problem getting gates AND CV from 4017

[loss1234]

i have been trying to build a mini sequencer of sorts of based on the Baby 10 and a few other 4017 designs, but basically they all work in the same manner. However, here is the problem. I can only get the gate to trigger my Envelope on the start of each new cycle (so on a 4 step pattern, the gate only fires on the 1, not the 2, 3, and 4)

i am using a diode from each step, tied together into a jack for the gate out. for the cv, i am using a pot off of each step, with all the steps once again tied with diodes at the end to a jack. the cv works fine.

thanks

[Joel]

I had a look at building one a while ago, I think the problem is these tend to have "gate" out not "trigger" - ie. for each step, the gate output is high for the whole step. As the gap between steps is essentially nothing (except where the sequence loops back to the beginning), the gate output is constantly high so you only get one triggering event. Have a look around for a gate to trigger converter, think one was mentioned recently....

[RF]

I've used this with 4017 seq's...

http://www.cgs.synth.net/modules/cgs24_gatetotrigger.html

Good Luck!

Bruce

[fonik]

we would need a gate2trigger converter for each step before we mix the gates/triggers, don't we?

[Joel]

I was wondering, could you just tap off the 555 timer (presuming that is what is driving the sequencer) - as this goes hi-lo for each step of the sequence?

[fonik]

sure, but using the input trigger won't enable you to switch on/off triggers for each step.

[Clack]

you need to use a gate to trig for every step

econimically , you can use a 40106 (or any inverter or nand ) to create a trigger from a gate for each step, as bugbrand told me in a lunetta thread:-

[richardc64]

[loss1234]

thanks!

so if the gates out arent really very useful, i wonder what Mark verbos was triggering with them. in other words, fonik-your version has 2 gate outs. were you ever sucessful getting it to work as a gate source? is it possible that the gate out would work for "something"?

[fonik]

[Clack]

i think the baby 10 is a bit minimal , i think the advantage to it is you can have odd rhythems because the gates merge. you need to have switches to be able to turn off each step

(this?)

looks like it has an output jack per step and thats how it is done there. a gate to trigger per step shouldnt be to hard to implement if you want it

[fonik]

yes. and i have a lot of fun out of it!

[loss1234]

so i think what everyone is saying is this: the baby 10's gates merge, which means, unless i install some switches, i will always get a long gate?

thanks

[fonik]

exactly. and as soon as you turn on two consecutive switches their gates will merge.

[RF]

If I recall correctly, I used AND logic with the clock signal and the Gate from the 4017.

Sorry I don't have all the details on it - I recall I had to wrestle with it for a while til I got it to work.

bruce

[richardc64]

[fonik]

very elegant. i will have to implement this to my baby10. a very valuable upgrade.

[loss1234]

richard thanks

it was mentioned earlier in the thread but NOT with that nice schematic!!



i will try this after work

[loss1234]

sorry for my ignorance but in that schematic are those tiny triangles backwards inverters or a switch?

(coming from the outs of the 4017)

[blue hell]

[richardc64]

[loss1234]

richard, i am going to build your mod today and i noticed that you have a cap going between the two triangles (gate length section)

any hints on cap size?

thanks

[loss1234]

oops...sorry, i see a low value cap in the earlier reply.

[richardc64]

[widdly]

What about 20 steps from a single 4017?

I think it would work. Needs a dual-gang pot though and the clock needs to be 50% duty cycle.