Doepfer

That's what the transistor inputs of the A-100 gate inputs do - although it's not exactly the same as a comparator. I.e. any
positive voltage beyond ~ +3V is treated as "high".

Best wishes
Dieter Doepfer


> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
> Gesendet: Dienstag, 7. Juli 2015 15:47
> An: doepfer_a100@yahoogroups.com
> Betreff: RE: AW: [Doepfer_a100] The A185-1
>
>
>
>
>
> It's good that a lot of modules now have comparators on the inputs that trigger off pretty much any positive voltage.
> It's a luxury really but worth considering for future Deopfer modules as well.
>
>
> > To: Doepfer_a100@yahoogroups.com
> > From: Doepfer_a100@yahoogroups.com
> > Date: Mon, 6 Jul 2015 18:04:34 +0200
> > Subject: AW: [Doepfer_a100] The A185-1
> >
> > Module A-185-1 was designed in 1997 and at this time there were no other (or only a few) other module manufacturers on
> the market.
> > The gate section of the A-185-1 is only a buffer (nothing but a so-called emitter follower) but does not increase the
> gate voltage.
> > Rather the emitter follower lowers the voltage a bit (by about 0.7V). The A-185-1 was designed to be used with A-100
> modules only
> > and for A-100 modules there was this rule for gate voltages: <1V means low and >3V means high. All A-100 modules that
> process gate
> > signals (especially envelope generators, clock divider, trigger delay and so on) have usually a transistor at the gate
> input that
> > requires about 1.5-2 V to trigger. But I'm aware that things have changed and we will redesign the A-185-1 so that the
> gate output
> > voltage can be set to +5V or +12V (probably by means of a jumper) and that it does no longer work as a buffer.
> >
> > Best wishes
> > Dieter Doepfer
> >
> >
> > > About the A185-1
> > >
> > > Maybe it's just me using the module the wrong way.
> > >
> > > This is the setup:
> > >
> > > A190-1 Clock Out ---> 1st A185-1 Gate In
> > >
> > > 1st A185-1 Gate Out ---> 2nd A185-1 Gate In
> > >
> > > 2nd A185-1 Gate Out ---> Intellijel Metropolis Gate In
> > >
> > >
> > > The Metropolis (and probably other modules too) doesn't trigger well because the gate signal is too weak. I did some
> measurements.
> > >
> > > A190-1 Clock Out ------ +4.1V
> > > 1st A185-1 Gate Out --- +3.4V
> > > 2nd A185-1 Gate Out --- +2.7V
> > >
> > > Why not keep the gate signal as say +5V?
> > >
> > > For this purpose I build myself a simple "Gate Amp". Just an idea.
> > >
> > > Best regards,
> > > Karel.
> >
> >
> >
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