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Posts tagged identification

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Q&A Identification of semiconducting electrical components

We identify semiconducting electrical components this way: The first digit represents the number of pn junctions inside the semiconducting device The two or more digit number starting at position...

1 answer  ·  posted 9mo ago by MissMulan‭  ·  last activity 5mo ago by Jasen‭

75%
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Q&A What is this metal panel under power lines?

I was hiking around the Berkshires in western Massachusetts yesterday, and came across this metal panel where some power lines were crossing a ridge: The panel is a few meters wide, and appe...

1 answer  ·  posted 1y ago by Olin Lathrop‭  ·  last activity 1y ago by DSI‭

Question identification
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Q&A Name of this current limiting device

I'm trying to modify a LED torch, and there is a DC-DC booster (1.5 V to 3.3 V) and after that some SOT-23 device which (I assume) keeps constant 90 mA current through LED. I know I could remove th...

2 answers  ·  posted 2y ago by Chupacabras‭  ·  edited 2y ago by Chupacabras‭