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The process of taking a completed system and determining details of its design by analysing it; may have legal limitations or ramifications in different jurisdictions.

1 vote
0 answers
77 views

How to drive base of an NPN with a reverse-connected diode?

The circuit schematic belongs to controller board of a some kind of heater device. I reverse engineered it from the board itself and checked it three times. Its function is so simple: You adjust durat …
kemal's user avatar
  • 155
0 votes
1 answer
46 views

SMD component on a dotmatrix printer driver board

This SMD (code: 327G) is mostly used between data lines from the microprocessor and (possibly) some solenoids of a dot matrix printer. So it should be some switching device. I redraw related part of …
kemal's user avatar
  • 155