Build Your Own Clone Message Board

EDIT: Build Guide attached here:


Yeah, I'm on a roll with these PT2399 circuits. I recycle worse than a rich boutiquer!

Anyway, this one is the same core delay as both the Neptune and Tlaloc, but without modulation and an added tone control to roll off highs on the delay line (repeats). Even though there isn't any on-board modulation, I added some pads that are connected to the delay pot so that anyone can add their own modulation sub-circuit if desired.

Pots are set up for board-mounting (and they are all the same value!). The tone control is set up for a trimmer. For me, it's a "set once" kind of thing, but it could easily be wired up for a pot if you are a tweaker.

Here's a shot of the tested/verified layout. A finalized schematic will be posted soon. I still have a few values to adjust.

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Function f(x)
TightCamera - Gear Reviews

Damn, that's a tight layout, bro.

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+1
So...how long till I can get some.

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"Spud knows tone"

codtone.com

Thanks! It should fit fine in a 1290NS / 1590B or larger.

I also drew up another version without the tone control. But where's the fun in that?


About a month.

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Function f(x)
TightCamera - Gear Reviews

CJ, you should take all the different design you made so far and blend them all in the same layout.

So we'd get a delay, with tone, warp, modulation and some crap-fi taste.....

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Got the values updated. The Feedback is now a lot more useable over more of the pot sweep. Adjust R9 to taste for this.

I realize 68n is not all that common, but it works very well in the tone control. 82n would also work, as would 100n, but it might mean the darkest settings are unusably dark. For reference, this is C14.

I built mine with 15K for R5. It's a bit louder and brighter and 10K. Maybe too bright. Experiment!

Delay time seems to be about 500ms, maybe a little more. I will record a demo and measure the time in Audacity in the next couple days. Stock, it will do the "stuck in a metal tube" kind of reverb at the lowest Time setting, so if that's not your bag, you could jank up the value on R17 to extend the longer end of the delay time (at the expense of shorter times).

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Function f(x)
TightCamera - Gear Reviews

No.


But see, you can do that with this one. Just add it on with a small bit of perf. Or wait for me to come out with a PCB that is set up for a dual op amp and some spare pads!



That reminds me...I need to release the Eagle files for that one (or rather the reverby version). Thanks!

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Function f(x)
TightCamera - Gear Reviews

Yeah, something with a TL074 so we can feed multiple shizzle on it



That'd be nice for 1590A

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Here's the layout image. Not sure why I feel the need to post this, but I'm doing it anyway.

C22 could be a mm or two down from where it is, but other than that, everything fits really nice.

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Function f(x)
TightCamera - Gear Reviews

If you moved that cap a bit down and right, you'd have better luck fitting bigger electros... you know, for those of us with boxes of big electros hanging around
(I know it can't just be me!)

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I'll move it before I get any more made. That was the only thing that was a little too tight, which was surprising to me.

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Function f(x)
TightCamera - Gear Reviews

R9 is definitely better with 10K.

Also, 100n is not too much for the tone control cap.

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Function f(x)
TightCamera - Gear Reviews

Just did some quick-n-dirty "measurements" of the max delay time. I get just about 600ms every time. I'm betting this could be pushed up to 700ms by upping the value of R17 to 10K or maybe 15K. The tone control is able to dial out the nasty, but it's a pretty dark sounding delay line. Probably not for everybody, but if you are into the lo-fi analog thing, you'll probably dig it.

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Function f(x)
TightCamera - Gear Reviews

Yep.

With 10K at R17, it's about 700ms max. Minimum is about 150ms. There is a tiny bit of noise, but it's quite acceptable.

With 22K , it's about 800ms. Minimum is about 275ms. More noise, but still very reasonable for such a long delay time.


So, maybe the best thing to do is some parallel resistor trickery on the Time pot to maximize both minimum and maximum delay time.

Hmmm. With a 100K Time pot and a 270K resistor in parallel, that would make the pot's max resistance about 75K (which is close to our old 50K Time pot + the 22K minimum resistor at R17). And R17 could then be changed back to something small (like 2K2), and the range of delay times would (theoretically) be very short (less than 100ms) to very long (about 800ms).

Imma try that!

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Function f(x)
TightCamera - Gear Reviews

Oh hell yes.

Now we got about 60ms on the short end, and about 850ms on the long end. Still pretty good on noise as long as the Tone pot is full over. On settings less than about 300ms, the tone can be rolled back to get some brighter sounds.

Finally, math has paid off for me.




(not sure how the parallel resistor will interfere with any possible modulation, but sure it will have some affect)

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Function f(x)
TightCamera - Gear Reviews

I've updated a few values on the "stock" schematic. The filtering max is increased (darker), and the minimum delay time is a little shorter. As is, the range is about 60ms - 600ms.

The modulation pads can be used to add a resistor (270K) to parallel with a larger Time pot value (100K) for times up to about 800ms. Or the resistor could be added straight to the pins of the pot to leave the mod pads open for an LFO or whatever.

I'm calling this one done. For now.


Also, you could build the same basic thing with a Neptune PCB. I will work up a separate mod document for the Neptune that covers the extended delay times.

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Function f(x)
TightCamera - Gear Reviews

Here's a quick demo of the circuit:

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Function f(x)
TightCamera - Gear Reviews

Cool eff!

Damn I've missed out on some cool pt2339 boards. I'll jump on the next CJ masterpiece

Not really limited to this design, but a question, please:

Is there any reason you can't or shouldn't put something that's on a trimmer (like the tone in this example) on an externally-controlled pot?

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Not at all mrclean

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Other than a bias trimmer for BBD-based effects, I can't think of anything that would be bad to have as an external pot.

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Function f(x)
TightCamera - Gear Reviews

Who doesn't love getting told what they wanted to hear?!?!

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Little silkscreen error on the red TT pcb, R19 and R20 are labeled R26 and R27.

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Silkscreen mistake part 2:

C20 is labelled C22
C21 is labelled C24
C22 is labelled C25

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