Subject:
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Re: power source
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 13 Feb 2002 20:08:32 GMT
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Viewed:
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695 times
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Mathias Uhr wrote:
>
> if you use an unregulated supply, you need to add a big capacitator
> in front of the ic (after rectifing of course)!
>
> you will probably come to the conlusion that it is easier and safer
> to buy a power supply that is cleanly regulated to 9v dc...
What I meant when i said "unregulated" was a power supply without a 78xx
in it. The power supply that I am using consists of a transformer,
rectifier (4 diodes) and a 4700uf cap. This means that while it does
give a clean voltage, that voltage is too high (14v). This is why i am
using a 7809. Therefore, it was not easier to buy a power supply that
gives exactly 9v (ie one with a 7809 in it), because they're impossible
to find.
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Message is in Reply To:
 | | Re: power source
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| hi! (...) if you use an unregulated supply, you need to add a big capacitator in front of the ic (after rectifing of course)! generally, they advice to use an electrolyt capacitator of sufficient size (there are formulas for this) for filtering and (...) (23 years ago, 13-Feb-02, to lugnet.robotics)
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