DS 7 clone

[loss1234]

ok i want to know where i can input a GATE in from a miniature 4040 sequencer i made. i am assuming gate is either on or off, not stepped like cv??? i dont know i f my sequencer puts out cv or gate...but i think i have a schematic for making a gate seq.

BUT WHERE DOES GATE GO ON THE DS7??
can you stick a gate in into the trigger in??
or is there a mod i can build to convert gate to trigger?

and is pulse the same as trigger?

so confusing.


is there a website somewhere that explains the details of cv/gate/pulse and how they all work?


thanks alot


the ds7 would be awesome if controllable from a sequencer

[Uncle Krunkus]

A gate goes high while a key is being pressed on a keyboard. So you control the length of a gate by the way you play.
A trigger may be produced by a keyboard, or it could be produced by a sequencer, etc. It has a preset length, usually in the 10->40mS ballpark. You can modify equipment to change the length of the triggers, but it's not something you can control in real time like a gate.
CVs are variable voltages which are analogous to a setting, time constant, or input device (like a keyboard).

[loss1234]

so can you use a gate to control the ds7???

[julianw]

[bblloooodd]

Hi all,

I'm very new to this and I wanted to build a DS7 as a project to try and learn a bit more.
I have a question about the capacitors used in the circuit, specifically those rated 16v ('10uF/16v').

Is it importnat that these be 16v?
If so, why?

I have a feeling that this could be a really silly question.
If it is I apologise.


Iain

[blue hell]

[bblloooodd]

Ah ha

pretty simple then.
Thank you for the super speedy help.

Iain

[killer duck]

i´ve been building two DS7, but doesn´t work properly. I can hear a high signal from the VCO but i can´t control it. i replace C5 with 100n cap but anything happened. I would appreciate if someone can give me some info.
the pcb layout and schematics from bareille´s page should be alright, so i really don´t know..
thanks in advance

[bblloooodd]

Hellllo again,

I have another question about the capacitors used in this circuit
I guess some of them are electrolytic but does it matter whether they are polarised or non-polarised?

Thanks again for any help.

Iain

[killer duck]

Hi there, my DS7 sounds GREAT now, it was a wrong cap value. i started to build a DS8, but i had problems in the wiring connection:

J7, JO8 and J9 had been connected to a SPDT switch?
and J10 where?????

J16, 17 and 18 connected to a 50k pot? and this is the Mode control?

sorry, i´m really lost with it. but i feel enthusiastic with the project

[tajny]

Killer Duck- I am building DS-8 clone, and I've got the same questions as you.
-Where J10 must be connected?
-J7,J8,J9- there must be a switch? In DS-7 there is a 50k pot between J8 and J9. I don't get it. I think we must connect here a pot - like in DS-7.


I've found a DS-8 Manual, here is it:


And here is my DS-8 clone (as we can see- almost finished)

[popsicko]

So I've read through most of this thread. Didn't see too many sound examples. Is there a page or Youtube video of this thing?
It seems like it would be a good begginer project as I love elctro-percussion.
What are the main differences between the DS7 and DS8?
Can they be triggered from a drum pad?
Can a ring mod be added easily? With an on/off switch or some sort of mix knob?
Can they be triggered from a sequencer?
Has anyone built a simple gate sequencer to trigger them?
Ideally I'd like to have 4-6 of these in a box with a built in sequencer that syncs to MIDI from my computer. Am I living in a dream world?
I am brand new . . . again. I have to start from scratch. What are some absolute necessities? What is the cheapest way to build one of these? Breadboard? Too temporary! Stripboard? I've never used it but it seems easy.
Thanks!
-b

[LocustPlague]

So, I built a pair of DS-7s using the top two sections of dnny's 3 ds-7 layout...

However, I got some terrible behavior out of them. The top module constantly emitted sound. I could control the sound via the VCO, sweep and rate pots...using a signal tracer, I was able to determine that these signals were somehow bleeding into either the ground or +5V lines.

The bottom module didn't work at all. After some mucking around I got no change.

I built them using a lm13700, but I triple checked the connections before soldering. I'm going to try the layout in which the lm13700 fits in...but I don't know what might have gone wrong. I was wondering if anyone else had any ideas on this? I dismantled the board in preparations to make another...I'll let you know if that makes much of a difference.

