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Rajsbom

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  1. Rajsbom
    HI, Voltage @ Pin 11 and 12 should be 4.5V, if not then check If zener diode is shorted or installed reverse, or IC is shorted.
  2. Rajsbom
    You may use adjustable Voltage DC-DC converter such as LM2576-ADJ, LM2596-adj , play with NTC + Divider Resistor at feedback you may get it https://www.ti.com/lit/ds/symlink/lm2576.pdf?ts=1679379636858&ref_url=https%3A%2F%2Fwww.google.com%2F
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  4. Rajsbom
    This inductor is made using POT Core, value Approx. 640uH to 680uH will work, current could be 100mA, you may try Drum Core Coil from Mouser Part No 80-SBCP-80HY681H https://www.mouser.in/ProductDetail/KEMET/SBCP-80HY681H?qs=pfd5qewlna7zBsC5r9mWjg%3D%3D Or you may make one using POT Core, Value approx. 680uH , Current 100mA or less https://www.digikey.com/catalog/en/partgroup/p-core-type/50202
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