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
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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>