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+-- Forum: Pinecil (https://forum.pine64.org/forumdisplay.php?fid=162)
+--- Forum: General Discussion on Pinecil (https://forum.pine64.org/forumdisplay.php?fid=163)
+--- Thread: 12v Watts? (/showthread.php?tid=13852)
12v Watts? - Enthalpy0 - 05-08-2021
Just got my pinecil and it looks good. Did a quick test with lead free solder and it worked fine.
The only barrel 5.5 mm power supply I had in the house was 12 volts. (no USB C in the house either) With my temperature set up to 360 C it barely maintained it that hot. I put a watt meter on the AC electric side if the cord and it showed a maximum of 19 watts, even though the 12 vDC converter can deliver 3 amps. . . 36 watts.
I see in the wiki in the QC discussion, it says 12v will only deliver 18 watts. I assumed that was a QC limitation. Is the 18 watts at 12 volts always a limitation? (I’ll go read some datasheets)
RE: 12v Watts? - Enthalpy0 - 05-09-2021
(05-08-2021, 03:09 PM)Enthalpy0 Wrote: Just got my pinecil and it looks good. Did a quick test with lead free solder and it worked fine.
The only barrel 5.5 mm power supply I had in the house was 12 volts. (no USB C in the house either) With my temperature set up to 360 C it barely maintained it that hot. I put a watt meter on the AC electric side if the cord and it showed a maximum of 19 watts, even though the 12 vDC converter can deliver 3 amps. . . 36 watts.
I see in the wiki in the QC discussion, it says 12v will only deliver 18 watts. I assumed that was a QC limitation. Is the 18 watts at 12 volts always a limitation? (I’ll go read some datasheets)
aaaah, never mind, I see Ralim answered it in the other pinecil forum, I didn't check the 'accessories' pinecil forum. Ohms Law. It surprises me that the pinecil 'looks' like a simple 8.5 ohm resistance. It all adds up now.
12v/8.5ohm = 1.4 amps
1.4 * 12 v = 17 watts
I'll probably cut and wire up an old laptop charger to the 5.5 mm barrel adapter.