Tuesday, December 18, 2018
Dimension P Chorus
Had a request for this one and didn't feel like laying out another overdrive. So here you go. It's a chorus using a pair of PT2399 design to emulate the Boss Dimension C designed by Distorque. Original design thread here, schematic here for reference. I've laid it out for board mounted pots and will fit in a 125B with top mounted jacks.
Thank you as soon as the results are ready,great Layout. :-)
ReplyDeleteHello,
ReplyDeleteI have a request for interesting fuzz - Parasit Studio Theremin Fuzz
Here's build doc:
https://www.parasitstudio.se/uploads/2/4/4/9/2449159/theremin_fuzz_doc.pdf
For what it's worth, I built the stripboard layout from Parasitstudio's website and got ticking & noise on two separate builds.
ReplyDeleteThere's a few suggestions from a user in Parasit's comment section. One suggestion was to provide each PT2399 with it's own LM7805 regulator.
Once I gave each PT2399 it's own regulator, the ticks went away, and it was much quieter!
Good luck!
Can you do the layout for this interesting chorus ?
ReplyDeletehttps://drive.google.com/drive/folders/0BwEUmCA5sw1bQ0doTG9RT3RfTFk
Sounds amazing! it uses a pt2399, one ne5532 and 5 BC547
I think is one of the deepest chorus just for one pt2399 Nice regards
This comment has been removed by the author.
ReplyDeleteHappy Hollydays! Could you, please, make a layout for that stereo mod? And maybe the double 7805's(one for each PT) I want to try to make this one.I wanted a ping pong delay and this might do the trick for me.
ReplyDeleteIt's verified. I have added another 7805 according to the above comment.
ReplyDeleteI have a question. I don"t see at schem, that 5v from LM7805 go to 5 lug tl 072. Why is it go here?
ReplyDeleteSchematic is linked above in the description. I'm guessing the designer used 5v instead of creating a separate 4.5v Vref.
DeleteYes, i got it. Thanks. Doing!
Deleteverified too. I have added another 7805 too. It"s such chorus for kids.
ReplyDeleteHi, could you please teach me how to add another 7805? Where did you put it?
DeleteGOOD NIGHT. WHICH THE TOGGLE KEY USED IN MODIFICATION AND HOW TO CONNECT THE CIRCUIT TO THE SAME?
ReplyDeleteTHANKFUL.
It's working but I got a lot of high pitched noise. Tried swapping PT2399s to no effect. The only thing I noticed is a big signal drop of the 470k resistors. The high pitched noise is amplified along with the severely attenuated input signal, causing the whole high pitch issue. Any thoughts? Thank you!
ReplyDeleteI had a similar problem in another build and I found that I had a "ground loop" using both ground lugs on both (in and out) stereo female jacks. Also, there might be a short somewhere near the 2399, as I had that too. Check theese and take it from there.
ReplyDeletePoderia fazer o Layout desse pedal aqui?! https://www.youtube.com/watch?v=iQ1y8gikPqQ e desse?!
ReplyDeletehttps://www.youtube.com/watch?v=N_vp2igXBmY&t=228s
And where the "voice" and "dry" selectors would be placed. Thanks for the help guys.
ReplyDeleteExcellent sound in the video, I would like to know where to place the connections for spdt
ReplyDeleteShouldn't the 270R resistor of the second PT2399 be 100R?
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteIt sounds great but it needs some mods.
ReplyDeleteEven if
i got my pts from china!
Its verified! Works great wt minor hassle but anyways its awesome! Jun fr Philippines
ReplyDeleteThe schematic link isn’t working any longer. Do you still have the schematic?
ReplyDeleteHi, I built this pedal and everything works, but I get a slight overdrive in the sound. I tried to reduce the input sound level to the chorus, but overdrive still happens. I also tried to replace the operating seat, and that didn't fix my choir either. Can you advise me where to look for the problem and how to fix it?
ReplyDeleteHi,
ReplyDeleteI just built the PCB version, slightly modified for two regulators as indicated by some. The circuit works, however I get a sort of periodic thump that follows the rate pot.
I'm not sure if this is the "clicking" that some described... more of a low frequency thump, sort of like a heartbeat. Turning up the rate pot accelerates the "heartbeat".
I'm testing this without an enclosure along with 3PDT switching, although I plan to enclose it.
Has anyone else encountered this "thumping"?
Any indication that this is noise-related and could go away with an enclosure?
Any thoughts/ideas?
I have a bunch of PT2399 I could try swapping...
Thanks in advance!
I've been tracing the PCB and comparing to the original schematic and I've noticed something.
DeleteIn the original Distorque schematics, the regulators input is taken straight from the 9V supply, whereas here, the regulator input is taken AFTER the 100R resistor.
There may be something else wrong with my wiring, but the voltage for me after the 100R resistor is merely 5.35V, which is way below the 7V needed by the 7805... I'm only getting a bit more that 3V from the regulators... not good.
Was the change in the regulator input intentional?
Anyone who built this can confirm the voltage after the 100R resistor?
Just trying to see what the problem might be here...
Thanks in advance!
Sorry for spamming, just wanted to leave my solution here in case it helps anyone from the Googlenets...
DeleteI removed the PT2399s and measured everything again, the regulators got enough voltage. Connecting just one PT2399 back in, already dropped the regulator voltage below normal values.
So after much double-checking and triple-checking, I decided to scratch the regulator input PCB strip and connect it straight to the 9V supply... Volia!!! no thumps, no clicks, no noise, just clean chorus baby!
@Effects Layouts, you might want to revisit the diagrams. I guess the current drawn from the PT2399s is large enough so that the voltage drop in the 100R resistor is significant. If you take the regulators input from this point, it's going to be around 5.3V, just not enough.
Anyway, I can provide the modified PCB layout for two regulators (needs one more jumper) and the power hack (needs another big ass jumper :) ) if anyone is interested.
Keep on rockin' !!!
Holy crap, that's my video! Been browsing the site, downloading and sorting all the layouts. Can't wait to try some of them. Keep up the amazing work!
ReplyDeleteHi all! Firstly, I built this pedal including the mods with the two switches. It sounds great, but I did end up having to make a few changes.
ReplyDeleteOne thing I saw mentioned before is the voltage towards the regulator. I am using an LM7805 and noticed that if I run the 9 Volt supply to the regulator after the first 100 Ohm resistor, the voltage drop is so significant I am left with only about 5,5 Volts going into the regulator (which is not enough for it to regulate it to 5 Volts). Therefore I have connected the 9V to the regulator's input directly, and that works like a charm!
Secondly there is a flaw in this PCB that I have only seen one (unanswered) comment about. In all the schematics I have been able to find of this pedal, the resistor on pin 6 of the PT2399s is 270 Ohm on the first (left) one, and 100 Ohm on the second (right) one. In this PCB layout there are 2 270 Ohm resistors. I have yet to swap it out, so it may not make a huge difference, but my guess is that it'll make the pedal sound even more chorus-y as those resistors determine the delay time of the chips, and the difference in delay times should give a slightly more warbly effect due to phase differences.
Something I have yet to experiment with is something I have read about on several forums, which is swapping the 5 Volt regulator with something like an LM317 adjustable regulator. I have seen instances where people mentioned that increasing the Vcc to 6 Volts (or even 6,5 Volts, but I think that may cause significant risk to the chip) of the PT2399s resulted in an even lower delay time (and therefore more chorus-y chorus). Using an LM317 to adjust the supply voltage thereby enables a sort of "Intensity" setting. At least theoretically.
I will report back when I have some results!