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A transistor is a semiconductor device that can amplify signals and switch power. The types that are used most are BJT (Bipolar Junction Transistor), UJT (Unijunction Transistor), and MOSFET (FET, for Field Effect Transistor).

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How does this circuit work (OpenTherm)?

I am trying to understand how this data interface works. It's supposed to: translate (read) "OT" current difference into logical OUT (<10mA = 0, >17mA = 1) send logical IN to "OT" by varying the vo …
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