[sdiy] The fatman is finished...

[Gabriel Lindeborg]

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