Atari Punk Console + 4 step Baby sequencer

aseawolf · Joined: Dec 21, 2011 Posts: 7 Location: Madrid

HI . I made an atari punk console with a 556 IC and I had in mind to
connect it to a 4 step sequencer, using a IC 4017 and a NE555. I found
schemes on the internet but it does not seem to work. Someone is able to
give me some advice on how to link the 2 circuits?
[img] http://www.jameco.com/Jameco/PressRoom/Recipe3Fig1.jpg [/img]
[img] http://www.scottmetoyer.com/images/CHASER1.GIF [/img]
[img] http://note.monoanimal.com/images/apccircuit_2.jpg [/img]

. The result that I want is + or - this
[url] http://www.youtube.com/watch?v=hM3bqh_ReYQ [/url]
and a useful link to build the sequencer is this [img] http://www.midiwall.com/gear/babyseq/ [/img] but is not clear to me the 556's pin to connect the CV OUT(of the last image) ... I read somewhere pin 11- or 2 but do not seem to work Confused

. Thanks

inlifeindeath · Joined: Apr 02, 2010 Posts: 286 Location: Albuquerque, NM

the control pin on the 556 is where the CV goes, so pins 3 and 11. wire each 4017 output through a pot, and then sum the output voltages and send to the CV pins. You should check out HexInvertor's Simple Seq project on the forum here.
You can also look up datasheets very easily.

aseawolf · Joined: Dec 21, 2011 Posts: 7 Location: Madrid

So the pins are the control ones 3 & 11 .Shoud i put diodes 1N4148 as in the image [img] http://note.monoanimal.com/images/apccircuit_2.jpg [/img].Would you like to give me a link for:"HexInvertor's Simple Seq project"I can't find it .Thanks

umschmitt · Posted: Wed Dec 21, 2011 12:26 pm Post subject:

Hello & welcome ! You'll find it here :
http://electro-music.com/forum/topic-49287.html
(ok his name's HexInverter…)

aseawolf · Joined: Dec 21, 2011 Posts: 7 Location: Madrid

Thanks

umschmitt · Posted: Wed Dec 21, 2011 1:31 pm Post subject:

De nada. As explained on the sketch you provided, you should connect the output of the sequencer to pin 2 of the 556 (for pitch control) - and/or pin 12 (for pulse width control, whatever it could lead to, hopefully fun). On the APC I built, I let the control pins unconnected.
And yes, you need to use diodes as shown, to make each step's tension independent from the others'…

aseawolf · Joined: Dec 21, 2011 Posts: 7 Location: Madrid

Gracias.So pin 2 for pitch pin 12 for pulse and control pin disconnected

aseawolf · Joined: Dec 21, 2011 Posts: 7 Location: Madrid

Should I connect the potentiometers in this way?

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umschmitt · Posted: Sun Dec 25, 2011 12:30 pm Post subject:

Concerning pots and diodes, it looks fine to me. Your LED resistors seem way too huge to let them glow. I'd say they should be in the zone around 4k7-10K if you run it from 9 volts (babyseq schem says 18k !) but it depends greatly of the actual LEDs you use !
(and don't forget to try the seq output on pin 12 on the 556 for octave madness !)

aseawolf · Joined: Dec 21, 2011 Posts: 7 Location: Madrid

Don't care about the leds I'm not using it with those resistors.Anyway I've connected pots and diodes using that layout and I've connected all to pin 2 of the 556 (as I wrote in the image)and it isn't working.It doesn't change pitch Sad

.Now i will try with pin 12.

umschmitt · Posted: Sun Dec 25, 2011 1:53 pm Post subject:

Did I really write pin 2 ? Oh my ! Sincere apologizes ! Err I meant err… pin 1. My mistake. I was actually doing mental gymnastics between the 556, my double 555 circuit and respective datasheets… (and at one point I followed monoanimal's drawing)
So pin 1. I'm far from a genius with those electronic things, but I'll stay connected here for a while tonight, so if you're working on your APC please post your results & questions, if I can help without mistakes, who knows…
(yeah and just one resistor between all LEDs' cathodes and ground is Ok, but first get it to work !)

aseawolf · Joined: Dec 21, 2011 Posts: 7 Location: Madrid

OK OK It is pin 1 Smile

thanks I was so sad it wasn't working. On pin 12 it works greatly on pulse .Last question . Can i use the same pot for the two pins 12 and 1 or it won't work.Thanks

umschmitt · Posted: Sun Dec 25, 2011 2:30 pm Post subject:

Great news ! I'm glad it works ! Now let the fun begin !
So you mean feeding both inputs with the sequencer ? Just connecting things as is, I fear that there would be interaction between the two timers inside the 556. It's not like there is a risk of breaking something expensive here, so try it ! (and I don't think you'll break anything, to be honest) I'm curious to know what would be the result. Maybe a bit of chaos… Otherwise, with two diodes placed at the 1 & 12 inputs, it should work.
(further experiment : try to feed pin 4 (reset) with LOUD signal. Brutal hardsync here. But remember that reset at 0v means silence at output ! I think the APC works with that pin unconnected. Mine works, that is. Oh and you can apply the same to pin 10 of course !)