joebloggs Posted October 28, 2006 Report Share Posted October 28, 2006 How can i reduce a 4mhz frequency to a 10hz freq? Quote Link to comment Share on other sites More sharing options...
Gazza Posted October 28, 2006 Report Share Posted October 28, 2006 How can i reduce a 4mhz frequency to a 10hz freq? In the power field we use a drive circuit. This means we rectify the signal, then using an inverter reconstruct the wave at the frequency that is desired.In a low power application I am not sure what the most efficient method would be. Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted October 29, 2006 Report Share Posted October 29, 2006 You could use a series of deviders. Quote Link to comment Share on other sites More sharing options...
mvs sarma Posted November 1, 2006 Report Share Posted November 1, 2006 Hisuch nice info (thanks Hotwaterwizard) i do recollect my training days.perhaps the clock being 4MHz, even CD40 series (CMOS)can work and with llower power consumption. ofcourse the proper pin outs shold be followed.sarma Quote Link to comment Share on other sites More sharing options...
Ughadoo Posted November 1, 2006 Report Share Posted November 1, 2006 How can i reduce a 4mhz frequency to a 10hz freq? You can also use a multi stage Ripple counter; every stage will divide the input frequency by 2 and so a 16 stage counter will output a frequency of 61.03515Some extra logic will be necessary to correct the output and to further divide to 10 Hz.CMOS Ripple counter datasheets:CD4020BC.pdf Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 1, 2006 Report Share Posted November 1, 2006 With a 5V supply, an ordinary Cmos counter is guaranteed to work with a clock frequency as high as only 1.5MHz. A 74HC counter works at much higher frequencies so use a 74HC90 to divide the 4MHz to 400kHz.Feed the 400kHz to two CD4518 dual divide-by-10 counters in series for an output of 40Hz. Then use a CD4013 dual flip-flop for exactly 10Hz.The total is 4 ICs. Quote Link to comment Share on other sites More sharing options...
MP Posted November 5, 2006 Report Share Posted November 5, 2006 Joe,If you have some experience with microcontrollers, you can do this pretty easily. Count the pulses coming in and send a pulse out another pin after every so many counts. As long as you use a micro with a faster clock than 4 Mhz, it will work fine. This is on the same lines as what hotwaterwizard, ughadoo and audioguru suggested but with less parts count. MP Quote Link to comment Share on other sites More sharing options...
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