Constant Voltage amplify current

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fireball003

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Hi,
How can I amplify current where voltage remains constant?

Thanks a lot.
 

Use unity gain buffer (voltage follower) ..
The main reason to use one of these widgets is to sit between a source which can only provide a very small amount of current and a device which requires a moderate amount of current to operate ..
Because the op-amp's input resistance is very high, the op-amp's input only draws a very small current ..
However, since the op-amp itself can draw current from its own power supply, it will be able to supply the next device in the chain with the required amount of current for operation ..

Regards,
IanP
 
The current mirror is the most simple current amplifier.
 

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