HOLY COW, i figured it out and i want to tell you guys but i really hope this doesn't earn me some sort of nickname because i'm pretty sure this may be a first.
Some how i used an led that is i believe a flashing led, i'm not quite sure but it does look to have a small black thing (ic ?) inside.
Either way when i put my meter on it it flashes at about 1 second intervals.Wow i get it now when people say each issue is unique !
I really appreciate your guys help i almost gave up on this one after replacing all the trannies and ic's but just figured that was the only active component i hadn't swapped so...
Thanks again for all the input i actually learned quite a bit on this one !
-Tony
Some how i used an led that is i believe a flashing led, i'm not quite sure but it does look to have a small black thing (ic ?) inside.
Either way when i put my meter on it it flashes at about 1 second intervals.Wow i get it now when people say each issue is unique !
I really appreciate your guys help i almost gave up on this one after replacing all the trannies and ic's but just figured that was the only active component i hadn't swapped so...
Thanks again for all the input i actually learned quite a bit on this one !
-Tony
--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
> Swap the LF353 IC. See if the fault moves with the IC or stays where it is.
> Swap the transistors with a new set.
> Ken
>
> >
> >Ok, i tried the suggestion Gary gave me and unfortunately no luck but thank
> you for the useful tool.
> >
> >I'm completely in the dark at this point so i want to explain whats
> happening and maybe someone can have an idea as to what could be acting up.
> >
> >It will self cycle but only at it's own fixed pace and does not react to
> triggers or signal input.While cycling if i drop the voltage by decreasing
> the fall pot past about 2 o'clock it will stop cycling.The led flashes at
> about 1 second intervals regardless of were i position the pot as long as
> it's past the 2 o'clock point but when i'm measuring the voltage on the out
> it behaves how you would expect (at it's furthest cw setting it takes about
> 2-3 minutes to fully drop to zero) as long as i stay cw of 2 o'clock.
> >It also outputs a pulse at the end of cycle.
> >
> >I've checked every single thing i can think of against the working half and
> everything seems to be the same, even the voltages on all the ic's and
> transistors.
> >
> >Thanks for all the help and suggestions so far !
> >
> >-Tony
> >--- In cgs_synth@yahoogroups.com, "adematteo" wrote:
> >>
> >> Thanks Gary i'll give that a shot.Your right i did use lead free solder
> and it's very difficult to tell if you have a nice joint so this technique
> will be helpful.
> >>
> >> Thanks Ken but i've checked the wiring so many times i have it memorized.
> >>
> >> I'll report back when i get this bugger working.
> >>
> >> Tony
> >>
> >> --- In cgs_synth@yahoogroups.com, "Mongo" wrote:
> >> >
> >> > I have had trouble getting DUSGs to work as well, and there is a
> technique I've found that seems to help quite a lot.
> >> >
> >> > I print out the picture Ken has on the webpage that shows the PC board
> traces. I then sit down with that page, a highlighter, the pc board, and an
> ohmmeter, and I check every single trace for continuity. The traces on these
> boards are somewhat fragile, especially if you use lead free solder (which
> requires higher temperatures). Just be patient and you can get through the
> whole thing in an hour or two. Whenever I've had a DUSG failure, this has
> found the problem for me.
> >> >
> >> > That being said, I'm troubleshooting a friend's VCS right now, and this
> hasn't helped a bit ;-)
> >> >
> >> > Anyway, give that a try. Chances are you will find an open trace.
> >> >
> >> > Gary
> >> >
> >> >
> >> > --- In cgs_synth@yahoogroups.com, "adematteo" wrote:
> >> > >
> >> > > Not sure if this is the best way to do this ? but figured if someone
> in the future searches better to have a few problems in 1 thread.
> >> > >
> >> > > Anyhow, i have 1 (1/2 of the board) of my dusg's working perfectly
> and the other not working at all as expected.
