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02-22-2011, 11:30
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| Junior Member Join Date: Jun 2006
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| About TC45 GSM Module charging problem Hello. I am using TC45 GSM Module in one of my project.Here are the schematic. GSM Schematic http://img207.imageshack.us/i/gsmt.jpg Power circuit http://img11.imageshack.us/i/gerilim.jpg/ I used this circuit before without battery. And there was no problem. My problem is: I am connecting the battery (3.7V 2000mA Li-ion) and the power supply (18V 4A). In the first 10 seconds everything is OK. The circuit uses 160mA. But when the GSM Module connected to the network the circuit starts to use 2-2.5A for 1-2 seconds and then goes down to 0. And this cycle goes on like this. And the voltage goes downs to 2-3V. It is changing between 2V to 5V. When I reject the battery everything is OK again. What can be the problem? |
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