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 Forum index » DIY Hardware and Software » Klee sequencer
A new Klee came to life
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Pehr



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PostPosted: Wed Apr 08, 2009 4:03 am    Post subject: Reply with quote  Mark this post and the followings unread

tommi wrote:
Thank you Bill, I 've sent you a PM Very Happy
I 've also noticed a strange behaviour on the random input: the reference pot seems to work only on the lowest part, let's say between seven and nine o' clock and after that it sees no more peaks. I 've tried to feed it with noises, lfos, etc etc but the signal seems to be too low. Or, better to say, the useful part of the pot's course it's just a little bit of the whole.
I 've seen on another thread that Pehr had the same problem, but I can't figure out how he fixed it.
Cheers,
t


yes, I have the same problem. But, haven't had any time to fix it. I think it works the same with no input too. I'll test it today after work.

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State Machine
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PostPosted: Wed Apr 08, 2009 5:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
That's right. I should have done this before... Iìll PM Pehr now


OK good. I will be away from any internet access for the entire weekend but will resume checking the forum on Monday.

Bill
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Pehr



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PostPosted: Wed Apr 08, 2009 11:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

weird, it works better now when I try it, but it's not perfect.

For a 6V p-p LFO the reference knob works from 0 to abt 11 o'clock.
I guess that is because the voltage reference is from 0-12V and the comparator only looks on the positive part of the LFO, ie 0-6V, due to the input diode.
Perhaps some modification of the comparator reference would work?

Glad Påsk!

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Scott Stites
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PostPosted: Sat Apr 11, 2009 9:13 am    Post subject: Reply with quote  Mark this post and the followings unread

I think that's about right, Pehr. There is a diode drop there, and the comparator is only going to look at the positive side of the signal. Slop is incorporated to accomodate any type of of input (one size fits all). For example, some LFOs operate from 0 to +10, etc. IOW, it sounds like yours is working as expected.
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Pehr



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PostPosted: Sun Apr 12, 2009 8:42 am    Post subject: Reply with quote  Mark this post and the followings unread

perhaps I'll add some sort of optional offset to use the whole voltage range of my lfos and noise
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Scott Stites
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PostPosted: Sun Apr 12, 2009 10:34 am    Post subject: Reply with quote  Mark this post and the followings unread

That's certainly possible; my mixer module has offset controls that I use for things like that.

But I'm not sure what the intent would be in this application? IOW, the random input is looking for something cyclical, either periodic or aperiodic. An LFO is going to go high as often as it goes low; a noise generator is going to go high as randomly as it is going to go low. Is it a matter of fine tuning you're thinking about here?

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tommi



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PostPosted: Mon Apr 13, 2009 3:51 am    Post subject: Reply with quote  Mark this post and the followings unread

I 've made another test and I 've noticed that feeding the random input with other signals than the ones I 've tried before gives me results that are close to what Pehr said. I mean that a ramp or saw or square wave from an LFO have higher peaks than sine or triangle wave and the same for a grainy noise, better than white noise for feeding the random input because it have more difference between the average level and the peaks.
With those signals i can see that the 'useful' range of the reference pot is from 7 to 11 o' clock (level pot is full CW). If I feed in weaker signals the useful range gets way smaller than that, so the tweaking of the reference knob have to be done very carefully in order to obtain a position wich is in the middle of all step on and all step off.
Maybe increasing the gain of the level could give more range?
Cheers,
tommi

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Pehr



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PostPosted: Mon Apr 13, 2009 8:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Well, it would be nice to be able to use the reference pot the whole way. I'll test with some external offset to begin with.
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Pehr



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PostPosted: Mon Apr 13, 2009 8:38 am    Post subject: Reply with quote  Mark this post and the followings unread

tommi wrote:
Maybe increasing the gain of the level could give more range?


yes, either gain (perhaps 2x ?) or offset as discussed above.

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tommi



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PostPosted: Tue Apr 14, 2009 7:25 am    Post subject: Reply with quote  Mark this post and the followings unread

I took a look at the schematics and realized that the random level pot isn't tied to a gain stage but it's just an attenuator, so there is no way to amplify an input signal that way... I don't know what could be done maybe tweaking with the reference pot.
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tommi



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PostPosted: Tue Apr 28, 2009 2:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Good news!!!
Last friday I received 4 spares TI4034 that Bill (State Machine) very kindly had sent to me and on sunday I mounted two on the digital board in substitution of my 4034SCLs. I fired on the Klee and the invert B bug was disappeared! Now I can play with it not being afraid of crashes!
Thank you Bill!

Very Happy

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EdisonRex
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PostPosted: Tue Apr 28, 2009 2:46 am    Post subject: Reply with quote  Mark this post and the followings unread

You know I had exactly the same problem with those 4034SCL chips - problems with invert, stuck bits, etc. In fact, one of the chips actually eventually blew up (BANG!). So I'm not surprised that replacing the chips fixed it.
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tommi



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PostPosted: Tue Apr 28, 2009 5:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Yep! The same BANG! happened to me the first time I turned on the Klee for testing it!
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PostPosted: Tue Apr 28, 2009 7:50 am    Post subject: Reply with quote  Mark this post and the followings unread

tommi wrote:
Yep! The same BANG! happened to me the first time I turned on the Klee for testing it!


Bet that made you feel wonderful, didn't it? If I hadn't aleady heard about the SCL chips being problems, I would have felt a lot worse over it. I already had the replacement chips!

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tommi



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PostPosted: Tue Apr 28, 2009 8:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Bet that made you feel wonderful, didn't it?

Yeah! Sweet moments...
I think we could write a book about the SCL behaviour now! Very Happy
But I remember I readed that someone got the Klee running perfectly with those chips... Lucky!

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Scott Stites
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PostPosted: Wed Apr 29, 2009 2:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

That would be me. Would you believe I used the SCL's all through development? Glad they didn't fork me over like that - I might have just said "Screw this, it doesn't work." Laughing

Glad to see it's working. And a big thanks to the State Machine....

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PostPosted: Thu Apr 30, 2009 8:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh! that 'someone' was you! That's funny! Very Happy
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