PLAN B analog blog

Bryan,

The best way to check this is to turn the deviation to zero, the speed
fully clockwise and then manually move the mean pot full range.  you
should see the voltage swing from full negative to full positive. 
this test works for both the stepped and smooth sections and
demonstrates the available rage of each. Once the deviation is
increased anything else that occurs is random.  If you're not seeing
something that's bipolar enough due to the randomization at any given
time, then move the mean pot to offset the range of the fluctuations
that are occurring up or down so that they are.  

- P




--- In PLAN_B_analog_blog@yahoogroups.com, "Bryan E Cornell"
<bcor@...> wrote:
>
> I've been looking at the voltages from my M24 (Heisenberg Generator)
and  I have some questions.  The patch is simplicity itself: stepped
or smooth output to my Velleman panelscope.  What I'm seeing does not
conform to what I'm expecting from the descriptions and diagrams at
http://www.ear-group.net/model_24.html .   According to that (if I
understand things correctly) I should be seeing voltages randomly
varying from -6 to +6 volts with the Mean pot in the middle and with
the Deviation knob clear to the right.
> 
> For the stepped section of the module, I only get the full -6 to + 6
when the mean is all the way to the left.
> 
> The output from the smooth section almost never goes below zero
volts.  Is this how it should be?  At no setting on the knobs do I see
a random voltage smoothly swinging from -6 to + 6.  In fact with the
deviation knob at full CCW the voltage seems vary between -1.4 to
+2.18 when adjusting the mean.
> 
> When adjusting the mean knob from the stepped output with deviation
full ccw the voltage goes from -9.2 to +10.4.  Is this correct?
> 
> Thanks,
> 
> Bryan
>