.:madworm:.'s photos
PWM generator added
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Works nicely - once the soft-start capacitor has been removed and a 10k pull-down resistor has been added.
Yummy bacon
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Yummy bacon
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He's dead Jim!
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The DIM input of the PT4115 is very susceptible to over-voltage - even from a high-impedance source (skin resistance, bridging DIM to VCC).
ChipQuik to the rescue
Green on black
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Triplet
A bit lof light
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The datasheet says 6V max on the DIM pin... just like on a 5V AVR chip. BUT there don't seem to be any protection diodes in the PT4115. I managed to kill two by accidentally bridging the DIM-pin to the VCC-pin. Not with a wire, but with a finger. Skin resistance was low enough to kill the chip ;-( I've added a 5V1 Zener and a 1k series resistor to the next version.
More Light
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Gloomy
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LORK - Light & Cork
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Led Square - done!
Reflow attempt
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I have ceran hot plates, which essentially are strong IR heaters, so I just placed the board over it with some distance and played with the dial to simulate the temperature profile for SMD reflow. In the end I just set it to max and turned it off after all parts were done.
Successful reflow
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I was terribly afraid of frying the bottom of the board, but it survived unscathed. The ground-plane conducted the heat nicely.
Warm-white LED + paste
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White LED + paste
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Adding solder paste
Foolproof marking?
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I guess I won't mistake it for something edible, but solder paste kind of looks like anchovy paste (which I hate).
