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Old 19th September 2003, 02:31 PM   #11
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Can you switch to 7812 instead of 78L12?

You can probably connect them brutally in parallel because they have current limitation but they are not indestructable. If you add resistors they will probably share current better but if they don't misbehave without resitors, don't use them.

Switch to 7812 seems to be a better solution if that's possible.
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Old 19th September 2003, 02:37 PM   #12
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ummmmm...the series resistor goes on the input

the 78 series regulators have built in current limiting so the resitors on the input act as a current sharing load

and I reccomend a pass transistor also
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Old 19th September 2003, 02:48 PM   #13
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I would recommand a bigger reg rather than a pass transistor. Easier to implement
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Old 19th September 2003, 02:49 PM   #14
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a pass transistor is cheaper and you don't have to worry about one regulator hogging the current. In fact, you can get a linear regulator to oscillate even without trying. (Nat Semi does have an application note showing the LM317 as a switching regulator!)

In talking to one of the customer service techs at Nat Semi they did indicate that some customers used some of their Simple Switcher Regulators "stacked", but they did not recommend it.
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Old 19th September 2003, 03:01 PM   #15
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Default Pass transistor it is

Then Pass Transistor is is!

I thought that maybe this would be a simple quick Solution!

Thanks AnyWay Everybody
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