introducing the 'DREAMTIME DELAY'
Hi guys, i finished this up a while back, and never got round to posting .
2x pt2399 for longer, cleaner repeats, with modulation on/off for lush after chorus and warble, tone switch, true bypass..no tails.
i just wanted a good TB delay for my bench and board really.... :)
(https://s5.postimg.cc/h899bgofb/DREAMTIME_DELAY_PIC.png)
(https://s5.postimg.cc/8pzt7551z/DREAMTIME_PCB.png)
Quick question then DA.
So your running two pt2339s in series. Yet you have separate outputs summed with independent level controls mixed before IC3 b.
And this makes the delays longer how please?
I've never tried this.
Thanks for your time.
I'll go and listen to the demo
Thanks for sharing too.
Rich
The output of PT1 feeds the input of PT2. Both repeat times are controlled simultaneously and roughly the same via Q1, Q2 and the Time Pot. For example if PT1 has a delay of 150ms, it feeds PT2 this delayed signal, PT2 has the same 150ms delay so it's output is 300ms delayed from the dry signal. There is only one mixer level pot, I believe the other is a feedback pot. In theory, this will allow cleaner delayed signal because of the lower delay times of each chip, you may also be able to reduce the filtering on each PT since you are running them at lower delay times. My 2 cents anyway...
DA- great implementation. I built something similar a few years back but implemented pre and de emphasis so I could lower the filtering even more. Worked a treat and was a really nice sounding delay without all the artifacts the PT chips are known for.
hi rich, what lawrence said...the delay times are 'accumulated' to one big delay. ;D
same thing i did on the abductor but with 4 pt2399's 'accumulated'
all the other delays ive done have had tails, so i wanted to go TB with this one.
i love the modulation, nice n lush..very alex lifeson... 8) 8) 8)
another ace, rob!! well done!! gonna have to build one some day!! still waiting to get on the tremshifter lol
cheers jimi, you lazy bugger, you've had that for ages ;D
Wow that sounds sweet.
Such low parts count too.
Great work.
Thanks for that groovenut appreciate the explanation.
Rich
Sounds fantastic! Love the idea of running the pt2399 in series, definitely going to have to give this ago. That second Electric Druid Stomp LFO just found it's new home...
Thanks for posting!
Really nice work, Rob! Thanks for posting it - been wanting to play with PT2399s for a while, this might push me over the edge and motivate me enough to get going!
That was awesome! Perfect timing as well. I just started looking for a delay to build. The search is over.
cool.
anyone having issues with my site link?..like flash player stuff?. just curious as i updated it last year to
be compatible with mobiles etc...
https://deadastronaut.wixsite.com/effects
Wasn't working for me last night, something about updating flash but it seems to be working fine today...
cheers patrick....nice one. 8)
This is so beautiful <3
Working for me on iOS, Mac & pc
Lovely Rob, what's the maximum usable delay time?
hi kev, not sure, prob around 800-900ms...ish.
check at 10:20.
Ordered a board to keep the others company in my 'to do' pile. Really must order a bunch of box caps....
Cheers kev. i.ll get that off to you in the morning ok.
No hurry Rob, I'm away for a while
Yeah I got to have one. Thanks for sharing. Any suggestions on taper for repeats and mix?
linear 10k's....
note the 1mA's for speed /depth are wired backwards...(just work a lot better)
8)
Yeah I perused the schematic a little. Looks like a great build. The demo video is very nice too BTW.
And yeah I couldn't get the embedded videos on your site to play, but YouTube always works.
-Brett
Got it. Thanks Rob
blimey that was quick.. 8)
I thought you must have just let go as you passed over on your last orbit :)
DA does it do the crazy self oscilation thing when you fully crank the repeats? (looks like it almost does from the video) I'm looking at building something like the dreamtime but with a momentary switch to go into self oscillating. Thanks!
Hi chris. Sure anythings possible .
A momentary switch across the repeats pot may do it.....or across a resistor. I.ll give it a go later... 8)
Quoteintroducing the 'DREAMTIME DELAY'
There's beautiful lush sounds in there. Really cool.
i draw a layout for 1590B-ish perf, so tight!
why Rob circuit (almost always) hard to single sided onboard pots :icon_evil:
time to buy lumberg jack ;D
(https://1.bp.blogspot.com/-Ls_V-Hf1CSs/WuLflfYyWpI/AAAAAAAAAwo/AkNpurOQf0wN-4Eb53eIgji7Pt-M9kn_gCLcBGAs/s1600/wet%2Bdream.png)
I was just poking around with your schematic.
Is C29 (47n) supposed to go on the other side of R24 (2k2)?
For cascade delays, it might be possible to remove the input filter from the second delay since you already have a filter on the output of the previous delay chip. (Saves a few parts an makes the layout less cramped.)
Quote from: 287m on April 27, 2018, 04:34:14 AM
i draw a layout for 1590B-ish perf, so tight!
why Rob circuit (almost always) hard to single sided onboard pots :icon_evil:
time to buy lumberg jack ;D
(https://1.bp.blogspot.com/-Ls_V-Hf1CSs/WuLflfYyWpI/AAAAAAAAAwo/AkNpurOQf0wN-4Eb53eIgji7Pt-M9kn_gCLcBGAs/s1600/wet%2Bdream.png)
wow. nice layout, you want to do all mine from now on?