Thanks.

[synthmonger]

Anyone else not seeing the DS8 pcb and parts layout pictures discointellect (sp?) posted? I had them saved on my old hdd but it crashed ;x

[Lemmy]

Yeah, a DS8 layout would be nice... Maybe Marc has requested that they be taken down from the site?
He doesn't seem publish the pcb layouts - just sells the pcbs themselves. Fair enough, they are his layouts.

[funkyfarm]

to summarize about modifications on Coron DS-7 :

Push button (momentary) to fire the unit

CV input vco (pot 100KA)

Audio input for VCA , example for noise (pot 100KA)

Deeper bass on VCO (SPDT switch)


do i miss something ?

[funkyfarm]

I find this to be strange.
If R2 is turned full ccw, then you put point A (3080 input) to ground.
If "nothing" in, nothing out...

Here, for audio input, I’ve wired a 100k potentiometer between external signal and ground, with its cursor to point A via a 100k R in series.

I've put 1uF instead of 3.3uF for Decay. (snap, snap, snap...)
I've put (via a switch) a 10nF cap for lfo rate (stock value is 47) for more FM-like mod.
I put two gate in (via passive mixer)
Add a CV in for FM mod (with SH-101 vco as input)

With SH-101 noise through Audio VCA IN :

[funkyfarm]

But as, all in all, I was not happy with decay pot (btw only got 1Ma instead of 2…) I’ve put a vactrol across it.

Only positive control works, it shorten the decay time.

Individual step outputs of the sequencer are mixed together to cut vca and give amination.

[computer at sea]

Hey guys,

I'm at a bit of a dead end with this project. I can get a tone from the input, and have control of the level and intensity, but nothing else. I've gone over the board a bunch of times and checked all my joints and connections- everything looks correct, also I substituted the capacitor that the schematic says is 1nf with a .1uf cap.
I'm using an NTE996, which my local parts store tells me is the equivalent of the CA3080. Could this be the issue?

[richardc64]

[computer at sea]

Thanks for your response! I switched those caps as per the suggestion of an earlier post that said the 1nf cap was an error in the schematic and should be 1uf.

[richardc64]

Bugger. Don't know how I missed that. I'd have to search through only 8 pages.

[Sprak]

With risk of repeating what others already have asked for; a DS8 PCB layout would be great.

[Ojd]

At last I made my dual Coron DS 7! I don't know where you take your piezo triggers (i'd certainly could use a dozen or two!), but i just don't know where to get them. Or its just here in Ukraine they are scarce.

I made it! Dual Coron sounds really cheasy, but not low enough for me (i guess i'll have to try "deeper bass" mod. Though it doesn't have inverted envelope (pouuk only, not kuuop), but i have Formanta UDS too, which have some of theese. I guess two of theese will made the most unconventional synth percussion ever heard (UDS osc makes tones from infrafrequency to ultrafrequency - its not a joke!). I guess i'll make some DS 8 too. To make total of 4 drum modules. But first i'll have to draw a layout. Maybe i don't have enough experience to do this, but I guess whole forum might prove usefull (you will help me wouldn't you?). Samples and photos SOON!

By the way, I think I know the secret of using 5v instead of 9v or 12v. When you use more volts, unit responses to velocity, but its not volume that being low when you hit lightly and hight when you hit hard, its osc jumping higher at higher velocities (a little louder too), but for electronic drums its better to stabilize the osc then to make it jump. so when you use 5v you get equal tone no matter of velocity. Its very usefull for tr909ish kicks (first variant is hard to get in electronic kits, because man is not a computer and each kick produces slightly different tone. For bass drums it is unacceptable).

P.S.: Anyway now i'm making some real casing (i don't like the casing you made, I mean most of the people in DIY don't know a thing about designs and stuff). Just look at PAIA stuff - that is really beautiful design, or Ray Wilson's MFOS (especially WSG) is very straight but completly rocking, or Polivoks synth (my favorite). Its not really hard to use paintbrush and paint for straight lines and 90 deg. angles or make decals like hip-hop graffiti writers do. Anyway i spent a few years of my life for a design and I really like well made composition of knobs, fonts and angular scales for knobs etc. etc. and I don't like ZVEX and alikes

[DETOX]

does anyone of you have a pcb layout of it online?
i'm too lazy to design my own....