[sdiy] Re: LVM

[Roy J. Tellason]

On Tuesday 16 November 2004 06:27 pm, you wrote:
> Quoting "Roy J. Tellason" <rtellason at blazenet.net>:
> > On Tuesday 16 November 2004 12:26 pm, TIm Daugard wrote:
> > > 5.5V means I could use my huge stock pile of TTL chips!
> >
> > You too,  eh?  I have a fair pile of that stuff too,  and it's 7400
> > series,
> >
> > not just the later 74LS00 series.  I'll figure out something to do with
> > them one of these days!  :-)

> Well, be sure to let me know when you do find a use for them, I have
> literally *thousands* of 7400 and 74LS00 series chips laying around here!

I have a fair  bunch of them too.  At least I don't have that much 
74H00-series stuff!

I'm looking at some circuits,  basically one that will take step/dir inputs 
and provide outputs to drive a stepper motor and I'm thinking that these will 
probably require maybe 2-3 chips,  a 7486 exclusive-OR gate and maybe a 7474 
FF or something like that (it's been a while since I looked at the 
schematic).  For something iike this,  I'll use the old parts.  Got plenty 
enough 7805 regulators that I can give each circuit its own if I want,  or 
just use one for all 3 (4?) axes,  supporting that whole board,  as long as I 
can stay below what the input side of that part will handle (35V?),  I should 
be okay.

Maybe a few other "toys" of that sort -- I once just for the heck of it 
breadboarded a 555 driving a dual FF which then used a 7400 to decode 4 
distinct states and sequence 4 LEDs.  Again,  for  the small number of chips 
involved it ain't worth going for the 74LS stuff...