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<DIV><FONT face=Arial size=2>Sounds perfect! Like Gene said, a schematic would
be awesome. :) But this definitely looks like it will do the trick.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>And for my next trick - fitting it all into an old
graphing calculator case! ;)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Brian</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=jimsturs@zonnet.nl href="mailto:jimsturs@zonnet.nl">Jim
Sturcbecher</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=simpits-tech@simpits.org
href="mailto:simpits-tech@simpits.org">Simulator Cockpit tech list</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, October 08, 2003 3:49
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [simpits-tech] Momentary
on-off</DIV>
<DIV><BR></DIV>Recipe as follows:<BR><BR>1 - Connect one side of the switch to
ground.<BR><BR>2 - Add a pullup resistor to VCC on the other switch
contact. this<BR> gives you a normally high
output that goes to ground when the<BR> button
is pushed.<BR><BR>3 - Feed this signal via a RC network (series resistor, then
cap to gnd)<BR> to lose the switch-bounce
noise.<BR><BR>4 - This then goes into a 74LS14 Schmitt trigger
invertor.<BR><BR>5 - You will now have a nice clean high-going signal out of
the invertor<BR> when you push the button.<BR><BR>6 -
Feed this to the clock input of a D-Type flip-flop (74LS74) which
has<BR> the /Q output connected back to the D input
and both /SET and /CLR<BR> connected to VCC.<BR><BR>7
- Now every time you press the button, the Q output of the flip-flop
will<BR> change state.<BR><BR>Voila, one change-over
switch from a single push-button. You can drive<BR>the leds from the Q output
through a transistor to take the current.<BR><BR>Serve and
enjoy.<BR><BR>Jim.<BR><BR>At 8-10-03 18:57, you wrote:<BR>
<BLOCKQUOTE class=cite cite="" type="cite"><FONT face=arial size=2>Quick
question:</FONT><BR> <BR><FONT face=arial size=2>I need to make a
momentary pushbutton switch turn some LEDs on and off. I.E. you push the
button once, they turn on, you push it again, they turn off. Any
ideas?</FONT><BR> <BR><FONT face=arial
size=2>Brian</FONT><BR> <BR><FONT face=arial size=2>PS - I've been
having trouble lately with my messages coming back from simpits-tech as
undeliverable my first try. Anyone else having
this?</FONT><BR>_______________________________________________<BR>Simpits-tech
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