Re: [N8VEM-S100:123] call for ECB SBC V2 information

[Jack Rubin <jack....@ameritech.net>]

Sorry, I only built the early SBC and that was a while back. I'll have to leave 
your other questions to someone else.

Jack



----- Original Message ----
> From: Douglas Goodall <douglas...@mac.com>
> To: n8vem...@googlegroups.com
> Sent: Wed, March 16, 2011 10:37:35 AM
> Subject: Re: [N8VEM-S100:123] call for ECB SBC V2 information
> 
> @Jack,
> 
> Battery BT1. there is no info on voltage ?
> 
> In regards to  the SBC V2, C24 - C28 appear to be electrolytic, but I
> cannot find (on the  wiki or the schematic) any specs ie. Voltage...
> 
> Capacitor C1 is listed as  C1V5, can I assume this means electrolytic 5v?
> Capacitor C31 is listed as  "22uF C1V5", does this mean electrolytic 5v also?
> 
> What is the nature of  diode D2?
> 
> I guess resistors R3 through R8, and R10 are ghosts?
> 
> If  I understood these mysteries, I could proceed onward with confidence.
> 
> Any  help would be appreciated.
> 
> Douglas
> 
> 
> On Mar 16, 2011, at 7:10  AM, Jack Rubin wrote:
> 
> > Douglas,
> > 
> > You're probably  referring to the multiple "bypass" capacitors which limit 
> > spiking on  fast responding TTL logic. They are generally "monolithic" type 
>in 
>
> > the  .1 to .01 uF range. Color varies depending on vendor and packaging spec, 
>but 
>
> > they are are often yellow-orange in color, though I've often used  bright 
>blue 
>
> > ones as well. On older S100 boards (1980's vintage), these  were often 
>ceramic 
>
> > disk capacitors, same value but physically quite a  bit larger, again in a 
> > variety of colors. Orange, red and green were  common.
> > 
> > Jack
> > 
> > 
> > 
> > ----- Original  Message ----
> >> From: Douglas Goodall <douglas...@mac.com>
> >>  To: n8vem...@googlegroups.com
> >>  Sent: Wed, March 16, 2011 8:29:14 AM
> >> Subject: [N8VEM-S100:121] call  for ECB SBC V2 information
> >> 
> >> Hi friends,
> >> 
> >> I am building my first SBC V2. I am already impressed with   the card 
format
> >> due to its small size and weight. I think these  Eurocards are  very nice.
> >> 
> >> I bought most of what I  needed from Jameco, and I am writing  up a new
> >> Jameco parts  list with part numbers... Most of the parts I  understand, but  
>I
> >> am a little confused about the capacitors. The few pictures   I have found 
>of
> >> built up boards appear to have little blue  rectangular  capacitors, which I 
>am
> >> not familiar  with.
> >> 
> >> It would be very helpful if  someone could  provide a close-up photo of a
> >> built up board, and some more   explicit information about the capacitors.
> >> 
> >> I have so  many questions about  small details of construction that would  
>be
> >> answered by a good  photograph.
> >> 
> >>  There are a variety of documents on the wiki about the SBC,  but most of 
> >> them are two years old, and pre-V2. As soon as I get critical   mass on 
this
> >> board, I will write up a very complete how-to with  explicit  parts 
lists...
> >> 
> >> Can someone help me out a  little with this  please?
> >> 
> >> Douglas  Goodall
> >> 
> >> 
> 
>