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 Forum index » Clavia Nord Modular » G2 Building Blocks
DSP-cheap up/down counter circuit
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1017
Location: Zürich, Switzerland
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PostPosted: Wed Jun 29, 2005 2:37 am    Post subject: DSP-cheap up/down counter circuit Reply with quote  Mark this post and the followings unread

Here's an efficient up/down counter circuit I came up with some time ago, using a feedbacked mixer as a variable.

The "count" and "reset" buttons can obviously be replaced by logic triggers in order to build up/down sequencers etc. ...

Hope it is useful.

regards,
tim


Counter TK.pch2
 Description:
DSP-efficient multipurpose up/down counter

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 Filename:  Counter TK.pch2
 Filesize:  1.11 KB
 Downloaded:  1259 Time(s)


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ian-s



Joined: Apr 01, 2004
Posts: 2564
Location: Auckland, New Zealand
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PostPosted: Wed Jun 29, 2005 4:11 am    Post subject: Reply with quote  Mark this post and the followings unread

very neat, a flip flop as a 1 clock pulse generator. Smile
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mosc
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Joined: Jan 31, 2003
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PostPosted: Wed Jun 29, 2005 10:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Very useful. I like this. Great improvement over earlier circuits.

Here is a slight improvement. With this circuit, you can now set the reset value. It becomes a PRESET value.

I changed the STEP SIZE circuit to be a unipolar constant. This has the advantage of being able to set it to quarter tones.

Also added a FWD/REV switch and level detector circuit so direction can be controlled by a control, in this demo case, by an oscillator.

Also added UPPER and LOWER limits for the counter.

==============================

Things to improve. Now when an upper or lower limit is hit, the counter jumps to the PRESET value. There should be a circuit to cause it to jump to the opposite limit; digitally controlled, of course.

Thanks, Tim. Very Happy


==============================

BTW, is there a better way to get a -64 constant, or to get a controllable voltage inverter than what I used? Seems pretty ugly to me. Laughing


Up Dwn Pst Count.pch2
 Description:
Up/Dwn Counter with Preset, adjustable limits, step size and controlled FWD/REV

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 Filename:  Up Dwn Pst Count.pch2
 Filesize:  1.73 KB
 Downloaded:  1304 Time(s)


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ian-s



Joined: Apr 01, 2004
Posts: 2564
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 600

PostPosted: Wed Jun 29, 2005 2:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

mosc wrote:
BTW, is there a better way to get a -64 constant, or to get a controllable voltage inverter than what I used?


A LevelConv does it quite well, select Pos for in signal type and bipolar out, changes the 0,1 pulse into a -1,1
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Blue Hell
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PostPosted: Wed Jun 29, 2005 3:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

Not for use right now, but I'll remeber this - thanks. To you as well Howard, some interesting mods you made.

Jan.
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Tim Kleinert



Joined: Mar 12, 2004
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Location: Zürich, Switzerland
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G2 patch files: 211

PostPosted: Thu Jun 30, 2005 1:48 am    Post subject: Reply with quote  Mark this post and the followings unread

Great stuff, Howard.

There's many things that can be done to this circuit. That's the reason why I decided to post only the very basic core, leave the rest up to the end user.

Eg., here's another application: using the circuit as a DIY sawtooth oscillator with linear frequency input.

It's admittedly rather pointless but was fun to patch up right now while I'm drinking my morning coffee Smile.

Fun to hear these sounds and not see any oscillator or filter modules on the screen. Cool

Update: check out this (http://electro-music.com/forum/post-44650.html#44650) if you are interested in this stuff


DIY Osc TK.pch2
 Description:
where are the osc and filter modules?

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 Filename:  DIY Osc TK.pch2
 Filesize:  1.31 KB
 Downloaded:  847 Time(s)


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