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| Created | July 26, 2022 |
| Last modified | July 26, 2022 |
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Detect a possible difference of tension of up to 24 volt through LED. Since LED cannot tolerate a large difference of voltage in reverse, I added Zener diode as protection to limite that possible reverse voltage to the LEDs. The original problem stated that each rail can be, independently, at +12V or at -12V
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