From: Joerg Hansmann (info_at_jhansmann.de)
Date: 2001-05-21 12:07:42
Hi,
----- Original Message -----
From: Moritz v. Buttlar <info_at_baltic-microsolutions.de>
To: <buildcheapeeg_at_yahoogroups.com>
Sent: Sunday, May 20, 2001 6:26 PM
Subject: Re: [buildcheapeeg] Optocouplers
...
> > Do you have any idea about the exact position of the 2x9 pinhead connector ?
> > Or should it be extended to more signals e.g. for some digital control lines ?
>
> I think we should use 2x10 connectors. There are 90-degree bended types
> available at Reichelt. I bought some connector pairs and they look quite good :)
90 degree is not quite what I thought of, because I intended an analog-Bus system
(see picture)
> We should put them right in the middle, or what do you think ?
It depends on what is best for the layout.
Could you please post your brd-file as a base for making a decision ?
What about the digital interface for the LEDs and switches. Would it be
advantageous to add these signals to the bus-system ?
It would give the possibility to design other cards, that can easily be connected
to the bus, like a LC-Display unit with keyboard, or a memory card for
storing EEG-data offline, etc.
> Joerg: BTW, I installed PSPICE now (student version) and it seems that itīs even
> possible to add parts (models) and I think thereīs only a 60 parts restriction.
In my Microsim Ev 8 is also a restriction for the number of OP-Amps and transistors.
This was the reason why I have modelled the amplifier input stage
with voltage controlled voltage sources (however this is less accurate,
because it is a very idealized form of an OP-amp) .
> Did you ever try to add parts ?
No. I have only seen, that this is possible with ABM-Blocks. But I do not
have any documentation, how to implement a model.
Regards,
Joerg
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