VK3YV wrote: > Hi, Tom and Bruce, many thanks for the help so far. Now I realise that I > will have to divide my 10MHZ reference down to match the 5MHZ from the > sulzers and also down to 1MHZ to use as an external ref. for the 5245L's. > How do I change the TTL from the dividers back to a Sine wave as both > activities will need Sine wave inputs. > I have no idea as to how to go about this, going the other way Sine to TTL > no problem but have never had to think about it. I am not an engineer just a > ham and the grey matter doesn't work all that well these days. Any > suggestions. > One more question to bruce what is 74LCX ? I have not come across that > before. > Regards Don....VK3YV. > > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > Don
From TTL/CMOS is very easy just low pass filter the square wave output of the divider see: http://www.wenzel.com/documents/waveform.html If you are concerned about using a non unity mark space ratio waveform, don't be it doesn't have to be that exact see: http://www.wenzel.com/pdffiles/choose.pdf 74LCX is just a variety of high speed CMOS (> 100MHz clock) that operates from a 3.3V supply, both its outputs and inputs will tolerate 5V logic signals. Bruce _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts