9v Regulator?

alexoprice

I have 2 6v lead acid batteries in series and need 9v from that for a pair of DC motors. Does anybody know of a 9v regulator chip and where i can get it? I have seen 5v and 12v but nothing for 9. Any help would be appreciated.

-Alex

Forrest

How much current do you need. A LM7809 9V 1A regulator will cost you less than $1

Hulk

You could pass the current through 5 silicon diodes.· That would subtract about 3 volts.· However,·it would still remove the same voltage when the supply voltage drops as the batteries discharge.· On the plus side, you can get high amp diodes for little money.

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Basic stamp Newbie

Post Edited (Hulk) : 3/10/2006 3:11:44 AM GMT

LoopyByteloose

How about a 7809 voltage regulators controlling a 3055 transistor.
I think you easily get a tightly regulated 9 volts and can go well beyond the 500ma to 1amp limit of most linear regulators.

Take a look at the Manufaturer's PDF for a circuit.

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"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)

······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan

alexoprice

thanks a lot the 7809 looks perfect ordered 2 of them

LoopyByteloose

Oh no!, you can't really use them in parallel.

There is the possilbity of one confusing the other. Eventually, you get a runaway condition.

But, you can separately supply each motor.

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"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)

······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan