bobleny Posted November 25, 2006 Report Share Posted November 25, 2006 What would be the easiest and fastest way to produce this signal? Quote Link to comment Share on other sites More sharing options...
MP Posted November 25, 2006 Report Share Posted November 25, 2006 What is the amplitude? Does it only produce this one set of two square waves or does it repeat this sequence? If it repeats, does it give a defined number of repetitions or is it continuous?MP Quote Link to comment Share on other sites More sharing options...
bobleny Posted November 25, 2006 Author Report Share Posted November 25, 2006 The amplitude is unknown, it simply needs to click a small reed relay, I don't belive this will be a problem.It is a continues pulse, where it goes high for .5 seconds, low for 1 second, then high again for .5 seconds, then repeats every 4seconds.I should have said that in the first place! :-[ Quote Link to comment Share on other sites More sharing options...
MP Posted November 25, 2006 Report Share Posted November 25, 2006 If a 5 volt amplitude is desirable, you could use a clock circuit and some logic or clock circuit with 4017s where you choose the output pins that would give you the correct timing. For a more accurate source, you could use a microcontroller. Turn the port pin on, start a 500 millisecond count, turn it off, start a 1 second count, turn it on, start a 500 millisecond count, turn it off, start a 4 second count, and loop (repeat). Such a circuit would only require a cheap micro, a clean 5 volt source, and a resonator.MP Quote Link to comment Share on other sites More sharing options...
bobleny Posted November 25, 2006 Author Report Share Posted November 25, 2006 "clock circuit and some logic or clock circuit with 4017s"Could you expand a little bit on these two?Especially the 4017s. I am familluar with those and have access to many of them.I tried this circuit with 555 timers and got close, but it is so ridiculous! In fact, I had to take it apart and add 2 more times to it, then I probably would have needed another after that! I don't believe this circuit should require five 555 ICs!So, yes, please, expand.Thanks! Quote Link to comment Share on other sites More sharing options...
MP Posted November 25, 2006 Report Share Posted November 25, 2006 Have you made one of the blinky light projects with the 4017? If so, you know that the clock frequency causes each output to fire off in a controlled sequence. Thus, if your clock signal causes each of the LEDs to blink at every 0.5 seconds, you could select the pins you want for a pulse every 0.5 seconds, 1.0 seconds, 1.5 seconds, etc. Of course, you are not lighting LEDs, but are using the outputs for pulses, instead. For example, output pins 1 and 4 would probably give you a pattern like your timing diagram and you would need a 12th sequence to re-trigger the first again at the correct timing. To get a 12th sequence, you will have to cascade 2 4017s. You basically have a 0.5 second time base and you can choose which increments you want to use until it loops back and starts over again.MP Quote Link to comment Share on other sites More sharing options...
bobleny Posted November 25, 2006 Author Report Share Posted November 25, 2006 Thanks! :D This will work perfectly!Thanks again! Quote Link to comment Share on other sites More sharing options...
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