2399 triple splashback delay

nervous_squirrel · 2020-05-23T19:22:52.609Z

Keith Emerson had a frequency counter on his Moog to check everything was definitely in tune before launching into a solo…

lookmumnocomputer · 2020-05-24T21:10:03.100Z

RIGHT!!! ok here we go! spent the last couple of hours working out the best way to do this. so I think the best is a switch where you can bypass The dry signal completely from the module. everything else works, its just completely wet. and also slightly louder (you lose a gain stage, which could be good for some! as I know it can be a faff to get the raunchiest sound with very hot signals)

so snip the TOP leg of R27. and to bypass wire a wire from the resistor to the positive leg of C31.

this in essence taps off the first delay before the mix knob, but doesn’t effect the feedback as it still goes back into itself, it just listens to the first delay in a different step in its circuit.
(check the picture, ignore the yellow jumper that was from a previous attempt that didn’t work)

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now if you want to add a switch, it’ll be easy for you squirrel mc squirrely cus your using your own panels but for people who want to do the mod on the Kosmo panel, there’s a gap you can squeeze a Single pole dual throw (SPDT) mini toggle switch. be sure to get the hole in the right place (I did it by eye but was quite lucky!!!) you solder the wires like

MIDDLE LEG OF SWITCH TO SNIPPED TOP LEG OF R27.
then first leg of switch to POSITIVE LEG OF C31
then 3rd leg of switch to the pad that R27 used to be connected to.

you can swap which leg 1sr and 3rd is which depending if you want the switch to be fully wet engage or fully wet disable!

good luck! I hope that helps

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nervous_squirrel · 2020-05-24T21:13:52.250Z

Amazing, thanks so much for this, hugely appreciated!
Best wishes,
Squirrel McSquirrelly.

lookmumnocomputer · 2020-05-24T21:29:22.485Z

let me know how it goes! the delay is surprisingly much longer than I thought when its completely wet and playing into it!!! by the way have you made the 5u panel yet perchance? I may ask kindly to purchase a copy! try and shoe horn it into my club of the knobs 15!!! if that’s cool man.

lookmumnocomputer · 2020-05-24T21:30:04.870Z

one more pic for reference

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lookmumnocomputer · 2020-05-24T21:32:17.072Z

the way its setup it may be hard to add a mix knob into the splashback. big mumma’s on its way tho haha

nervous_squirrel · 2020-05-24T21:34:18.977Z

Sure, will let you know how it goes - I’m working on it the wiring this evening, looking forward to making the adjustment you’ve recommended. I’ve made a prototype 5U panel (plain aluminium), and will make the ‘proper one’ once everything’s finalised. Would be very happy to make one for you - will send a photo once the first one’s done…

nervous_squirrel · 2020-05-24T22:49:20.653Z

Yes! Totally works! It’s really nice to be able to remove the dry signal when it’s crunching away in ‘garbage mode’, so thanks very much for that.

Could do with just one more switch to make the panel symmetrical! Always just one more switch…

analogoutput · 2020-05-24T22:50:57.276Z

Just put the switch in now and you can figure out what it’s for later

lookmumnocomputer · 2020-05-25T08:11:30.116Z

good! ok had a think of the other switch! control invert for the last 2 delays. ill figure out where you need to put it later. itll basically make the control go backwards from the main delay. but I don’t know how useful it will be I have an idea of how it could be done easy with a couple of snips of resistors. will check later!!! maybe dont commit to a nice label yet haha

nervous_squirrel · 2020-05-25T08:16:40.421Z

Okay, that sounds fantastic, will reserve that switch space! Had thought it could maybe reintroduce the forbidden C22, but your idea sounds much better.

nervous_squirrel · 2020-05-25T08:21:06.652Z

I have just enough room for a 4PDT if it takes more than two resistors…

lookmumnocomputer · 2020-05-25T14:58:55.113Z

A VIDEO OF THE FULL WET MODIFICATION

lookmumnocomputer · 2020-05-25T15:03:56.064Z

it shouldn’t take more than a single pole. the plan is (I haven’t tried yet, not sure when! but give it a gooo)

so my thinking is if you snip the potentiometer leg thats connected to DLY2B1 that will disconnect the cv inputs of the second and third delay from the first delay.

Then to invert the voltage going to them so they react inversely to delay 1, wire a wire from that leg on the pot to pin 8 of the Tl074. then if you want to make a switch I guess make it so you can select between that and normal. no idea how it will work usefully.

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nervous_squirrel · 2020-05-25T15:24:17.321Z

Cool, will try this…

nervous_squirrel · 2020-05-25T20:21:19.468Z

Voltage from pin 8 is inverted, but has to be at a higher range to work I think?

lookmumnocomputer · 2020-05-25T20:34:04.421Z

aaah shucks yeah I just realised, yeah thats not going to work at all. sorry. its gunna be complicated to get this circuit to do it inversely, will need to make an offset to offset it up. will need another opamp to make it happen on this one!

nervous_squirrel · 2020-05-25T20:37:00.614Z

No worries, it’s not essential! Thanks for your help anyway, and let me know when you’ve finished the big one!

ChristianBloch · 2020-05-25T22:42:30.294Z

Thanks, @lookmumnocomputer! I so love that you took the time to figure this out and even made a video! With lots of gratuitous noise to boot .

lookmumnocomputer · 2020-05-25T22:44:18.719Z

hahaha yes! well may as well :D. it was on the to do list to figure out a full wet mode for another project. so what better time to do it! it opens up more possibilities, for instance if you make fully wet, you can chain them to make infinitely long delay time for instance. which is a feature im working into a module its getting pretty outlandish. not gunna be a small one!!!