[sdiy] 4017 sequencer update... success!!! ? !!

[Theo]

* What family of Cmos IC do you use,
CD40xx, HE40xx, HEF40xx are ok.
However HC40xx and HCT40xx won't work
as they run on 5V and not higher.

* What supply voltages are you running the Cmos ICs on?

-Vdd (+ supply pin of the Cmos) should be 15V and
the point labeled Vcc in the schematic are also +15V.

-Vss (- supply pin of the Cmos ) should be GND

* The TL074 should be powered with +15V and -15V.

When using these voltages you should get about +15V from the gate.
Not completely sure about the maximum CV out,
but it will be quite a bit higher than you have now.

Success,
Theo

BTW if you use 12V instead of 15V its also ok.



From: TheMysticSatin <elmystico at earthlink.net>

> Yes, those instructions helped in the extreme!  the + inputs  were
actually
> already grounded so that one was easy, then simply removing those +5v
> connections and rerouting a couple things has produced a very nice cv
> output.  here's my question... i seem to be getting fairly low voltages at
> the outputs.  I rigged up the range switch so it would just be at the 10v
> setting (now that I understand what's going on there!!) but the max cv
> output seems to be only about +2.5 V, it was even less in the way i had it
> originally routed, using the +5v max cv output configuration, close to
like
> +1v max.  I actually don't mind this because for my purposes i don't
really
> need the sequencer to have a massive octave range, what I am a little
> concerned about is the gate output which i would expect to be at +5 v
pulses
> for triggering EG's and such.  it's also down around +2.5 to +3v, any
ideas?
> or is this normal for this sequencer?
> gavin