Please help me with it.
i have 1.2 v DC battery with current 2500mA.
Can any one tell me up to how much i can amplify voltage? But current should be atleast 500mA.
And also tell me how to make it.
Can you please provide the following information for me to help you better?
1. What supply voltage do you need? Single supply (ex: +5V, 0V) or dual supply (ex: +5V, -5V)?
2. What ouput voltage do you expect? Let's say you want 6V output. The gain that you can apply to your 1.2V input is 5. Giving me this information will let me help you pick the amplifier that has your desired gain.
3. Is the 1.2V your only input voltage or do you have other input sources?
By "amplify", do you mean you would like to convert the 1.2 volts from your NiMH cell to, (for example) a 3.3 volt source that can power a 500mA load? If so, then your question relates not to the signal-processing ability of amplifiers, but rather to the power-conversion principle of switching regulators. To get started, look up boost converter in Wikipedia.
You may find it easier to start with a slightly higher voltage, for example, 2.4V from two NiMH cells in series. There's a greater variety of simpler circuits that can operate at this level. This would also allow for higher output voltages, perhaps up to 12 volts DC. ADI makes some integrated circuits for this function -- you may find help with these by asking your question in the Power Management section of Engineer Zone.
As Bob suggested this is some related to power management.
The ADP1607 boost regulator can generate a bias voltage (2.5V) for another boost regulator like the ADP1612.
In this case the the ADP1612/13 can boost to 3.3V or 5V from the battery by being powered from the ADP1607.
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