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  1. B

    In need of help with my bridge-type ac/dc converter power supply

    Find the book “the art of electronics” or the ARRL handbook and use index to lean about power supply design
  2. B

    Need help with a malfunctioning Hitachi BCL1415

    Buy new 18XXX cells and a low cost capacitor type spot welder and replace them all. Look on YouTube and observe safety precautions to avoid fire from shorting the cells.
  3. B

    Help with multiple cracked Lead Acid UPS Batteries

    You must know the heritage of all used batteries, for example were they overcharged? What is the DC value when fully float charged - is a cell shorted? Shorted cells (due to sulfination) can lead to high internal temperatures and how bad this becomes depends on the system charging circuitry...
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    Load Test for CR2032 Lithium Batteries

    Look at the various types of Lithium primary cell battery shunt impedance in their data sheets. These Li coin cells differ from other lithium primary cell types that are intended to source higher current ‘pulsed’ loads, for example 123 or CR2, intended for high current flash photography lamp...
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