I have this LIIOn charger schematic using LM317 and TL431, i couldn't find TL431 so i bought ZH431 instead. The problem is that the circuit does not work with ZH431, frustrated i desoldered a TL431 from a pcb and tried it. The circuit started working, charged the battery and stopped as it should..
The strange thing is the circuit works with ZH431 if i insert a multimeter to measure current from OUT pin of LM317 and resistor R1 when the meter is removed the circuit stops working..Is there any difference between ZH431 and TL431. I have read the datasheets and could not find any.
The strange thing is the circuit works with ZH431 if i insert a multimeter to measure current from OUT pin of LM317 and resistor R1 when the meter is removed the circuit stops working..Is there any difference between ZH431 and TL431. I have read the datasheets and could not find any.
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