hubble Posted July 3, 2011 Report Share Posted July 3, 2011 Hi Sir, I am quite new to electronics. I have a modem (from Teracom) powered by 12v(DC) 1.5Amps adapter. I want to run this modem using a 12v battery which needs to be automatically charged using 230V 50Hz AC power. I came across many schematics when searching on the internet. Following are the two links I think we can start with:http://www.circuit-projects.com/battery/charger-circuit-for-6v-or-12v-car-battery.htmlhttp://electronicsuite.com/power-supply-2/12v-car-battery-charger-suite/#axzz1QP3aTqRgI have a 12V 4.5Ah battery. Can you please help me start designing the circuit?Thanks. Quote Link to comment Share on other sites More sharing options...
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