Rank: Member
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Joined: 8/4/2008(UTC)
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Location: Maryland
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Received a new Placid HD last week and built it at the weekend. Measured the trim pots for resistance with no problem and was able to adjust them, then I applied power. All LED's lit up and no smoke (always a bonus), however I cannot seem to be able to adjust for voltage and current. I am getting 13.8v out of it but no matter how much I turn the pot I cannot raise it or lower it, same for the other one in order to adjust current. The pots seem to adjust OK before I applied power, when I was measuring resistance. Checked all my solder joints and as far as I can tell they are all OK. Any ideas??
Colin
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Rank: Administration
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Sounds like you either have some transposed transistors, or the current diode is reversed.
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Rank: Member
Groups: Member
Joined: 8/4/2008(UTC)
Posts: 17
Location: Maryland
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Last night I checked the board over again and found I had missed soldering one leg of R12. Do you think that could've done it? Other than that the transistors are correct as is the current diode.
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Rank: Member
Groups: Member
Joined: 8/4/2008(UTC)
Posts: 17
Location: Maryland
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That fixed it. Working wonderfully now.
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