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<DIV><FONT face=Arial size=2>Jim,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Don't suppose you've taken a look at this lately?
Just curious. Thanks for the help!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Brian</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>Will try and find some time within the next week to do that for you
all.<BR>Will see if I can also calculate the R and C values for you too. This
is<BR>just a simple standard circuit out of my head. Used a lot. Can
be<BR>greatly improved if switch happens to be a SPDT momentary
toggle.<BR><BR>Later,<BR><BR>Jim.<BR><BR>At 8-10-03 22:03, you
wrote:<BR>><I>*boggle*<BR></I>><I><BR></I>><I>Hey Jim, could you draw
up a schematic of this and upload it to the<BR></I>><I>website? Us
slower types could use the help. :)<BR></I>><I><BR></I>><I>Great
post!<BR></I>><I><BR></I>><I>g.<BR></I>><I><BR></I>><I><BR></I>><I>On
Wed, 8 Oct 2003, Jim Sturcbecher wrote:<BR></I>><I><BR></I>><I> >
Recipe as follows:<BR></I>><I> ><BR></I>><I> > 1 - Connect one side
of the switch to ground.<BR></I>><I> ><BR></I>><I> > 2 - Add a
pullup resistor to VCC on the other switch contact. this<BR></I>><I>
> gives you a normally high output that
goes to ground when the<BR></I>><I> >
button is pushed.<BR></I>><I> ><BR></I>><I> > 3 - Feed this signal
via a RC network (series resistor, then cap to gnd)<BR></I>><I>
> to lose the switch-bounce
noise.<BR></I>><I> ><BR></I>><I> > 4 - This then goes into a 74LS14
Schmitt trigger invertor.<BR></I>><I> ><BR></I>><I> > 5 - You will
now have a nice clean high-going signal out of the invertor<BR></I>><I>
> when you push the button.<BR></I>><I>
><BR></I>><I> > 6 - Feed this to the clock input of a D-Type flip-flop
(74LS74) which has<BR></I>><I> > the /Q
output connected back to the D input and both /SET and /CLR<BR></I>><I>
> connected to VCC.<BR></I>><I>
><BR></I>><I> > 7 - Now every time you press the button, the Q output
of the flip-flop<BR></I>><I> > will<BR></I>><I>
> change state.<BR></I>><I>
><BR></I>><I> > Voila, one change-over switch from a single
push-button. You can drive<BR></I>><I> > the leds from the Q output
through a transistor to take the current.<BR></I>><I> ><BR></I>><I>
> Serve and enjoy.<BR></I>><I> ><BR></I>><I> >
Jim.<BR></I>><I> ><BR></I>><I> > At 8-10-03 18:57, you
wrote:<BR></I>><I> > Quick
question:<BR></I>><I> ><BR></I>><I>
> I need to make a momentary pushbutton
switch turn some LEDs<BR></I>><I> > on
and off. I.E. you push the button once, they turn on, you<BR></I>><I>
> push it again, they turn off. Any
ideas?<BR></I>><I> ><BR></I>><I>
> Brian<BR></I>><I>
><BR></I>><I> > PS - I've been
having trouble lately with my messages coming<BR></I>><I>
> back from simpits-tech as undeliverable
my first try. Anyone<BR></I>><I> >
else having this?<BR></I></DIV></BODY></HTML>