Ludwig Phase II Synthesiser

[Hozy31]

Ludwig_Phase_II_synth_diylc_v2.png

Ludwig_Phase_II_synth_cuts_n_linkers_diylc_v2.png

Ok this is layout is identical to the one posted by DIGI2T on DIYstompboxes.com. Since his vero was a slightly different shape I redid it in diylc v2 just before I started building it, so I have given him the credit. However, credit should also go to a few other people such as R.G. Keen, and others from DIYstomboxes forum for the work that went in to produce the clone.
I have had an attempt at adding the wiring for the switches but am sure I have some mistakes in there. If someone would kindly look over the schematic and advise me where I have gone wrong I would be eternally grateful. There may be some grounding issues as well. I have to admit to being a noob when it comes to reading schematics.
Schematic found here http://www.geofex.com/Article_Folders/Ludwig_P2/TotalLudwig-2nd_run.pdf
Since there are some standing resistors you may need to refer to the original vero as the values may be obscured by the pins.
Links below will get you to the various threads in DIYstomboxes.com for more info.
http://www.aronnelson.com/gallery/main.php/v/digi2t/veros/Ludwig+Phase+II/Ludwig+vero.jpg.html
http://www.diystompboxes.com/smfforum/index.php?topic=92125.0
http://www.diystompboxes.com/smfforum/index.php?topic=94478.msg823694#msg823694
http://www.diystompboxes.com/smfforum/index.php?topic=95132.0

I have this built but don’t really want to wire it up yet until I know for sure that the wiring is correct. Here’s a picture. I did make one error on my build with a misplaced cut and link but fortunately it didn’t alter anything, Phew! I wonder if you can spot it.



Message from Dino (DIGI2T). "More info for you. Where the transistors are concerned, make sure you match the gains of following groups of transistors;
- Q8, Q12, Q15, Q19
- Q9, Q11, Q16, Q18
- Q5, Q6
The first two sets are for the formants, and the last set is for the fuzz. Matching the gains helps ease tuning, and yields better YOY. Matching the fuzz transistors adds to the harmonic content." These are the transistors with white writing. The bottom 2N5551s need matching to each other as do the 2N5401s above. The two upper 2N5551 & 2N5401 also need matching to each other.

Go here for matching the above transistors. http://www.aronnelson.com/gallery/main.php/v/digi2t/veros/Ludwig+Phase+II/Ludwig+vero.jpg.html
 
Be careful to note that there are cuts under all the trimmers except the top 50k one. Those are not linkers under the trimmers but bent legs. Make sure the middle leg does not contact the copper row it is coming from except for the 50k as mentioned.

Note the DF04M has only 4 legs.

[notnews]

Hozy, amazing stuff. Thank you for taking the time to clean up D's layout. I really appreciate you taking the time to explain your logic a bit, I'm just starting to draw up my own layouts and being explained the nuts and bolts of a design really helps me understand at a deeper level.

Did you end up wiring and boxing this up? I'd love to hear some feedback about how it sounds and the outcome of any improvements you made..

Cheers =)

[Hozy31]

Hey notnews,
Still haven't wired it up yet. Still waiting for my final few bits from tayda and some machined piping from China to attach the wah pedal. Once built i will update the page with info on calibration etc. I have a PC oscilloscope which should help with that. Hopefully everything will be here by early next week. I am now almost sure the wiring is correct.

[Hozy31]

Ok, update on the build. Taken me a long time to get this far. Nearly finished the wiring check the pics out. This was a total bastard to wire up as you can imagine.





Still waiting for a bi-colour LED as i ordered ones with common anode not common cathode. only realised when i came to wire it up. Also need to convert a dud crybaby into the animation pedal.
Still not sure wether to include power supply in the box or if it will cause too much noise. I may leave it in just now and move it to its own enclosure later if its causing noise. The power supply is a power supply for car adaptions and can be found here http://www.amazon.co.uk/gp/product/B00HJLJFOK?psc=1&redirect=true&ref_=oh_aui_detailpage_o06_s00. I reckoned this would be perfect for this sort of project.

More updates soon.

[nocentelli]

dear god

[Hozy31]

Nearly got this up and running after eventually finding a decent power supply. The prevuious one i mentioned just wouldn't stabilise at 48v so had to bite the bullet and order a slightly more expensive power supply. Checked all voltages and everything seemsd to check out fine. However, i must have a mistake in my wiring as i get no bypass signal with the unit switched off and none when engaged.

It would be really cool if someone could check out my wiring. I know there is a mistake in there already as i came across it months ago when wiring up but forgot to change it. I know its a big ask but i can't see the problem with my limited schematic skills.

[tabbycat]

nocentelli wrote

dear god

i know. i'm kind of left speechless. i feel like john nash's wife in 'a beautiful mind' when she discovers his shed.
hozy, you are amazing. totally off the scale.

Hozy31 wrote

Nearly got this up and running after eventually finding a decent power supply. The prevuious one i mentioned just wouldn't stabilise at 48v so had to bite the bullet and order a slightly more expensive power supply. Checked all voltages and everything seemsd to check out fine. However, i must have a mistake in my wiring as i get no bypass signal with the unit switched off and none when engaged.

It would be really cool if someone could check out my wiring. I know there is a mistake in there already as i came across it months ago when wiring up but forgot to change it. I know its a big ask but i can't see the problem with my limited schematic skills.

i would definitely say contact dino himself (digi2t at diysb and fsb). he's a lovely chap and deeply into the science of stomps. he lived and breathed every single connection of this circuit for a good portion of his life, it became his 'palais idéal' (look up postman cheval). i think he would be impressed with how far you have got and he would like to see you complete it successfully as much as we all do. but he is by far the best one qualified to advise whereas, speaking for myself, i feel a bit like an ant trying to discuss quantum physics with zeus.

i wish you the very best of luck with this one.

[Hozy31]

Thanks tabbycat. I did contact dino a while ago but the guys insanely busy and i think he's put this one to bed. I am detrmined to get this up and running. At least i sort of know where to start debugging but everytime i think about it sorts of puts me off a bit. I will try and get it properly debugged soon as i want to get the Schuman two face fuzz a go and if all goes well the infinitephase.