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Pehr
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
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Posted: Wed Apr 08, 2009 4:03 am Post subject:
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tommi wrote: | Thank you Bill, I 've sent you a PM
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. _________________ YouTube channel
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State Machine
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Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Wed Apr 08, 2009 5:46 pm Post subject:
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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
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
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Scott Stites
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Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Sat Apr 11, 2009 9:13 am Post subject:
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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. _________________ My Site |
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Pehr
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
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Scott Stites
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Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Sun Apr 12, 2009 10:34 am Post subject:
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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? _________________ My Site |
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tommi
Joined: Dec 05, 2007 Posts: 247 Location: Italy
Audio files: 3
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Posted: Mon Apr 13, 2009 3:51 am Post subject:
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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 _________________ http://soundcloud.com/mister-vommi
http://tideofsound.net |
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Pehr
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
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Pehr
Joined: Aug 14, 2005 Posts: 1307 Location: Björkvik, Sweden
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tommi
Joined: Dec 05, 2007 Posts: 247 Location: Italy
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Posted: Tue Apr 14, 2009 7:25 am Post subject:
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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. _________________ http://soundcloud.com/mister-vommi
http://tideofsound.net |
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tommi
Joined: Dec 05, 2007 Posts: 247 Location: Italy
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Posted: Tue Apr 28, 2009 2:21 am Post subject:
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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!
_________________ http://soundcloud.com/mister-vommi
http://tideofsound.net |
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EdisonRex
Site Admin
Joined: Mar 07, 2007 Posts: 4579 Location: London, UK
Audio files: 172
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Posted: Tue Apr 28, 2009 2:46 am Post subject:
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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. _________________ Garret: It's so retro.
EGM: What does retro mean to you?
Parker: Like, old and outdated.
Home,My Studio,and another view |
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tommi
Joined: Dec 05, 2007 Posts: 247 Location: Italy
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EdisonRex
Site Admin
Joined: Mar 07, 2007 Posts: 4579 Location: London, UK
Audio files: 172
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Posted: Tue Apr 28, 2009 7:50 am Post subject:
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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! _________________ Garret: It's so retro.
EGM: What does retro mean to you?
Parker: Like, old and outdated.
Home,My Studio,and another view |
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tommi
Joined: Dec 05, 2007 Posts: 247 Location: Italy
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Posted: Tue Apr 28, 2009 8:09 am Post subject:
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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!
But I remember I readed that someone got the Klee running perfectly with those chips... Lucky! _________________ http://soundcloud.com/mister-vommi
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Scott Stites
Janitor
Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Wed Apr 29, 2009 2:05 pm Post subject:
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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."
Glad to see it's working. And a big thanks to the State Machine.... _________________ My Site |
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tommi
Joined: Dec 05, 2007 Posts: 247 Location: Italy
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