Feedback resistor in analog delay

[gutsofgold]

Trying to get more repeats from my Arion SAD-1 delay so it will quickly enter that freak out/oscillation mode.

http://www.diyguitarist.com/Images/ArionSAD-1.gif

That 27k (might be 2.7k hard to read) resistor coming off the wiper of the Repeats pot would be it correct? And your essentially allowing a set amount of your delayed signal to be fedback into the delay circuit with that Repeats pot (along with 27k and 0.47u combination)? Is it that simple?

I'm only hesitant to start soldering and experimenting right away because I bought this pedal from a guys who gear room was flooded in a hurricane and just wanted to get rid of most of his stuff. The pedal works but the PCB feels like cardboard and I'd like to give it as little abuse as possible.

[PRR]

Man, I hate the 571.

OK, it looks like if the BBD and filters were unity-gain, and 571 resistors were nominal 20K, the 27K value would give 3dB droop per repeat. With real values, maybe 4dB. This is a fine value if you do not want the box to make rude LOUD noises. Makes sense.

> that freak out/oscillation mode

So you -want- rude LOUD noises? Change 27K to 20K, plus or minus some fudge for component tolerance and loss. If you "go too far", you can always turn-down. So perhaps 18K.

> the PCB feels like cardboard

Then gently tack a 56K or 47K across the existing 27K. That avoids dealing with the PCB pads, gets you into the right area, and is easily un-doable.