[sdiy] The fatman is finished...

[Gabriel Lindeborg]

Hi Harry!

Seems to be an all digital end error since the oscillators filter and 
amp. works fine, provided that they should be audiable when I crank the 
VCA Velocity pot up (I think they should, its a VCA bias right?).
At the moment I suspect a sinister eprom...

//Gabriel

harrybissell wrote:

> 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
> 
> 
>