Recent content by ray merrick

  1. ray merrick

    Ozito 14.4V Li-On charger circuit

    yes it may be a switcher. I have designed many myself. i found it strange the short B/C..confused me for a while. The pcb was discoloured.. its been hot. I replaced it with a TO-220.. 10watt device. 1.8ohm B/C and 10ohm C/E.. cooked.
  2. ray merrick

    Ozito 14.4V Li-On charger circuit

    had a friend here at work with ozito cordless drill. Battery not charging. So i checked the battery and charged it on a power supply. Came up fine. 18 volts. So the problem is in the charger. Simple thing, 2 transistors and LM431. and the series pass transistor shorted Base/Collector I traced...
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