[sdiy] The fatman is finished...

[harrybissell]

If you don't have a signal tracer... try making a divider of a 100K and a 10K
resistor with the signal taken from across the 10K going to your amp
(turned down REAL low to start with).   That will work as a signal tracer for
your
needs. Then do what Scott suggested.

I have a cable with these resistors installed in the plug (amp end) and two
MINI HOOKS
on the other end (signal / ground).

WARNING: This is assuming a guitar or similar amp that has a capacitor in
series with the
input. A direct coupled amp could FRY speakers if you hooked up DC signals
(and with a
signal tracer, you can - easily)

Of course you should be flogged for not having a scope but that is another
story :^P
you will be given a break since its a Fatman

H^) harry

Gabriel Lindeborg wrote:

> Hi Scott!
>
> Scott Gravenhorst wrote:
> > Hi Gabriel,
> > What test equipment do you have access to?  A scope is really helpful if
> > you have on or can borrow one.
> >
> No scope for the weekend...
> Dig. Multimeter at hand.
>
> > The MIDI LED flashing is good.
> >
> > Does the GATE LED come on?
> No...
>
> > Have you tried using each MIDI channel one at a time each in turn?  (If
> > there's something not right with the dip switch, you'll discover it this
> > way).  If you find a DIP setting that causes the GATE LED to light when
> > a key is down, you've got the MIDI channel set to the one the FatMan is
> > actually listening to.  If the setting doesn't look right, there's
> > something amiss with the DIP switch.
> Tried all channels multiple times, no success.
>
> >
> > The GATE signal is required or the ADSR won't cycle.  The ADSR supplies
> > the required signal to the VCA control input.
> >
> > I read your other message, sounds like you have at least used a signal
> > tracer.  The VCOs output a constant signal regardless of whether a key
> > is down or not.  Check the output of the VCF, it should also have a
> > constant output.
> I simply turned up the VCA Velocity, no problemo with the oscillators
> vca or filter...
>
> The CVs changes every time I turn it on, the gate remains 0V.
> The uP seems to function as the address lines seem to stay of 5V or 0V
> sadly at fixed value, could indicate a loop (could also indicate
> somethings really wrong or that everythings ok...).
> Vcc to logics all 4,8-4,9V.
> The uP output at o14/pin4 to gate/envelopes stays at 3,6V all the time.
> The uP output at o13/pin3 to envelopes stays at around 1,8V.
>
> >
> > Let me know about the above questions, I'll have more depending on the
> > answers.
>
> That´ll be great!
>
> //Gabriel