> >> > > The problem is no recognition of a trigger input or signal in for
> that matter unless i have the fall pot full cw then it seems to go into a
> slow self cycling.It needs a trigger to start this but does not sync with
> the trigger at all.As soon as i back off to about 2-3 o'clock it stops.
> >> > >
> >> > > These are the things i have checked/verified against the working half:
> >> > >
> >> > > -All ic;s getting and sending the same voltages as working half
> >> > > -Diode orientations
> >> > > -resitor values
> >> > > -Transistor orientation,proper part,voltages the same as working half
> >> > > -continuity through path of trig in to output
> >> > > -checked for solder bridges
> >> > >
> >> > > I'm out of ideas so i will really appreciate it if someone has some
> advice !
> >> > >
> >> > > Thanks, Tony
> >> > >
> >> > > --- In cgs_synth@yahoogroups.com, richmolindarius@ wrote:
> >> > > >
> >> > > > Fully agreed. The USG is my fave by far with the SSG following up
> in a close 2nd. :D
> >> > > >
> >> > > > On 2012-10-11, at 12:06 AM, Stephen Richards wrote:
> >> > > >
> >> > > > > My all time favourite Serge function block , DUSG rocks.
> >> > > > >
> >> > > > > ________________________________
> >> > > > > From: Rico Loverde
> >> > > > > To: cgs_synth@yahoogroups.com
> >> > > > > Sent: Thursday, October 11, 2012 1:51 PM
> >> > > > > Subject: Re: [cgs_synth] Re: CGS114 DUSG problems/troubleshooting
> >> > > > >
> >> > > > > awesome!!!
> >> > > > >
> >> > > > > On Wed, Oct 10, 2012 at 7:26 PM, ch1nard wrote:
> >> > > > >
> >> > > > > > **
> >> > > > > >
> >> > > > > >
> >> > > > > >
> >> > > > > > okay awesome, that was totally it
> >> > > > > >
> >> > > > > > Now other than the fact that i have the pots wired backwards
> DUSG seems
> >> > > > > > functional!
> >> > > > > >
> >> > > > > > --- In cgs_synth@yahoogroups.com, "ch1nard" wrote:
> >> > > > > > >
> >> > > > > > > ah yes, you appear to be correct good sir :)
> >> > > > > > > this would be reverse orientation for all trannies? (2N3904
> and 2N3906)
> >> > > > > > >
> >> > > > > > > i will switch them around after i get home from work and see
> if that
> >> > > > > > fixes things up.
> >> > > > > > >
> >> > > > > > > might need to hit up the parts store on the way home in case
> i pooched
> >> > > > > > any of them from being in backwards
> >> > > > > > >
> >> > > > > > > --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> >> > > > > > > >
> >> > > > > > > > Also make sure you are using the right sort of tranny! I
> had people
> >> > > > > > with
> >> > > > > > > > this problem on another project - and they had used the
> wrong sort of
> >> > > > > > tranny.
> >> > > > > > > >
> >> > > > > > > > >Are the trannies situated like the silk screen on the pcb or
> >> > > > > > reversed? They
> >> > > > > > > > >should be reversed.
> >> > > > > > > > >
> >> > > > > > > > >
> >> > > > > > > > >
> >> > > > > > > > >On Tuesday, October 9, 2012, ch1nard wrote:
> >> > > > > > > > >
> >> > > > > > > > >> **
> >> > > > > > > > >>
> >> > > > > > > > >>
> >> > > > > > > > >> Okay, i have been staring at this for almost a week
> without making
> >> > > > > > any
> >> > > > > > > > >> progress so its time to start asking around for help on
> figuring
> >> > > > > > out what
> >> > > > > > > > >> might be wrong with my DUSG build
> >> > > > > > > > >>
> >> > > > > > > > >> I am running this off +/-15v power supply and i have all the
> >> > > > > > connections
> >> > > > > > > > >> appear to be correct with no magic smoke escaping
> >> > > > > > > > >>
> >> > > > > > > > >> What is happening is that the output lights are lit up
> constantly.
