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WIGGLING 'LITE' IN GUEST MODE

I got my used COTK C1680 VC Analog Delay today!
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Author I got my used COTK C1680 VC Analog Delay today!
JohnLRice
Now I just need to make it go, meanng I need to buld a +-15v to +-12v converter and adapt the wiring connection because I don't think I can stand to wait any longer and order COTK's own adapter board! hyper

parasitk
Pretty!

But please close your porn websites before taking pics in front of your computer, thanks! hihi
sandyb
looks nice john. what type of power connector does it use - looks a bit like a eurorack one from what i can see in the picture?

sandy
JohnLRice
parasitk wrote:
Pretty!

But please close your porn websites before taking pics in front of your computer, thanks! hihi


b bb but . . .I did! hmmm..... OH! I get what you mean! oops
JohnLRice
sandyb wrote:
looks nice john. what type of power connector does it use - looks a bit like a eurorack one from what i can see in the picture?

sandy


I haven't figured out yet what that type of connect is called but I'd like to know!

Here's a picture of the adapter board COTK sells:

sandyb
JohnLRice wrote:
sandyb wrote:
looks nice john. what type of power connector does it use - looks a bit like a eurorack one from what i can see in the picture?

sandy


I haven't figured out yet what that type of connect is called but I'd like to know!

Here's a picture of the adapter board COTK sells:



hmm - not sure. it looks very similar to euro but 14 pin rather than euro's 16. iirc they're called DIL sockets (i could be wrong though).
JohnLRice
sandyb wrote:

hmm - not sure. it looks very similar to euro but 14 pin rather than euro's 16. iirc they're called DIL sockets (i could be wrong though).


thanks, Sandy! That gives me somewhere to start from! Coffee Addiction FTW
krisp14u
that Looks like a very nice module you got there John (and that's one big ass Knob on there )
I hope you will give us some demos when its up and running
the connectors that Dopefer use are called

Double-Row IDC Cable Connector Sockets's
the ones I've used are quite cheep in the UK

http://www.rapidonline.com/Cables-Connectors/Connectors-Multipole/IDC- Connectors/Cable-mounting-socket/63686
paults
Take photos of the pc boards smile
Malekko
I wrote those guys a couple years back about what BBD's they use in this, they told me it didnt use BBD's....so, i wonder...if it actually IS an "analog delay"

Care to take some gut shot pics!?!
JohnLRice
krisp14u wrote:
that Looks like a very nice module you got there John (and that's one big ass Knob on there )
I hope you will give us some demos when its up and running
the connectors that Dopefer use are called

Double-Row IDC Cable Connector Sockets's
the ones I've used are quite cheep in the UK

http://www.rapidonline.com/Cables-Connectors/Connectors-Multipole/IDC- Connectors/Cable-mounting-socket/63686


Thanks for the info, Paul! Much appreciated!
JohnLRice
paults wrote:
Take photos of the pc boards smile


Okee, will do! 8) I've got it apart anyways because I'm trying to figure out where to hack in power since I don't want to wait to get the actual correct stuff and i want to hear this thing this weekend! hyper
JohnLRice
Malekko wrote:
I wrote those guys a couple years back about what BBD's they use in this, they told me it didnt use BBD's....so, i wonder...if it actually IS an "analog delay"

Care to take some gut shot pics!?!


It looks to be a digital delay that is designed to sound analog, from what I can see so far. (and not having heard it yet) If it sounds cool I'll be happy. Construction over all looks to be excellent with only about 4 obvious post assembly modifications (2 doubled up resistors and 2 trace cuts)

At its heart is a PT2395 which is a digital echo chip. There is also a CMOS 3D effect chip, a couple clock tunable lowpass filter chips, a THAT VCA and a bunch of other analog and digital support chips (memory, phase locked loop, opamps, etc) Over 15 chips.

So yeah, maybe should of been named the "C1680 Analogish Delay" but, if it sounds great I'll be thrilled! (if I don't kill it first trying to hack in the power! eek! )
JohnLRice
OK you thrill seekers, here be a shot of her innards! goatse.cx

wetterberg
*cough* digital delay *cough*

ahem.. the Princeton Tech chips do sound lovely, hehe.
Roycie Roller
How 'bout a shot of the Ensemble Generator's guts? I really wanna check 'er guts out! nuts
JohnLRice
wetterberg wrote:
*cough* digital delay *cough*

ahem.. the Princeton Tech chips do sound lovely, hehe.


