Here’s a cool delay designed by Nocentelli posted over on FSB. Here’s what he had to say about it over there:
Here’s a variation on the deep blue delay; two PT2399 chips and a current mirror delay pot give around 2200ms delay, although beyond 700ms gets pretty lo-fi. There are two points where a momentary SPST can be used: Either to briefly connect the input to the delay input on select phrases (dub mode), or to bypass the repeats feedback resistor for self-oscillation on demand.
Note: I’ve recently found out the capacitor going from Repeat 3 to Osc Sw2 is 22n.