D.M.N.
New member
I've seen a few older circuits that originally utilized hard to source BBDs updated to use MN3007s (Lectric FX Karaoke, Flintlock, Electric Mistresses). I'm interested in building an update of the DOD 690 Chorus, which used the SAD512 (also the R5106, which are still findable though not cheap), and was wondering if anyone has some resources that might shine a light on how I could go about updating it to use either a MN3007 or other modern chip. Here's the 690's schematic:
