m-a-r-i-n Posted January 8, 2007 Report Share Posted January 8, 2007 I need help to solve this problem, i need create circuit to detect cross 2 sine wave voltage. Any sugestion is welcome! Quote Link to comment Share on other sites More sharing options...
AN920 Posted January 8, 2007 Report Share Posted January 8, 2007 Will the phase shift always be the same or variable? Quote Link to comment Share on other sites More sharing options...
m-a-r-i-n Posted January 8, 2007 Author Report Share Posted January 8, 2007 Phase is variable,amplitude is constant. Circuit need detect cross two sine wave and show that value of voltage. Quote Link to comment Share on other sites More sharing options...
AN920 Posted January 9, 2007 Report Share Posted January 9, 2007 Are the waves separate like on 2 inputs or combined at some point? Quote Link to comment Share on other sites More sharing options...
saiello Posted January 9, 2007 Report Share Posted January 9, 2007 Couldn't you use a comparator that takes both inputs. When the output is zero, the signals are at the same voltage, i.e. 'crossed', then all you have to do is to take a reading from one of the inputs for the actual value. Quote Link to comment Share on other sites More sharing options...
m-a-r-i-n Posted January 15, 2007 Author Report Share Posted January 15, 2007 Tanks to sugestion...there is final circuit: Quote Link to comment Share on other sites More sharing options...
aniruddha Posted January 20, 2007 Report Share Posted January 20, 2007 Hi m-a-r-i-n,I agree with zeppelin, why so complicated. ???As far as the working is concerned, in the top line, 1st comparator is used to detect the crossing, the schmitt is to eliminate noise-chatter, 2nd comparator acts as a plain inverter to nagate the effect of "inverting scmitt trigger", and the 3rd comparator is just a vtg. follower acting as a buffer. Atleast thats what i've analysed ;)But the whats the purpose of that 4th comparator sitting at the bottom???I think its quite unnecessary and makes the circuit complicated.But surely u must have had some reason to use it. Care2justify? :-\ Quote Link to comment Share on other sites More sharing options...
AN920 Posted January 22, 2007 Report Share Posted January 22, 2007 Looks possible to do with only 1 comp and 1 opamp Quote Link to comment Share on other sites More sharing options...
m-a-r-i-n Posted January 23, 2007 Author Report Share Posted January 23, 2007 Well this is how i create the circuit in blocks....comparator compare two sin wave voltage, when output is 0, the comparator activate digital circuit to activate pump capacitor on the level of voltage from one voltagesources. Then the output is equal cross voltage....this is short explanation Quote Link to comment Share on other sites More sharing options...
m-a-r-i-n Posted January 23, 2007 Author Report Share Posted January 23, 2007 The basic circuit is sample and hold circuits,the simple sample and hold circuit is this: Quote Link to comment Share on other sites More sharing options...
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