Quote from: deadastronaut on April 23, 2018, 03:50:05 PM
linear 10k's....
note the 1mA's for speed /depth are wired backwards...(just work a lot better)
8)
Dumb question... could I then wire C1M's the opposite way for the same taper but having a CW turn increase depth and decrease speed ?
Hey all just built this. Sounds great. Really good quality board too!
BetterOffShred I built my with 1MC pots and wired them backwards for CW turn to increase depth and speed.
DA The cap I'm using for the darker repeats is way bigger than you intended (30n). As a result the number of repeats is much lower (as well as volume) even when the rate knob is fully cranked. What resistor will i need to lower to make this happen? (i realise this will push the delay into self oscilation quicker on the hi setting).
Thanks.
hi glad you got it working ok....get rid of that 30n...that is wayyyyyyyyy too large,
surprised you hear any delay at all....larger the darker, smaller the brighter.
Had another listen, yeah that cap was a bit of an over shoot. Settled on 15n for the dark setting. Thanks again for the design. I built mine with a 4pdt that switches between two different mix, repeat and time settings. Couldn't be happier.
cool, yeah its a great delay....love the chorus/modulation too.. 8)
the Delay ist up and Running on my Bench :-)
many Thanks for your great work deadastronaut.
here are my Changes so far:
R for LFO LED = 4k7
max Delay time is 1 sek / 17MHz Clock ( I limited 50k Poti with parallel Resistor to 40k)
min f-Clock is 1.4 MHz - following Datasheet 2x40ms (80ms)
great worm sounding standard all you need Delay - sure will find a Place on my Board :icon_mrgreen:
longest (usable) Delaytime on my Unit:
(https://s15.postimg.cc/81berzofb/New_File0.png) (https://postimg.cc/image/81berzofb/)
excellent, glad its up n running, nice work man. 8)
i have mine on my bench all the time for when i'm testing stuff, great all rounder. 8) 8) 8)
i'll have to build another one i think....can never have too many delays... :icon_mrgreen:
Can't believe that I've had this board for nearly 2 years and have only just built it.
It sounds sooo good! Not boxed yet, swapped the lfo spdt for a dpdt so I can turn the 'eyes' off at the same time. Had to replace the other switch as well just to get them to line up so am wondering what I can utilise the extra pole for.
Another nice one Rob
Quote from: stallik on February 01, 2020, 04:44:13 PM
Can’t believe that I’ve had this board for nearly 2 years and have only just built it.
It sounds sooo good! Not boxed yet, swapped the lfo spdt for a dpdt so I can turn the ‘eyes’ off at the same time. Had to replace the other switch as well just to get them to line up so am wondering what I can utilise the extra pole for.
Another nice one Rob
You're not the only one! I have a board for more than 7 months, and just have populated it :) Hope I will test it tomorrow.
Which reminds me to ask: how to orient the pots, because pot pins are not marked on PCB :(
You lazy buggers.....yeah its cool, I built 2, one for the floor and another that's permanently on my bench...
Rankot,, pots, 321 left to right.
But I wire the 1mA 's reversed....
So you actually planned pots to be from the opposite side of other parts, right?
Yes I run the wires under the board, the toggles hold the PCB in place which are also under the board.
Boxed it. Led eyes switch off when lfo is disabled
(https://www.stallibrass.com/images/kas/Dreamtime.jpg)
Cool, looks very slick.... 8)
Nice modulation lush after chorus isn't it.....I love that sound... 8)
Hi
I am a bit of a newbie and would love to make the Dreamtime my next build but I can't figure out how the two LEDs of the "eyes" are connected to the PCB since I only see one place to connect the LFO LED. Am I supposed to connect both to the same place on the PCB?
Hi, yes, put 2 leds in parallel, connect to the 1 led spot. 8)
Hi
I actually never managed to get the Delay to work. I am trying now to get it to work and one of the things I did was to use a PCB to wire the switch. I am just not sure where I need to connect the TOFS cable to. The PCB I am using is this one https://www.musikding.de/3PDTconnectorpcb.
I would appreciate any help.
Thanks a lot!
EDIT: I actually figured out that I could use the PCB and just connect the cable to the lug hole of the footswitch in any case so that's what I did.
I still don't manage to get the pedal working though. I tested continuity and components abd all was good but when I turn the pedal on nothing happens (no LEDs and no sound). Could it be that I am using the wrong resistors for the LEDs? They are 3mm regular green ones.
the green leds will have nothing to do with it not working.
the tofs means to footswitch.
wire it up as per a standard 3pdt switch....i cant vouch for the 3pdt board you are using.
a basic pcb wiring guide is on my site.
https://deadastronaut.wixsite.com/effects/copy-of-mega-16-midi-drums
ignore the midi drums label on the link, it will take you to the pcb wiring for the dreamtime ok.