I should point out that all I posted are more or less singular events. It was one PAM2803 that released smoke, one successful rebuilt FastTech driver, one built HQb15v1 that did not work as expected (3 modes, mode change works, but flickering in all modes). I can’t explain what happened or went wrong. It’s not that I was setting up test series here…
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The PAM2803 that died was on a Nanjg110. I had only 2 more at hand at the time and did not want to lose them. Then the FT board arrived and I went with them - including the reistors.
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The resistors (that I dubbed R2 and R3) are, as @wight pointed out, only present on the boards with MCU. They were not needed when I tested the BAT60A on a single mode Nanjg110 (post#35). But I don’t know what these resistors are there for on the FastTech driver.
R2 (“18D” = 150kOhm) is between LED+ and GND.
R3 (“103” = 10kOhm) is between FetSource/PAMpin3/Rsense and FetGate/PWMsignal.
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The HQb15v1 I did model after the successful FT conversion. Can’t say whether I misdesigned it, a part is defect or I did a bad (rework-station-) solder job. Next weekend might show, hopefully.
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I started using Eagle in summer ’14, installed it on 2 PCs and have never seen anything but a white background. Needless to say, I’m simply used to it.
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I’m aiming for 1AA and 2AA operation, 2AA for several Mini Maglites which can so nicely be converted to a triple using a modded P60 pill. Very family friendly for those I don’t want to burden with lithium-ion cells.