When I go to build a pedal, I tend to concentrate on designs that use Analog electronics, and parts that are relatively easy to get, a lot of the old Chorus and Delay pedals from the 1970's used a type of technology called "Bucket Brigade", I won't go into too much detail about how it worked though, back then Bucket Brigade ICs used to be fairly inexpensive and readily available, nowadays they are very hard to get and expensive if you can find them, you can occasionally buy them on eBay but there have been lots of reports of counterfeit Bucket Brigade ICs being sold.
There is one IC that can be used to build a Chorus and Delay pedal and it's not hard to get, it's called a PT2399 IC and was originally designed for use in Theater Hi-Fi Surround Sound applications, I have a little chorus pedal that I built using a PT2399 IC, it's called a Little Angel Chorus, the problem with it is it sometimes doesn't power up correctly.
If you're interested in building a Compressor, Chorus or Delay pedal you can find details to build one on this website, note that you need to register as a member, registration is free though:
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