Recent content by Jefff

  1. J

    Small circuit design

    The crowbar circuit is very interesting, simple and adds good protections for the application. Out of curiosity, don't most oem mobile/ tablet chargers come with built in protections to protect downstream devices? If I were to design a function-first circuit to evaluate component feasability...
  2. J

    Small circuit design

    Thank you. Following the same trajectory, do you see any suitable alternative to the slow blow fuse?
  3. J

    Small circuit design

    Wonderful words of advice. There may or many not be sheep herders involved, I suppose in some instances this could be true. Even with the Reed switch, and schottky reverse polarity diode, is there any reasonable risk that the supply from the charger would damage the circuit? I had planned...
  4. J

    Small circuit design

    It is intended to be plugged into an ordinary mobile charger in any home in the eu. I was simply trying to integrate an additional safety feature with a small footprint and economical. How best to proceed, i don't know, i am inexperienced.
  5. J

    Small circuit design

    Thank you, would you consider the following two protection components insufficient? Slow-blow fuse T500 mA Schottky diode 1N5817 (reverse-polarity protection)
  6. J

    Small circuit design

    Thank you for the clarification. I had meant to suggest that by reducing from 15V to 9V (as you suggested) provides the initial dissipation improvement, but also moving from an LM317 to a 5.8hom resistor would allow for lower V comparitively. Taking these clarifications into consideration, and...
  7. J

    Small circuit design

    Thank you, for all your effort and inputs. As to the recommendations of Karald in an earlier post the components list was revised: USB-C PD charger (9 V PDO, ≥18 W) ZY12PDN USB-C PD trigger (set to 9 V) Slow-blow fuse T500 mA Schottky diode 1N5817 (reverse-polarity protection) 220 µF 16 V...
  8. J

    Small circuit design

    Thank you all for your contributions, I am absolutely pleased with the community involvement on this forum. The heatsink is a great point and I had already considered it as a design element. Additionally, I intend to integrate an SMD miniature Reed Switch NO as a circuit trigger. My next step is...
  9. J

    Small circuit design

    Thanks a lot for the guidance — switching the PD trigger to 9 V makes sense and really helps reduce the wasted heat. I’m also open to replacing the LM317 with the 8.5 Ω / 1 W series resistor, but since I’m still new to electronics, could you please explain a bit more clearly why the resistor...
  10. J

    Small circuit design

    Hi everyone, I’m new to electronics (I’m more of a mechanical person), and I’m trying to put together a small UV-C disinfection box. I’ve done some research and picked parts that I think make sense, but I’d really appreciate help checking the feasibility, choosing the right resistor/capacitor...
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