Hi Ed, Have a look in "The Art of Electronics" by Horrowitz & Hill (if you don't hav a copy, you should! or try the local libary). It has a nice circuit for this (Actually a telescope drive IIRC) type of application. Robert G8RPI.
________________________________ From: Ed Mersich <wa6...@comcast.net> To: time-nuts@febo.com Sent: Sunday, 1 April 2012, 23:18 Subject: [time-nuts] 60Hz More or Less My Heathkit, and other AC clocks have been broken for months now. I started a project to figure out how bad it was. It's getting interesting as I am approaching my goal of coding a software emulation of an AC line clock. During the process I developed a couple of web pages to help me understand the problem better. Frequency meter: http://wa6rzw.homelinux.net/addon/grid/gauge/hertz.html Grid history graph: http://wa6rzw.homelinux.net/addon/grid/graph/wgraph_1.html The meter requires a real HTML5 browser, anything but MSIE. When I started this my goal was to provide an external reference source to the Heathkit CG-1005, so that it will keep correct time. Since I began I have considered a number of hardware solutions to correct or modify the Heathkit. I think I am dragging my feet because there are no replacement clock chips (in case of disaster,) to be found for this model. At the moment I am thinking about modifying a DC-AC inverter and syncing it to an audio oscillator, (don't laugh, my Heathkit 30 year old audio generator is way better, more stable, than the grid). 73, Ed - WA6RZW _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.