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 Forum index » DIY Hardware and Software
CMOS 4017 Based 8 Step Sequencer
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wavejumper



Joined: Dec 08, 2018
Posts: 2
Location: sweden

PostPosted: Sat Dec 08, 2018 4:32 pm    Post subject: CMOS 4017 Based 8 Step Sequencer Reply with quote  Mark this post and the followings unread

Hello, first post, be kind!

So I've just started learning electronics and diy-synth-stuff. Have been messing around with 555 and APC and it's all working just fine. I would like to integrate an 8 step baby sequencer with functions like hold and step forward, some how Iv'e succeeded with the help of some of the common schemes floating arond the web, but I think it's very unstable and it does'nt feels like the correct way of learning/doing it.

I've found this site http://www.diyaudiocircuits.com/tutorials/8-step-sequencer/ wich uses the IC's 4093 and 4030 to impliment the functions i mentioned. I'm not 100% sure I understand what's going on here, the three seperate pictures are kind of confusing, but I tried my best interpreting it and setting it up, like the image show. Though it's not working and i dont know why.

Some questons:

Is it necessary to wire all unused CSMOS pins to either V+ or GND?
Is it common to use logic IC's like these when creating sequencers?
7400 or 4000 series when buidling synth?


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Grumble



Joined: Nov 23, 2015
Posts: 833
Location: Netherlands
Audio files: 27

PostPosted: Sun Dec 09, 2018 1:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Is it necessary to wire all unused CSMOS pins to either V+ or GND?

Only the inputs, yes that is necessary because you can get unwanted behavour of the so called floating inputs.

Quote:
Is it common to use logic IC's like these when creating sequencers?

Yes, you can use any logic ic for that matter, it only depends on what logic function you need.

Quote:
7400 or 4000 series when buidling synth?

Using 7400 series of logic constrains your design to 5 volt max. And are faster than the 4000 series.
The 4000 series may be directly powered from a 9 volt battery, since the commonly used max. power supply voltage is mostly up to 15 volts.
The logic functions are, (although not pin compatible) mostly found in both types of logic.

Btw: it is NOT a good idea to wire outputs together, although under some circomstances and using a special type of output configuration (open collector) it is possible. CLICK here to read more about logic, by Phobos.

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JovianPyx



Joined: Nov 20, 2007
Posts: 1717
Location: West Red Spot, Jupiter
Audio files: 195

PostPosted: Sun Dec 09, 2018 7:54 am    Post subject: Re: CMOS 4017 Based 8 Step Sequencer Reply with quote  Mark this post and the followings unread

wavejumper wrote:
Hello, first post, be kind!

So I've just started learning electronics and diy-synth-stuff. Have been messing around with 555 and APC and it's all working just fine. I would like to integrate an 8 step baby sequencer with functions like hold and step forward, some how Iv'e succeeded with the help of some of the common schemes floating arond the web, but I think it's very unstable and it does'nt feels like the correct way of learning/doing it.

I've found this site http://www.diyaudiocircuits.com/tutorials/8-step-sequencer/ wich uses the IC's 4093 and 4030 to impliment the functions i mentioned. I'm not 100% sure I understand what's going on here, the three seperate pictures are kind of confusing, but I tried my best interpreting it and setting it up, like the image show. Though it's not working and i dont know why.

Some questons:

Is it necessary to wire all unused CSMOS pins to either V+ or GND?
Is it common to use logic IC's like these when creating sequencers?
7400 or 4000 series when buidling synth?


Hi and welcome to EM!

The only CMOS pins that are necessary to send to V+ or ground other than power pins are input pins. This is because floating inputs can have noise that can have a toggling effect which creates yet more noise. Grounding or sending to V+ stops that.

Sure, you'll see here at EM many sequencer designs that are CMOS-based. They work very well and consume very little power.

Yes, TTL (7400) and CMOS are very common for musical applications. Please cruise the Lunetta area for examples, but also other areas such as Developer. Microcontrollers also (should you have interest).

The most important thing is - have fun! Smile

_________________
FPGA, dsPIC and Fatman Synth Stuff

Time flies like a banana.
Fruit flies when you're having fun.
BTW, Do these genes make my ass look fat?
corruptio optimi pessima
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