CMOS latchup, was H2 robot
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Posts: 46,084
Al,
I read the article, and looked up a few more. Unfortunately, I'm still not
quite sure what to do. Place a 1N914 diode in series with the + side of the
PAK? And with the shottky diode shown in that article, what is VL? VDD is
the + side, correct?
Also, I should have a diode across the servos, right?
Thanks for the help, I have a feeling that this is the problem.
Jonathan
www.madlabs.info
Original Message
From: "Al Williams" <alw@a...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, June 28, 2003 8:33 PM
Subject: RE: [noparse][[/noparse]basicstamps] The Hygrogen Fuel Cell Robot Project
> A 10K is fine. For latch up, read this excellent article:
> http://www.analog.com/library/analogDialogue/archives/35-05/latchup/
>
> Al Williams
> AWC
> * Easy RS-232 Prototyping
> http://www.al-williams.com/awce/rs1.htm
>
>
>
> >
Original Message
> > From: Jonathan Peakall [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=KAKgMxFohMLOc-cwcDNbWsk2fzOkDv7vROA4b9P2EM4izwcxZtp0OmDRysXQYHgpJ_suD77_ZnRbub8]jpeakall@m...[/url
> > Sent: Saturday, June 28, 2003 10:31 PM
> > To: basicstamps@yahoogroups.com
> > Subject: Re: [noparse][[/noparse]basicstamps] The Hygrogen Fuel Cell Robot Project
> >
> >
> > Al,
> >
> > > 1. Be sure to decouple the chip very close to the IC with a .1 and
> > > even a .01uF cap. Yes, capacitance in parallel adds, but
> > with RF, you
> > > are providing alternate paths to ground which is a good thing.
> >
> > Done that, both values actually, ceramic caps right across
> > the chips. I've been meaning to scope the board and see how
> > noisy it is.
> >
>
>
> To UNSUBSCRIBE, just send mail to:
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Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
>
I read the article, and looked up a few more. Unfortunately, I'm still not
quite sure what to do. Place a 1N914 diode in series with the + side of the
PAK? And with the shottky diode shown in that article, what is VL? VDD is
the + side, correct?
Also, I should have a diode across the servos, right?
Thanks for the help, I have a feeling that this is the problem.
Jonathan
www.madlabs.info
Original Message
From: "Al Williams" <alw@a...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, June 28, 2003 8:33 PM
Subject: RE: [noparse][[/noparse]basicstamps] The Hygrogen Fuel Cell Robot Project
> A 10K is fine. For latch up, read this excellent article:
> http://www.analog.com/library/analogDialogue/archives/35-05/latchup/
>
> Al Williams
> AWC
> * Easy RS-232 Prototyping
> http://www.al-williams.com/awce/rs1.htm
>
>
>
> >
Original Message
> > From: Jonathan Peakall [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=KAKgMxFohMLOc-cwcDNbWsk2fzOkDv7vROA4b9P2EM4izwcxZtp0OmDRysXQYHgpJ_suD77_ZnRbub8]jpeakall@m...[/url
> > Sent: Saturday, June 28, 2003 10:31 PM
> > To: basicstamps@yahoogroups.com
> > Subject: Re: [noparse][[/noparse]basicstamps] The Hygrogen Fuel Cell Robot Project
> >
> >
> > Al,
> >
> > > 1. Be sure to decouple the chip very close to the IC with a .1 and
> > > even a .01uF cap. Yes, capacitance in parallel adds, but
> > with RF, you
> > > are providing alternate paths to ground which is a good thing.
> >
> > Done that, both values actually, ceramic caps right across
> > the chips. I've been meaning to scope the board and see how
> > noisy it is.
> >
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
>