digitech pds 8000 delay time pot

[shoegazed]

hello,

after reading through some posts about increasing the delay time and allowing the pedal to self oscillate, i gave it a shot and it worked well.

but i noticed a couple of things:

when the trimpot was adjusted to allow for maximum delay time, the delay time pot didn't do anything.
so i adjusted it back to where the pot is working again (changing the time and pitch) but noticed that the taper of the pot has changed quite a bit. originally the pot would have the biggest change from about zero to around 1-2:00. then from there until it was all the way up there would be a slight change. now the biggest time change happens from zero to 11:00, so i was wondering if there was a different pot i could try (maybe linear?) to make it more even all the way. i believe the pot in there now is a 100k W taper, which, i'm not sure what that is.

thanks, any help is greatly appreciated,

andy

[bwanasonic]

Yikes! Thanks for the warning! I have thought about tweaking the trimpots in mine, but A) I didn't know which one controlled delay time, and B) I was afraid I wouldn't be able to easily return the pedal to original specs. I guess I wouldn't be so worried about the taper per se, as much as losing the current ratio of 2:1, where the two extremes are an octave apart. I rely on using the delay time knob as a double/ half-time control in performance. On mine, the extremes are an octave apart, and around 11 oclock is pretty close to a tritone, but the 7-11 sweep is the most sensitive. As you might have guessed, I use my PDS 8000 exclusively as looper. Since the feedback knob is key to the overdub function, I was loathe to *break* that as well. Maybe I will get another one to experiment with, but for now I am having too much fun with the combination of Line 6 Echo Park, and *stock* PDS 8000. If the 2:1 ratio is maintained, I would be interested in tweaking the delay time, if there is not much audio quality sacrificed. I spent a night recently watching Bill Frisell slap his PDS 8000 around, and it was quite a revelation.

Kerry M

[shoegazed]

after i wrote that i went back and "retuned" mine so the delay time was two octaves apart, like it originally was. i use mine for loops too, (and we share the same influence), and i might recommend adjusting the trimpot that "could" make it self oscillate, (the one sort of in the middle toward the top of the pedal facing down,... the one next to it on it's side controls the pitch).

it's kind of nice to have the repeats stay a little bit stronger for longer, not oscillating, just a touch stronger, for looping.

i sometimes think having a switch or a delay time pot with a detent in the middle would be cool to get right to an octave up without fumbling about, though i've gotten it down ok after a few years with this thing.

[Gripp]

Hello
Another PDS-8000 thread, great!
I haven't messed with the trimpots for the same reasons Kerry hasn't but I have made the opamp switch (changed the TL072's and TL062´s to OPA2604's) and it worked out ok. Not a really big difference for me but I think that my PDS isn't being 100% alright after all.
I have bleedthrough of the loop in bypass mode, not much but if I postprocess the loop with a little compression or distortion it is annoying. It also is hissy/tinny at feedback levels required to make some good overdubbing. I know that it has a lofi sound and I really like this aspect but this hiss/tinnyness doesn't sound completely ok to me. And yes, it is run from a good clean psu.
Now for the embarrassing and good news. Remember that I asked for a schematic? Well, it turns out that I found it on a not so organized (what is when it comes to me) hard drive on my old computer. So if any of you guys want one, I could mail it to you.
This thread has inspired me, I migth even try tweaking the trimpots this weekend
Have a nice weekend all!
/Pelle

[bwanasonic]

OK, silly me! Yes the sweep is two octaves. If I loop something with the delay pot fully clockwise, at 12 oclock it's up a fourth. One octave is around 10:30, and then the next octave is covered between there and fully clockwise (about 6:30).

Kerry M

[Stevo]

OFF TOPIC but cant you change a PDS-2000 sampler to have 8 seconds of delay.. I heard it is the same pedal but tweaked different??   I dont have a scheme or the proper technique to try this unless it is not possible, but if is does someone have the info??

[shoegazed]

i have one of those as well, i'll take a look at it and see if it's any different.

[krellmusician]

I'd be interested in a copy of the schematic.  I have an 8000 and a 2000, and they are the same pedal except (if I recall correctly) for the memory chip and associated addressing.

[Gripp]

Pm sent to krellmusician.
Best!
/Pelle