Using the spare time I had today I partially assembled a PortaLED PCB, as I had all the parts on hand. This time, I put in a one ohm resistor for the current sense resistor instead of 0.3 ohms to reduce the drive current to make the circuit work with the tiny inductor (which actually had a
saturation current of 250mA, while my original design wanted to run at 630mA; I only noted the
current rating of 1.9A). I didn't put in the microcontroller and tied the enable pin high. I also didn't put in the battery/USB switchover MOSFET/diode combination out of laziness. I just wanted to test to see if the circuit would work as a basic light and if there was really nothing too wrong about my design from before.
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Mostly soldered board. |
And it did work!
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Assembled. |
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Stacked boards to form a case. |
Plenty bright enough at this drive current. Charger works fine, just don't have it plugged in when on.
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This one photo refused to be uploaded by Google Photos.
Not sure why I only get partially uploaded. |
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