Archive of the former Yahoo!Groups mailing list: MOTM

Larry wrote:

I have it on a freq. meter right now. Of course, it is designed to not
oscillate at very low frequencies to emulate the 904A (as I
understand it having never owned or even seen a 904A). So, I am
starting with 220Hz. I am increasing the input in even one volt
intervals:
220 Hz
438 Hz
889 Hz
1804 Hz
3591 Hz

Obviously, VCO tracking would be:
220
440
880
1760
and 3520

∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗

Very interesting. Thanks for the detailed info, as I have been
curious.

I just stuck a frequency counter on my Synthesizers.com Q150 ladder
LPF after reading your reply. The results were:

220
440
882
1755
3456

Like your filter, this one can be tweaked (though not internally) for
greater accuracy in particular ranges. It does have a nice sweet
sine. Interesting to compare.

johnm