Looks like Dave Brown played around with his own delay unit design based on this chip. (project abandoned though)
http://www.modularsynthesis.com/modules/DJB-echodelay/djb_echodelay.ht m
JohnLRice
Roycie Roller wrote:
How 'bout a shot of the Ensemble Generator's guts? I really wanna check 'er guts out! nuts


OK, if you are a good boy and clean up your room and finish your dinner I'll see if I can serve you up a C1670 gutz picture for dessert! hyper
JohnLRice
Hey, Paul S. or Paul D. or anyone, quick tip please.

I'm making a little voltage converter to power this C1680. I'll be taking the +-15v output from a Synthesizers.com wall-wart power supply and converting it to +-12v with 7812c and 7912c regulator chips.

I know that these can work without any external components but I usually see them with a small cap between the input and ground and one between the output and ground.

My question is, what value caps and in particular, what kind of caps? My initial thought was to just use what ever spare electrolytic caps I had around (47uF to 330uF or what ever) but I did a little research and it seems that the values suggested are a lot lower (like nF or pF) and possibly tantlum or ceramic?

I'm confused now and a little Chicken

help
Muff Wiggler
hey i'm the last person who you could call an analogue nazi, i have loads of digital modules in my rig and i don't really care as long as they get the job done

but isn't it a little bit crap that they call it a 'voltage controlled analog delay' when it's actually a digital delay? what's with that?

i just looked at the webpage and there's no mention at all of the fact that it's digital. "voltage controlled analog delay". However they do say "you won't believe it....."

i dunno. i betcha it sounds good though, and that's the important thing. Curious to know if the repeats degrade with longer delay times...
sandyb
Muff Wiggler wrote:
hey i'm the last person who you could call an analogue nazi, i have loads of digital modules in my rig and i don't really care as long as they get the job done

but isn't it a little bit crap that they call it a 'voltage controlled analog delay' when it's actually a digital delay? what's with that?

i just looked at the webpage and there's no mention at all of the fact that it's digital. "voltage controlled analog delay". However they do say "you won't believe it....."

i dunno. i betcha it sounds good though, and that's the important thing. Curious to know if the repeats degrade with longer delay times...


I agree!
krisp14u
I hate to criticize anyone who builds modular synths but I agree!
JohnLRice
JohnLRice wrote:
wetterberg wrote:
*cough* digital delay *cough*

ahem.. the Princeton Tech chips do sound lovely, hehe.


Looks like Dave Brown played around with his own delay unit design based on this chip. (project abandoned though)
http://www.modularsynthesis.com/modules/DJB-echodelay/djb_echodelay.ht m


Additional related info:

Ken Stone:
http://www.cgs.synth.net/modules/cgs44_ddb.html

Ryan Williams:
http://www.homebuilthardware.com/index.php/projects/pt239x-delay/
krisp14u
Hi John
Take a look at seb's synth page and his Bench PSU he takes the 12V and 9V from the 15V supply which is what you are wanting to do
Its not that I couldn't redraw a Schematic for you but this is much Easer
http://burnit.co.uk/sdiy/index.php?page=benchpsu&subpage=schematic
Malekko
WOW! I cant believe they use a PT chip and call it analog. I used to have a large 1/4 system that had a COTK frequency shifter in it..i got it from them and i was really happy. I emailed them about the "analog" delay and asked what BBD's they used (they didnt know i was a manufacturer that has a real live analog delay) His reply was we dont use them...because they are crap, i replied back saying then it cant be an analog delay then...their reply was something like this...
We use the same technology as a specific roland delay from the 70's...we wont tell you what one but be assured it IS analog.

I dont ever claim to know everything so i thought...well i'm sure it isnt an oilcan delay...not tape...so maybe theres something i dont know about.
But i've always wanted to know, i only knew one person with one of these and he wouldnt open it.

So "thank you" Mr Rice for putting my brain to rest...and for proving that they are big fat liars!

I'm not saying the delay doesnt/wont sound great, there are a TON of PT based pedals out there that sound fantastic...some of them even claim to be "analog". I was really happy with my COTK module when i had it too.
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