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There is a 3 pin SOT-89 package IC DC step up that converts 1.5 V to 3.3 V as shown in the picture.

My questions are:

  1. Does anybody have a link to the datasheet of the 433p?
  2. How does this circuit work?

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    \$\begingroup\$ Is the device marked 433p on top? Please provide a photo of it. \$\endgroup\$
    – winny
    Nov 20, 2023 at 7:26
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    \$\begingroup\$ An inductor across the output O_o \$\endgroup\$ Nov 20, 2023 at 7:47
  • \$\begingroup\$ postimg.cc/0KY8YNWy \$\endgroup\$
    – Ali
    Nov 20, 2023 at 12:42

1 Answer 1

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How this circuit works?

It doesn't work; it's incorrectly drawn or transcribed. You can't have an inductor with 3.3 volts on one terminal and 0 volts on the other terminal because it will short out the 3.3 volts. Somewhere you have made a mistake.

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  • \$\begingroup\$ It is strange GND connected to output .Normally inductor is in serie with input but as you can see in the picture attached link there is a component right of diode that is short circuit with ohm check and i think it is inductor , may be it is capacitor but why it is short circuit , bythe way the picture is attached postimg.cc/0KY8YNWy \$\endgroup\$
    – Ali
    Nov 20, 2023 at 10:41
  • \$\begingroup\$ @Ali It looks more like a capacitor to me and anyway, in-circuit measurements of components is not a reliable way to measure. \$\endgroup\$
    – Andy aka
    Nov 20, 2023 at 11:40
  • \$\begingroup\$ @Ali if we are done here, please take note of this: What should I do when someone answers my question. If you are still confused about something then leave a comment to request further clarification. \$\endgroup\$
    – Andy aka
    Nov 23, 2023 at 11:29

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