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umschmitt
Joined: Jun 29, 2011 Posts: 189 Location: brrlin
Audio files: 11
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inlifeindeath
Joined: Apr 02, 2010 Posts: 316 Location: Albuquerque, NM
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umschmitt
Joined: Jun 29, 2011 Posts: 189 Location: brrlin
Audio files: 11
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Posted: Sun Dec 25, 2011 1:20 pm Post subject:
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Thank you ! I'll post it when it's done.
Concerning the circuit, with a non-depleting power supply, one could avoid using those zeners, replacing them with 2k4 resistors, if my maths are Ok. _________________ ::U::N::S::C::H::N::E::L::L:: |
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JingleJoe
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
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Posted: Fri Dec 30, 2011 5:09 am Post subject:
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What exactly does this circuit do? Does it make a pulse when the input signal starts? Or every cycle of the input wave?
I have a circuit for doing something similar, I used an integrator or differentiator (can't remember which) to make pulses when the input voltage changes sharply, even by less than 100mV. So I am interested to hear how your circuit behaves? |
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umschmitt
Joined: Jun 29, 2011 Posts: 189 Location: brrlin
Audio files: 11
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Posted: Fri Dec 30, 2011 8:51 am Post subject:
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It's just a stupid piece of circuitry that I needed for a mod in a mutant DS7 project (which you can find somewhere around). The idea is to make possible to trigger things from 'external' devices, like the ouput of your crappy drum machine, your grandma yelling in a microphone, etc… The options are wide.
It converts (sharp attack) signal to pulse, gate to pulse and even… erm, pulse to pulse.It consists of an all out amplifier, then a crude envelope follower, then a cap which lets just the beginning of the previous through, then a comparator to make things binary. Well I think it is so. Anyway it works (at 5V at least). So the pulse comes from signal. But if you have an extreeeemely low frequency signal, I suppose it would trigger at every cycle (like in : aren't pulse trains a kind of signal ?). It'd be interesting to know if the circuit would respond to sudden level changes, but I don't think so, since (I believe) the cap needs its input to be discharged in order to 'trig' again. Lots of guessing here and little certitude.
I'd be very much interested to see what your circuit looks like, perhaps by chance I could understand it… _________________ ::U::N::S::C::H::N::E::L::L:: |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Thu Jan 05, 2012 4:51 am Post subject:
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last year i made myself this comparator, that also creates a trigger pulse:
http://electro-music.com/forum/topic-51470.html
any two voltages are compared, the gate high of the comparator gets converted to a trigger pulse.
however, this circuit is DC coupled. would not work with audio... _________________
cheers,
matthias
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Big Boss at fonitronik
Tech Buddy at Random*Source |
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umschmitt
Joined: Jun 29, 2011 Posts: 189 Location: brrlin
Audio files: 11
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Posted: Fri Jan 06, 2012 3:37 pm Post subject:
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Thanks for the link ! I've met also this triggering on the falling edge thing ! For the scheduled use, I considered it as a problem, not a feature - eventually solved. Nevertheless, I think one can have it back by setting the trimpot (un)properly ! _________________ ::U::N::S::C::H::N::E::L::L:: |
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