> >> > > > > > > > >> When i hook it up to a scope it appears that both halves
> are cycling
> >> > > > > > > > >> (triangle) at about only 300mV p/p
> >> > > > > > > > >> -fiddling with the rise/fall gives minor variations but
> is still a
> >> > > > > > > > >> triangle. (never hits saw or ramp)
> >> > > > > > > > >> -feeding LFO into VC in shows the same minor variances
> as fiddling
> >> > > > > > with
> >> > > > > > > > >> the rise/fall knobs. bipolar control seems to work
> >> > > > > > > > >> -feeding a signal IN combines the signal with this triangle
> >> > > > > > oscillation
> >> > > > > > > > >> -trig and end do nothing
> >> > > > > > > > >>
> >> > > > > > > > >> now everything 'appears' to be wired up correctly and
> there were a
> >> > > > > > couple
> >> > > > > > > > >> of lifted pads that i was able to jumper patch around.
> >> > > > > > > > >> building this as part of a 'best of cgs' BOG panel, so
> the wiring
> >> > > > > > is well
> >> > > > > > > > >> documented.
> >> > > > > > > > >>
> >> > > > > > > > >> I have verified +/- voltage being delivered to all the
> TL072's and
> >> > > > > > > > >> verified + voltage for the LM3900's
> >> > > > > > > > >> ground appears to be delivered as well.
> >> > > > > > > > >> all the trans are correct value and orientation (2N3904
> and 2N3906)
> >> > > > > > where
> >> > > > > > > > >> applicable
> >> > > > > > > > >>
> >> > > > > > > > >> Anyways, eyes are too tired to look at this anymore
> tonight...
> >> > > > > > > > >> time to smoke a bowl and watch some doctor who.
> >> > > > > > > > >>
> >> > > > > > > > >>
> >> > > > > > > > >>
> >> > > > > > > > >
> >> > > > > > > > >
> >> > > > > > > > >--
> >> > > > > > > > >________________
> >> > > > > > > > >rico loverde
> >> > > > > > > > >415.596.6255
> >> > > > > > > > >ricoloverde.com
> >> > > > > > > > >
> >> > > > > > > > >
> >> > > > > > > > >[Non-text portions of this message have been removed]
> >> > > > > > > > >
> >> > > > > > > > >
> >> > > > > > > > >
> >> > > > > > > > >------------------------------------
> >> > > > > > > > >
> >> > > > > > > > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >> > > > > > > > >Yahoo! Groups Links
> >> > > > > > > > >
> >> > > > > > > > >
> >> > > > > > > > >
> >> > > > > > > > >
> >> > > > > > > > __________________________________________________________
> >> > > > > > > > Ken Stone sasami@ otherunicorn@
> >> > > > > > > > Modular Synth PCBs for sale
> >> > > > > > > > Australian Miniature Horses & Ponies
> >> > > > > >
> >> > > > > > > >
> >> > > > > > >
> >> > > > > >
> >> > > > > >
> >> > > > > >
> >> > > > >
> >> > > > > --
> >> > > > > ________________
> >> > > > > rico loverde
> >> > > > > 415.596.6255
> >> > > > > ricoloverde.com
> >> > > > >
> >> > > > > [Non-text portions of this message have been removed]
> >> > > > >
> >> > > > > ------------------------------------
> >> > > > >
> >> > > > > The CGS Modular Synth home page: http://www.cgs.synth.net/
> >> > > > > Yahoo! Groups Links
> >> > > > >
> >> > > > > [Non-text portions of this message have been removed]
> >> > > > >
> >> > > > >
> >> > > >
> >> > > >
> >> > > > [Non-text portions of this message have been removed]
> >> > > >
> >> > >
> >> >
> >>
> >
> >
> >
> >
> >------------------------------------
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >Yahoo! Groups Links
> >
> >
> >
> >
> _______________________________________________________________________
> Ken Stone sasami@... otherunicorn@...
> Modular Synth PCBs for sale
> Australian Miniature Horses & Ponies
>