This morning, i've just remembered another weird frequency divider i say on a chronorecorder (a device used to adjust mechanical watches) a few years ago...
The frequency dividers stages (three or four, i'm not sure) were unijunction transistor based staircase generators using the charge pump/reservoir principle to divide the input frequency by an integer "N" factor. Interinstignly, the "N" factor was adjustable using a potentiometer. Again here, just as with the ring counter, no glitch problem here, as with the binary dividers, but the pot had to be carefully adjusted so it is in the middle of the correct "N" range, this way, the counter can resist aging. Interinstignly, since it uses the charge pump/reservoir principle instead of the well hnown gated monostable, this counter is relativey (within a reasonable measure) frequency independant. Again, just as the all-transistor ring counter, i do not have the schematic, but i know the owner of the chronorecorder, and next time i'll see him, i'll ask for a look inside the device to sketch a schematic. BTW, i do not know the jitter response of such a counter, but i can eassilly imagine that it is very poor (slow transitions), but since it smells analog, i like it!! ;-) 73 de Normand VE2UM Montreal, Qc, anada __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
