Hi all,
I've monitored both voltage and amperage for my PDA while it charged on a AC to DC charger and found that the voltage started somewhere around 7.2 volts and the amperage around .59mA. The specs on the PDA DC charger were 8.4v and .6mA output. Approx one hour and twenty minutes later (est.) voltage went up to 8.4 and amperage dropped to Zero. The last 20 minutes amperage was approx. .2mA or less.
My question is, Can I create a circuit that will light a green LED when amperage drops to Zero? This would not be the only lithium Ion battery that will be charging on this 12v DC cigarette lighter receptacle so DC voltage draw may vary depending on the device. I think the only constant I can count on is that amperage will drop to zero or almost zero when any lithium ion battery is charging. I think I'm approaching this the right way.
Thanks for any help.
I've monitored both voltage and amperage for my PDA while it charged on a AC to DC charger and found that the voltage started somewhere around 7.2 volts and the amperage around .59mA. The specs on the PDA DC charger were 8.4v and .6mA output. Approx one hour and twenty minutes later (est.) voltage went up to 8.4 and amperage dropped to Zero. The last 20 minutes amperage was approx. .2mA or less.
My question is, Can I create a circuit that will light a green LED when amperage drops to Zero? This would not be the only lithium Ion battery that will be charging on this 12v DC cigarette lighter receptacle so DC voltage draw may vary depending on the device. I think the only constant I can count on is that amperage will drop to zero or almost zero when any lithium ion battery is charging. I think I'm approaching this the right way.
Thanks for any help.