okay awesome, that was totally it
Now other than the fact that i have the pots wired backwards DUSG seems functional!
Now other than the fact that i have the pots wired backwards DUSG seems functional!
--- In cgs_synth@yahoogroups.com, "ch1nard" <steve.benesko@...> 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 <http://www.cgs.synth.net/>
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> >
>