[sdiy] CMOS CD4046/4070 ring mod??

[Tony Allgood]

>>The Radio Shack MG-1 used the 4046 VCO as a high frequency oscillator
>>for a top-octave doo dah for its polyphonic output.

>Really??  I always wondered what that was.  So they are square outputs
>using a 4046 with a divider in the loop??

The 4046 is being used as a high frequency VCO only. There no PLL stuff
here... er, I think, I don't think its doing the Polymoog thang here.
Although David Luce was involved with both.

>That makes sense, although I do not think it is any different than any
other XOR gate, such as the quad XOR CD4070 already being discussed.

Yes, thats right. My point entirely. Its simply being used to perform
the ex-or function on the two square waves from the VCOs. Works quite
well really.

Shame about the colour scheme of the front panel though.

Regards,

Tony Allgood, Penrith, Cumbria, England

Oakley Modular Synth and TB3030:
www.oakleysound.com/projects.htm
My music: www.mp3.com/taklamakan