As already mentioned I suppose the problems are caused by the foot switch
with does not simply open or close during operation but causes a
open-close-open-close-... sequence. Adding capacitor to the outputs (i.e.
between GND and the output) may solve the problem. One has to try out the
values as it depends upon the intervals betweend the opening/closing of the
foot switches. I'd start with 1uF electrolytic capacitor (plus = output,
minus = GND). Another solution would be to add an A-162 trigger delay. If
the pulse width of the A-162 is longer than the open-close sequence the
unwanted pulses will disappear.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von lre
> Gesendet: Sonntag, 3. April 2011 19:01
> An: Doepfer_a100@yahoogroups.com
> Betreff: 1 Re: 177-2 foot controller issues
>
>
>
>
> Hi --
>
> I'm hoping to pull my 177-2 back off the shelf again, and
> wondering if Dieter or anyone else using this module might be
> able to help out with the questions below. Thanks in advance!
>
> Ernst
>
>
> --- In Doepfer_a100@yahoogroups.com , "E_Karel" <ekarel@...> wrote:
> >
> > Hello Dieter,
> >
> > Thanks for your earlier responses. I dropped this thread and
> have been using my old 177, but I'd like to use the 177-2 if
> possible, so here are some more comments/questions:
> >
> > --- In Doepfer_a100@yahoogroups.com , <yahoo@> wrote:
> > >
> > > I suppose that it has to do with the bouncing of the
> contacts of your foot
> > > pedal (i.e. that releasing the pedal is not a clean on/off
> transition but a
> > > sequence of on/off/on/off transitions until the final state
> is reached). If
> > > the A-177-2 is used to switch a signal (e.g. by means of the
> A-150) this
> > > causes no problems but if the foot switch is used as a
> trigger (e.g. S&H or
> > > clock circuits) this may lead to a problem. Especially older
> contacts may
> > > generate a lot of bouncing.
> >
> > You're right about the 150, but when I use it with the 151 it
> goes crazy, and is basically unusable. Each trigger causes a
> flashing of lights and moves an unpredictable number of stages in
> the sequence.
> >
> > > Maybe adding a capacitor to the inputs will
> > > solve the problem. They would work like low pass filters that
> filter the
> > > bouncing pulses. One has to try it out as it depends upon the bouncing
> > > behaviour of the contacts. I'd start with ~ 100nF connected
> between GND and
> > > the foot switch inputs.
> >
> > Sorry, but I'm ignorant about these things -- how would I do
> this exactly
> >
> >
> > > > And isn't the behavior I mentioned in my second message quite
> > > > strange I'll quote it again here:
> > > >
> > > > "If I have output #1 from the 177-2 double footswitch patched to
> > > > the 165 trigger modifier input, and nothing patched from output
> > > > #2, only pressing footswitch #1 shows up on the LEDs on the 165.
> > > > Footswitch #2 appears to do nothing. So far so good. However, if
> > > > I patch from the mini-mult of the 165 to the trigger input of the
> > > > S&H 148, then even though only #1 registers on the 165, BOTH
> > > > footswitches #1 and #2 pass gate on to the S&H."
> > >
> > > That's indeed strange. I'll try to copy the behaviour in our
> demo system. It
> > > probably has to do with glitches and bouncing and the different input
> > > behaviour of A-165 and A-148 in case of glitches at the input.
> >
> > Did you happen to get a chance to look at this
> >
> > Thanks again!
> > Ernst
> >
>
>
>
>
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