Hey guys......

I'm new on allaboutcircuits.I need help on my new projects from you guys.
I've a 3 channel RF remote control system.I remade it from my motorcycle alarm system.I found a point on the circuit which can deliver 3 types of trigger pulses.The problem is dat the three types of pulses came from one line (multiplexed/encoded).I need to make a circuit that can convert this one line to three seperate(Demultiplex/decode)

It gives,
A Monopulse on pressing Lock button on the remote.
A 2-Monopulses on pressing unlock button.
A continous high state for 10sec on pressing siren button.

The attached first figure shows the pulse schematics.The second figure shows the required circuit for me(as logicaly schematised)
Please help.......

 

hi fameseth
one of the clearest submissions ive seen in a long time,
im a bit new, we have a lot of different time zones so it can take a short while for the experts to answer your query ,

in the meantime consider the 4017, each output goes high in turn -
one pulse--- output 1 goes high
two pulses--- output 2 goes high and so on

 

ps
reset to off after each command, say after 5 seconds.

the ten second pulse is a problem, ideally if it could be split into 3 somehow,
a time constant and/or maybe the 555 could do this

(5/6 second time constant triggers more than two pulses from a 555?-just a thought-)

 

Thanks for ur reply tibbles...
Actualy thats wat i want.I want the single line to split into three line.
Well Can u guide me with this 4017 pinlayouts and truthtables or something if u dont mind?
It will be a great help.
thanks pal...

 

hi again
just google 4017 (or its equivilent) plenty of info there.
basically the clock advances the count and reset resets to zero

this is just one approach, its similar to a digital proportional decoder,but
normally you would have more control over the input- sync pulse, frame length etc,where you would use each channel in turn to pass the logic level and length of pulse,

if i get chance will look again later, hopefully you will have had more knowledgable replies by then.