Triton Delay - Adding the "Glide" from EchoCzar to PT2399 [documentation]

[culturejam]

Did this one a while back but thought I'd share here. I took the basic bones of the Deep Blue Delay (changed some filtering values), added a variable LPF on the delay output (via trimmer/cap), added a second Delay Time control with a slow transition when switching between Time 1 and Time 2. It works similar to some versions of the Toneczar EchoCzar how it does the "glide" between Time pots. Probably more of a curiosity than something you'd actually use all the time, but it's fun to play around with.

I just updated a few values on the drawing today based on the last one I built (which I think is the best sounding one I've done). I've also attached photos of a build I completed (and one I'm about to box up).

If you want to monkey with making the transition time (and resulting pitch-bend glissando effect) longer, make C20 larger.

Any questions, feel free to ask!

[rockola]

Sounds like a hot ticket. I'm currently trying to learn how to use KiCAD and redrew the schematic for practice. See attachment, hope I didn't make too many errors. Going to try making a PCB layout next.

If it's OK with you I'll put the KiCAD files on Github. When I started looking into KiCAD I noticed there are very few editable schems out there (same goes for Eagle). Having something to play around with would probably make the learning curve less steep. With that in mind, how would you like to be credited? Your schem just says "@function_fx"...

I also have a question: would it be OK to move R17 before the switch (or between the LEDs and ground) and omit R18 altogether?

triton-delay.pdf

(60.77 KiB) Downloaded 243 times

[culturejam]

If it's OK with you I'll put the KiCAD files on Github.

This project is 100% free/open source, so do as you want with it.

With that in mind, how would you like to be credited? Your schem just says "@function_fx"...

You can use "culturejam / @function_fx" if you like.

I also have a question: would it be OK to move R17 before the switch (or between the LEDs and ground) and omit R18 altogether?

R17 / R18 + D1 / D2 are only there as indicators to show witch Time pot is active. You don't need them at all if you don't care about that. If you do drop them, then you only need a SPDT switch for the Time pots, instead of DPDT as drawn.

[rockola]

With that in mind, how would you like to be credited? Your schem just says "@function_fx"...

You can use "culturejam / @funciton_fx" if you like.

Will do, cheers.

R17 / R18 + D1 / D2 are only there as indicators to show witch Time pot is active. You don't need them at all if you don't care about that. If you do drop them, then you only need a SPDT switch for the Time pots, instead of DPDT as drawn.

But if I do care and want the two LEDs, won't I still be able to get away with just one resistor, since the two LEDs are not on simultaneously?

[culturejam]

But if I do care and want the two LEDs, won't I still be able to get away with just one resistor, since the two LEDs are not on simultaneously?

Oh, yes. I misunderstood your question. You are correct.

[rockola]

I've uploaded my files on Github, see https://github.com/rockola/triton-delay

The files include a schematic in KiCAD format & PDF and a PCB layout in KiCAD format & Gerbers.

Unless someone spots a glaring error, I'll bite the bullet and put an order through Oshpark.

Board front:


Back:


Copper layers:

[culturejam]

Unless someone spots a glaring error, I'll bite the bullet and put an order through Oshpark.

I'm a big fan of OshPark, but have you ordered through JLC PCB? The quality is quite good and it's insanely cheap (even with expedited shipping it's cheaper than OshPark).

[Dr Tony Balls]

Very cool! Ages ago I implemented something like a ramp control on a Leslie type effect, and I think this is similar. I'm not fully sure what that was, though. I have some notes that kinda look like a GEOFEX LERA but its a different circuit....not sure what it could be from.

[rockola]

Unless someone spots a glaring error, I'll bite the bullet and put an order through Oshpark.

I'm a big fan of OshPark, but have you ordered through JLC PCB? The quality is quite good and it's insanely cheap (even with expedited shipping it's cheaper than OshPark).

Good call. I ordered PCBs of m-kresol's Rubidium Reverb (for which he has graciously released the Gerbers) from JLCPCB a while ago and was quite happy with the quality. Looks like they'll still do 5 boards for $2, which is of course hard to beat. I think I'll whip up a few more layouts to save on shipping.

[rockola]

Got the boards today. So far so good.

[soulsonic]

triton2.jpg

You painted and labeled before drilling?

[culturejam]

triton2.jpg

You painted and labeled before drilling?

Yep! The purple one is UV printed. The other one I laser etched. It’s easier to etch or print first. At least for me.

[soulsonic]

I gave up doing that after too many boxes getting scratched

[Seiche]

so how does it actually work? On the echoczar this "slide" is using the effect that the PLL is locking onto the voltage going into pin 9 and adjusting its clock frequency, why does it work here?

[plush]

so how does it actually work? On the echoczar this "slide" is using the effect that the PLL is locking onto the voltage going into pin 9 and adjusting its clock frequency, why does it work here?

I beleive, It works due to C20 providing kinda smooth transition (charge/discharge) between VCO clock adjustment (pin 6) when you are swapping resistances (potentiometers).

[Dr Tony Balls]

so how does it actually work? On the echoczar this "slide" is using the effect that the PLL is locking onto the voltage going into pin 9 and adjusting its clock frequency, why does it work here?

I beleive, It works due to C20 providing kinda smooth transition (charge/discharge) between VCO clock adjustment (pin 6) when you are swapping resistances (potentiometers).

That's definitely how the Geofex circuit works:

[culturejam]

Yep. Basically it just uses the R/C filter as a "bleed off" of current from pin 6. The time it takes to switch from one to the other is a function of the frequency of the R/C filter.

[Jarno]

Got the boards today. So far so good.

Did you build these already, and are they OK?
Seems like an interesting project, not just for guitar/bass but also for my modular synth. There are a couple of CV controlled PT2399 projects out there, and usually the gnarly edges of the range is what makes this interesting (maybe harder to do in a stompbox).
The Hordijk Zeitgeist and NLC Delay No More take this to the next level
Nonlinearcircuits has more, REALLY WILD, stuff, also PT2399 based
https://www.nonlinearcircuits.com/modul ... ay-no-more

[rockola]

Did you build these already, and are they OK?

Got distracted so no, the PCB is not verified yet. Thanks for the reminder, I really should dig up the board and finish it.

[cspar]

I can confirm that the boards Rockola has shared work.

The one I built is on the noisy side, but I have almost all the wiring offboard in a 1590bb and my pt2399 is from a low tier on the supply chain.