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resistor replacement Answered

 I have a small model battery charger which has a resistor burnt out . output is 7.5  volts  according to the label which sounds right as pack is 7.4volts.  measured voltage from transformer  is 15 volts Can anyone tel me what value resistor I need to drop the  voltage  to 7,5 v or whatever the actual out put shoul be. thanks people, john mantova

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john mantova

4 years ago

1200mah Nicds Smallish helicopter.battery No transistors just diodes and a resistor

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caitlinsdad

5 years ago

V = I R, ohm's law. I think there might be some circuitry like a power transistor or chip there to drop and regulate the voltage. A simple resistor would get pretty hot.

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john mantovacaitlinsdad

Reply 4 years ago

Vis all we have @at 15 v from transformer no transistors only diodes. Resistor burnt out beyond readability shorted output leads I suspect.. So you are partly right the resistor did get hot but not during normal charging approx 1200 mah

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john mantovacaitlinsdad

Reply 4 years ago

Vis all we have @at 15 v from transformer no transistors only diodes. Resistor burnt out beyond readability shorted output leads I suspect.. So you are partly right the resistor did get hot but not during normal charging approx 1200 mah

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steveastrouk

5 years ago

What kind of battery is it charging ? Do you know the capacity of the battery ?