On Sat, Aug 27, 2005 at 08:23:58PM +0200, Francois Robbertze wrote:
> I need to very simple and cheap circuit that will toggle a relay on and of
> on a pulse input.
> 
> i.e.: first pulse(e.g. a key pressed) will switch relay on
>     second pulse will switch the relay off again etc.
> 
> I can easily do this with a pic , but I need this to be simple..

What's simpler than a 12F629 programmed to do this activity? You're
going to need debouncing anyway. Otherwise, the bouncing of the
switch is going to cause the relay to pulse.

So you need to add debounced in front of pulse. So you'll need to
define the delay between pulses.

At the end of the day you're looking for a 555 in monostable mode for a
debounce circuit driving a flip-flop that's configured in toggle
configuration.  So each press of the button will activate the 555 and
clock the flip flop.

Or as I started out with: what's simpler than a 12F629 programmed to
do this activity?

BAJ
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