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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
Cgs10 question
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Cfish



Joined: Feb 24, 2016
Posts: 449
Location: Indiana

PostPosted: Sun Mar 06, 2016 8:05 pm    Post subject: Cgs10 question Reply with quote  Mark this post and the followings unread

I have recently built a volt per octave key pedal set and used the Ken Stone schematic using the 74c922 key encoder IC.

The reaction time is quite noticeably slow on each key press. I was curious if this was normal for this circuit? Or do I possibly have a generation of IC that is slower than normal?

My IC is labeled Fbh52ab. mm74c922n ins8245n.
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prgdeltablues



Joined: Sep 25, 2006
Posts: 221
Location: UK
Audio files: 12

PostPosted: Mon Apr 18, 2016 1:51 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi, I've just breadboarded this circuit too. I find the keys don't always produce the right output - sometimes takes two or three presses. It might be the breadboard, or the keypad.

I reduced the size of the caps on the osc and kdb inputs, which seems to have helped. If you look at the datasheet you will see Ken has more or less just used the middle of the indicated range of values (though the datasheet suggests one cap should be x10 the other, not x22 as Ken has). You can go down to 100n/10n or up to 10u/1u. Might be worth trying in your case.

Peter
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Cfish



Joined: Feb 24, 2016
Posts: 449
Location: Indiana

PostPosted: Mon Apr 18, 2016 4:23 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks. I forgot I had this up here. We had a discussion on this circuit In The layout factory section titled (Basic volt per octave kayboard schematics ) There are 3 pretty good schematics there. The one at the very end is what I wound up using. grumbles Circuit with gate added.
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