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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
simple 8 step sequecer for SL
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PHOBoS



Joined: Jan 14, 2010
Posts: 4069
Location: Moon Base
Audio files: 602

PostPosted: Wed Jan 25, 2017 5:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Are you powering the CD4016's from the same 5V as well ?
Since you are using an arduino you could also do a simple test to see what happens when you turn all the 4016 switches off.

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benuron



Joined: Nov 22, 2009
Posts: 11
Location: Portugal

PostPosted: Thu Jan 26, 2017 11:57 am    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
Are you powering the CD4016's from the same 5V as well ?
Since you are using an arduino you could also do a simple test to see what happens when you turn all the 4016 switches off.


Seems like I was using 10K potentiometers, switched for 100K and seems like everything is working and it should Very Happy
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lagunitas



Joined: Jan 25, 2018
Posts: 1
Location: us

PostPosted: Thu Jan 25, 2018 5:48 pm    Post subject: Another Troubled Sequencer
Subject description: ...it worked on the breadboard....
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Howdy Gents!
I've been visiting this site for years and this forum has been a favorite. Its been said that the 4017 sequencer circuit is a rite of passage. Now that I've hit a bit of a snag in my sequencer build I pass another rite - asking for help on electro-music!

Please see attached, a basic 8-stepper with a 555 driving the 4017. The pulse from the 4017 goes through a 100k linear pot and then through a red LED with a 1.8V drop (instead of a 1N914 or other diode). In this way the LED gives a visual representation of the relative voltage passing through. I adjust voltage into the 4017 with a 317 so after the LED I have a 0-5V CV. This pulse is then level shifted by an opamp to a +/- 5V to work with other things...

I could swear this worked on the breadboard but now that it is all wired up on perf I get unsatisfactory behavior. Basically my nice linear pot acts like an anti-log pot so that in the first 5 degrees of rotation I have rapid voltage change and after that it flattens out. The level shift circuit behaves accordingly.

I've tried everything (?) to debug it! if I bypass the LED with a jumper the pot behaves the same way. If I run the 4017 off +9V the pot behaves the same way. If I place different value resistors in parallel with the pot, the pot behaves the same way. And when I say pot I mean all the pots, they all act anti-log.

I know the pots are regular linear - easy to measure! Just can't figure out how this pot change is happening! Does anyone have a clue?

Thanks in advance!!


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