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'[PIC]: Need help with a stupid problem and a comme'
2002\05\30@152053 by Tal Bejerano - AMC

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Thanks 2 All for your responses....

MY BIG Mistake! I calculate the input voltage for some reason 9V!!! instead
of 18V! (9v x 1.41 12.70v) and use 16V!! caps.
s**t! these early morning hours kill me!

And a comment to John Dammeyer : refer to National semiconductor data sheet:
"Required if the regulator is located more then 3" from the power supply
filter. which is not the case here.

Regards

Tal Bejerano
AMC - ISRAEL


{Original Message removed}

2002\05\30@154133 by John Dammeyer

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>
> And a comment to John Dammeyer : refer to National
> semiconductor data sheet:
> "Required if the regulator is located more then 3" from the
> power supply
> filter. which is not the case here.

Trust me.  Use the bypass capacitors.

John


>
> Regards
>
> Tal Bejerano
> AMC - ISRAEL
>
>
> {Original Message removed}

2002\05\30@154330 by uter van ooijen & floortje hanneman

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> And a comment to John Dammeyer : refer to National semiconductor data
sheet:
> "Required if the regulator is located more then 3" from the power supply
> filter. which is not the case here.

Although you are correct with respect to the datasheet, it (almost) never
harms to include some extra decoupling, the maybe 100 cap's you will waste
over your lifetime will sooner or later save you hours of frustration. And
in the same line: *always* include a fools diode (1n400x) over each power
supply, to short it when it sudenly turns out to have the opposite of the
intended polarity (note: when your power supply is heavy, like a switcher
from a PC, you will need a bigger diode).

Wouter van Ooijen
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2002\05\31@054637 by Alan B. Pearce

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> And a comment to John Dammeyer : refer to National semiconductor data
sheet:
> "Required if the regulator is located more then 3" from the power supply
> filter. which is not the case here.

yes that is according to the data sheet, but I always put a 0.1uF tiny
ceramic from output to ground and often input to ground without even
thinking about how long the wires are.

It is one of those things you do because if you leave them off, it may work
correctly or it may give you trouble, and it is easier to do away with the
latter right from the start than try to debug it later when it is giving
strange side effects that are hard to track down.

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2002\05\31@061132 by Tal Bejerano - AMC

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Alan

I took your advice and add 4 caps 0.1 to input and output.
if trouble occur I can take if off.

Regards

Tal Bejerano
AMC - ISRAEL


{Original Message removed}

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