Jim wrote:

> Subject: Re: [EE]: 7805 regulator current increase
>
> >> I was wondering is is possible to parallel 2 of them
> >> together to double the current out or do I have
> >> to use transistors to increase current?


Where regulators have tight regulation (within 10mV from
0A to 1A), like 7805 etc, you can parallel them with a small
resistor on the OUTPUT. Drop about 30mV on the output at
full current, so about 0.03 ohms is enough. 0.1 ohm
resistors will do if they are all you can get.

Russell McMahon wrote:
>As Patrick noted, you can add a SMALL input resistor to each one to
>encourage them to share the load.

I don't think you can do it with input resistors, they
have to be on the output, as the output is closely
regulated by the opamp in the chip regardless of input
volts. ie, connect one 7805 to 12v and one to 8v, both
will output the same volts, at least within a couple mV
chip tolerance. Resistors must be on the output, and YES
it will work fine.
-Roman

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