voltage to current converter in single supply.

[HIREN DAVE]

Hi,


I have 1 source that gives me 10V and 2mA. I want 5V and 10mA from this supply.. I have no other source. Is there any technique to increase current by decreasing a voltage????

 

[ericgibbs]

hi Hiren,

Consider the 'power' of those two V/I's

10 *.002 = 20mWatt

5 * 0.01 = 50mWatt

Cant get more power out than in....

E.

 

[HIREN DAVE]

ok. got it...

Now, my another question is I have a point source of 0.75V and 1.3mA. From this source, i want to generate 3.3V and 750mA. Is there any other option to get these much voltage except increasing no. of sources???
1 option is to use around 2461 sources and connect it to series or parallel to generate this much voltage. Any other option???

 

[Diver300]

ok. got it...

Now, my another question is I have a point source of 0.75V and 1.3mA. From this source, i want to generate 3.3V and 750mA. Is there any other option to get these much voltage except increasing no. of sources???
1 option is to use around 2461 sources and connect it to series or parallel to generate this much voltage. Any other option???

Not really. You certainly need around 2500 times the power of the source.

 

[HIREN DAVE]

ok. thanks... any other idea or option???

 

[alec_t]

You would have to use series and/or parallel combinations. There is no other way.

 

[HIREN DAVE]

ok...

 

[ericgibbs]

hi,
You have not said what the voltage sources are.

If the internal resistance of each cell is high, at 750mA load current, the internal resistance of a series chain could be a problem.

 

[unclejed613]

post #3 sounds like a small solar cell, or an LED.... you would need a lot of those in a 5x577 series-parallel array to get the voltage and current you're looking for.... that's 2885 of them. that's also a lot of soldering. you could probably have a 5x10 array slowly charge a battery, and use the battery to provide the power if the circuit doesn't require being powered on all the time.