I built this too. THOMAS OBERHEIM INVENTED THE RING MODULATOR FOR HIS COLLEGE THESIS 😊+🎅=🎍 The greatest tool in the experimental musician's tool box...the MAESTRO RING MODULATOR 's CV IN (control voltage in) is mind blowing! You can enter new realms of sonic bliss by the signal coming into the CV INPUT controlling the rhythmic behavior of the source feeding the ring modulator. I built all but two projects in the Craig Anderton Electronic Projects For Musicians book (the cheesy amp and the chromatic tuning scale), but the 25 I did build I etched my own pc boards and for Christmas my dad built me the 19" vertical circuit card panal rack. So I transferred all of the projects from the blue plastic Radio Shack boxes to the vertical rack panels. The Phase Shifter's VIBRATO SWITCH 'ON' with very slow rate sounds amazing! Another good Anderton project is the CLARIFIER. From an early 1980's Guitar Player Magazine article. Schematic online.

Did you keep the original bipolar supply, or get around it with more modern bits (and because you're good at this kind of thing)?

Yes i made it so it works with a normal +9volt adapter. The rest of the parts are similar to the original.

@Estebansindinero yes before 0:30 there is a delay mixed in. After that i have the delay after the ring mod using the sampling feature. If you want more details you can email me mtl.asm@gmail.com

@ 3:28 INTRUDER ALERT! INTRUDER ALERT!