DC-DC converter rather than a linear regulator you will reduce the current drawn from the data-logger too…. The Arduino on-board regulator has to dissipate Vin As MarkT has said, lower volts is lower heat but if you only require minimal current, it may not be enough to worry about. If I sum up the declared values from the datasheet of each device the maximum current draw would be round about mA.

The sd board requires by far the most. When I powered the Arduino with a powerbank with 1A output everything worked fine. MarkT: If you use a DC-DC converter rather than a linear regulator you will reduce the current drawn from the data-logger too I want to use a linear regulator.

So if the Logger has an output of 1A, 1A should get into the arduino right? To power the SDcard you'll need an external 3V3 regulator anyway, the on-board 3V3 regulator isn't normally rated for SDcards which pull a lot of current when written. If you are doing high precision analog stuff you will need a linear regulator to avoid noise, but DC-DC converters are fine for digital circuitry. Well, my linear regulator only costs 0,59 cents.. The guy at the electronic store recommended it.. For a first test i would try this one, because heat inside the enclosure doesn't matter as long as the arduino, the RTC und the SD breakout board aren't affected.

Measurements are taken outside. MarkT: To power the SDcard you'll need an external 3V3 regulator anyway, the on-board 3V3 regulator isn't normally rated for SDcards which pull a lot of current when written. Using the linear regulator will just move some of the heat loss from the Arduino to the regulator, it will still consume the same amount of power. Unless the regulator on the Arduino-board is scorching hot, there is absolutely no problem in powering it with 12V.

It looks like you have an 78L05 regulator there - to use it you need to feed it's output voltage to the 5V-pin on the Arduino, and not the DC-jack or Vin-pin, which requires 7 volt or more for the Arduino to function properly. Furthermore it's very important to solder two small capacitors on the regulator - as a rule of thumb 0. Caps on voltage regulator.