[sdiy] Generating +5V gate signals from +3.3V logic

[Andre Majorel]

On 2012-03-05 11:04 +0000, Tom Wiltshire wrote:
> On 5 Mar 2012, at 09:44, Andre Majorel wrote:

> > Gate outputs make good modulation sources for VCOs etc. It's
> > nice to be able to dial in a minor third and not have to redo it
> > after switching to another gate output or multing the gate to
> > another input. Which the usual 1 k resistor in series with the
> > op amp output prevents, BTW.
> 
> Ok, so what do you do for gate outputs then, Andre?

What Tony Allgood does in some of his modules : 75 ohm resistor
inside the feedback loop. The part I haven't figured out is how
to generate a +5.00 V (or, if possible +5.000 V) voltage without
using too many components. I suspect a voltage reference is
needed plus one comparator and one op-amp per gate.

-- 
André Majorel http://www.teaser.fr/~amajorel/