[sdiy] Triggering problems with sequencer. Any thoughts?

[Peter Grenader]

You've got the signals you need already - you just have to buffer them. The
easiest way of creating a gate is simply buffering each output of the
counter - the same signals that are fed to the pots.  What I think I'm
seeing here is you're taking the OUTPUT of the pots - the summer -  and
trying to recreate the gate from those.  No need.  the outputs of the
counter are the gates.

If you want triggers from those (predetermined on time which is shorter than
the gate duration, there are a few ways of going about this.  A one shot
comes to mind -  which can be as simple as an R/C at the base of a NPN with
a second NPN after that to pull the trigger back into phase.

mark verbos wrote:

> mult the trigger from the input?
> 
> 
> 
> 
> 
> Rykhaard D.A.M.I.A.N. wrote:
>> Help! :(
>> 
>> I've successfully got my 4 steps working, with a single 12 position (1
>> octave) rotary switch on each step.
>> 
>> I'm now trying to derive a Gate or Trigger FROM each step when it
>> occurs.  The best I've been able to do, is get a Trigger out to one of
>> my envelope generators, when there's a larger than smaller transistion,
>> between voltages from the Control Voltage out summer.  (Summing all of
>> the rotary switch outputs to a single CV out, which itself is working
>> perfectly.)
>> 
>> As an example - say that I have the 4 notes set on the rotary switches to:
>> 
>> C1 (lowest pitch)
>> C2 (highest pitch)
>> E1 (2nd lowest pitch)
>> B1 (2nd highest pitch)
>> 
>> I'm only getting Triggers, from the Highest and 2nd Highest pitch, due
>> to the difference in voltage out of the CV summer.
>> 
>> I've tried the following combinations on the comparator, that is setup
>> with the following resistor divider on it's negative input:
>> 
>> - +15V through 1M8 to negative input
>> - Negative input through 15K to Ground
>> 
>> On the positive input of the comparator, I've tried:
>> 
>> - CV Out through 0.1uF to positive input; 1M to ground
>> - CV Out through 0.1uF to positive input; 2M to ground
>> - CV Out through 0.001uF to positive input; 1M to ground
>> - CV Out through 0.01uF to positive input; 1M to ground
>> - CV Out through 0.01uF to positive input; 200K to ground
>> 
>> Almost all of them gave me the above description.  The worst (0.1 / 1M)
>> gave me a Trigger on only the very highest voltage.
>> 
>> What can I do, to get a new trigger, from every single step?  (All steps
>> are coming from the 4051 1:8 multiplexer.)  Would I have to have a
>> separate 4051, generating a Gate/Trigger, each time?  (That's my
>> thoughts, now.  Which could be handy for more effects. :) )
>> 
>> Thanks for any help. :)  At least 1 wav file'll be up at my webpage, as
>> soon as I get a Gate or Trigger functioning properly. :)  (Then I'll get
>> the 2nd rotary for each step done as well, so that I can alternate
>> between each pair, on each step. :D )
>> 
>> -- 
>> Take care,
>> Warmth and Peace,
>> Ryk
>> 
>> http://deathlehem.bravehost.com/damian.html - D.A.M.I.A.N.;s webpage -
>> Dec 2705 update