A chorus circuit like that is based around a BBD chip and a clock generator.? In this case, MN3204 is the BBD and MN3102 provides the clock.? There also one or two fixed filters, made with op amps or transistors.
It seems the MN3207 + MN3102 combination is more common, which was used in the original Boss CE-1 design, but they used transistors for the rest of the circuit, which makes it harder to follow:
I found a page with the combination you have, but the example schematic has been spoiled by photobucket.? If you save the image, or use View Imager in Firefox, you can see it without their banner, but you have to squint to make much out:
Maybe you can see a more detailed version if you register and log in.? The datasheets for the chips should have example circuits too.
- Andy
AndyHornBlower