68Views5Replies

Author Options:

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

Discussions

The forums are retiring in 2021 and are now closed for new topics and comments.
0
john mantova
john mantova

6 years ago

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

0
caitlinsdad
caitlinsdad

6 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.

0
john mantova
john mantova

Reply 6 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

0
john mantova
john mantova

Reply 6 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

0
steveastrouk
steveastrouk

6 years ago

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