Re: [N8VEM-S100:124] call for ECB SBC V2 information

[Douglas Goodall <douglas...@mac.com>]

thanks anyway for responding, I appreciate it.  :-)

Http://Goodall.com


On Mar 16, 2011, at 9:59 AM, Jack Rubin <jack....@ameritech.net> wrote:

> 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
>>>> 
>>>> 
>> 
>>