Subject:
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Re: 4.5v upgraded to 9v - ideas welcome.
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Newsgroups:
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lugnet.trains
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Date:
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Mon, 9 Feb 2004 18:31:11 GMT
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Viewed:
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1416 times
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In lugnet.trains, Ralph Hempel wrote:
> > Hany little thing. I'm finding it VERY useful to bring 12 volt DCC down to 9
> > volt LEGO without losing torque.
>
> Just remember to limit the current through the Zener diode when dropping
> the voltage...
>
> If you have a 12V supply and try to put a 9V zener without a dropping
> resistor, it will simply burn out.
>
> A zener diode is really a clamping device. Better to use a standard
> 780x liear regulator...
Well yes, that goes without saying. You need to protect your DCC function output
from exceeding it's milliamp limit. With the Zenner it just makes your
resistance required to be far less. As an example 50 ohms as apposed to 200
ohms.
Dean
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Message has 1 Reply:
Message is in Reply To:
 | | RE: 4.5v upgraded to 9v - ideas welcome.
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| (...) Just remember to limit the current through the Zener diode when dropping the voltage... If you have a 12V supply and try to put a 9V zener without a dropping resistor, it will simply burn out. A zener diode is really a clamping device. Better (...) (21 years ago, 9-Feb-04, to lugnet.trains)
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