Re: A prospective s.s.t.c. input-synchronizer (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Gerry Reynolds <greynolds@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Wed, 20 Dec 2006 14:27:30 -0800
From: K. C. Herrick <kchdlh@xxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: A prospective s.s.t.c. input-synchronizer (fwd)

These are all excellent points -- and I may well have to re-wire some of 
my 5V-common circuits.  But my immediate problem is the anomalous Fr 
(see my other posting this date); when & if that's fixed, then I'll go 
after the "fuzz".

KCH

Tesla list wrote:
> Original poster: Gerry Reynolds <greynolds@xxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Tue, 19 Dec 2006 20:49:48 -0600
> From: Steve Ward <steve.ward@xxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: A prospective s.s.t.c. input-synchronizer (fwd)
>
> Hi Ken,
>
> It may be either a grounding issue, or it could be possible that the
> noise isnt real.  Putting ceramic caps on every IC V+ and ground
> should normally be good enough.  Make sure that you dont have any high
> currents flowing through the 5V ground.  If the 5V circuit is grounded
> to anything else, be sure to use "star" grounding, and the 5V circuit
> is just a branch on the star, and not the center.
>
> You probably already know all this, but you did welcome suggestions,
> and hopefully it will get you started on figuring out the problem.
>
> Steve
>
> On 12/19/06, Tesla list <tesla@xxxxxxxxxx> wrote:
>   
>> Original poster: Gerry Reynolds <greynolds@xxxxxxxxxx>
>>
>>
>>
>> ---------- Forwarded message ----------
>> Date: Tue, 19 Dec 2006 11:28:54 -0800
>> From: K. C. Herrick <kchdlh@xxxxxxx>
>> To: Tesla List <tesla@xxxxxxxxxx>
>> Subject: Re: A prospective s.s.t.c. input-synchronizer
>>
>> Chip, Steve Ward (& all)-
>> ----------------------------------------------------------
>>
>> Hi Ken.
>>
>> Sorry for the delay.  I got slammed at work and didn't end up on the
>> computer last night.  Here's the link.  It's just plain right now but can
>> be fixed up to have html in it later. I just wanted to get it done.  Sorry
>> for the delay again.
>>
>> Chip
>>
>> http://www.pupman.com/current/kcherrick/tch-synctest4a.jpg
>> ------------------------------------------
>>
>> No problemo; looks perfect as-is.  And to all:  The above link is the replacement circuit for my synctest2.jpg that I'd posted
>> previously on hot-streamer.  This one seems to work in the hardware.
>>
>>
>> And Steve...in further response to yours of 12/18: My low-level EMI
>> problem appears to stem from a 14 MHz transient that appears on the +5V
>> bus every time the H-bridge switches.  I'm now trying to track that
>> down.  Suggestions on that from >>anyone<< are welcome!!
>>
>> KCH
>>
>>
>>
>>
>>     
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