Re: gEDA-user: 74xx series

[Karel Kulhavy <clock@twibright.com>]

On Fri, Jun 25, 2004 at 05:36:22PM +0200, Levente KOVACS wrote:
> > 1) Implicit connections are good when they help minimize the crowding
> > of a schematic.
> 
> ...
> 
> > 3) Implict connections are bad for high speed analog where you want to
> > 
> > filter the devices power from the boards power.
> 
> 
> I think even a normal TTL gate generates noise on the top of the power
> supply lines. It's better to filter it. So, anyway, it's better to have
> thoes pins visible.
> 
> I've seen IC sockets coming with a 100nF capacitor soldierd to the
> traditional corner pins.
> 
> Not to mention high frequency analog devices. You should not just filter
> the noise from the supply to the chip, however you should filter the
> generated noise coming from the chip, to the power line.
> 
> I often use circuit like this...

What values of left C, right C and coil do you typically use for HC
logic family?

I am using 100nF coupled with 1nF in Ronja Twister and Ronja AUI Forte without
the coil in the middle.

Cl<