I recently ordered a couple of CD2024 dividers from Jameco, but got Motorola MC2024’s instead. Last time they sent me Motorola substitutions, it didn’t matter- but this time, the chip is entirely different: a dual VCO, as opposed to a divider. Turns out these might be useful, so I won’t bother sending them back, but I do plan to point it out to them.
This chip is designed to operate at radio frequencies (MHz), and a chart in the datasheet shows that the noise performance gets worse as you go lower in frequency. However, I didn’t let that stop me from having a go at it on the breadboard. Although it’s not perfect (the noise/distortion gets noticeably worse as you go into low frequencies), it is fun to play with.
Below is the circuit I came up with for using it as an audio-frequency oscillator. Note that the datasheet recommends +5V operation, so I also put that in the schematic- however, the version I built on breadboard uses +9V, and it seems to work. That is to say, it doesn’t seem to overheat or anything like that. Also note that the function of SW1 is to switch between CV modulation of the 2nd osc along with the first one (thus making it like a unison osc if using a dual-ganged pot, which I represented in the schenatic as VR2a & VR2b), or modulation of the 2nd osc from the first (thus making it a pseudo-FM osc).

Here are some recordings of my tests- the first one shows the oscs in “unison” mode, with CV modulation from a Schmitt trigger LFO:
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The next one shows the oscs in “FM” mode, with osc 1 being modulated from the same LFO:
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The third and last one is a combination of both modes, with the modulation source’s rate also being tweaked, often going into audio rates:
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