Sorry, that came out as a big garbled mess.
1) +13.54
2) 0
3) -9.23
4) -14.35
5) +11.13
6) -0.113
7) -15
8) -.010
9) 0
10) -.112
11) -.115
12) +13
13) -4.92 (Stepped U5) +12.64 (Smoothed U2)
14) +15
1) +13.54
2) 0
3) -9.23
4) -14.35
5) +11.13
6) -0.113
7) -15
8) -.010
9) 0
10) -.112
11) -.115
12) +13
13) -4.92 (Stepped U5) +12.64 (Smoothed U2)
14) +15
--- In cgs_synth@yahoogroups.com, "adematteo" <adematteo@...> wrote:
>
> So all the voltages read the same on both chips except for pin 13 which i make a note of :
>
> 1) +13.54 14) +15
> 2) 0 13) -4.92 (U5 Stepped) +12.64 (U2 Smooth)
> 3) -9.23 12) +13
> 4) -14.35 11) -.115
> 5) +11.13 10) -.112
> 6) -0.113 9) 0
> 7) -15 8)-.010
>
> --- In cgs_synth@yahoogroups.com, sasami@ wrote:
> >
> > Seriously, chip frying is indication of serious power routing issues.
> >
> > With the chips OUT, read the voltages on each pin of the socket, then list
> > them here.
> >
> > Ken
> >
> > >Thanks again Ken, and Rich for all the helpful suggestions.
> > >I've triple checked component values at this point,replaced
> > trannies,ic's,gone over continuity testing and visually inspected the board
> > under a magnifying lens with no luck.
> > >
> > >There has to be a short or something that i am just not seeing because i'm
> > getting inconsistent results when i plug it in every time i make a change.I
> > fried another lm3900 in the smooth section only this time it took a few
> > minutes.I've been able to get a slewed/smoothed signal to pass but no
> > control over the hold or rate, i've gotten a steady tone from plugging the
> > cycle into the in of the smooth section but again no control to change the
> > pitch and now i'm back to were i started with no effect and a strong
> > negative voltage on the outputs ?
> > >
> > >I'm gonna take a little break but at this point i'm seriously considering a
> > do over.
> > >
> > >Thanks again guys i really appreciate you taking the time to offer your
> > time and experience !
> > >
> > >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> > >>
> > >> Been thinkng about this - The problem may also be caused by putting a
> > >> voltage on the input pins, which are designed for current, not voltage.
> > >> Check nothing is shorted to them. Check your resistor values. Maye sure you
> > >> haven't installed 15 ohms instead of 1M.
> > >>
> > >> Ken
> > >>
> > >> >Will do.Thanks guys!
> > >> >I'll report back when i get this working.
> > >> >
> > >> >--- In cgs_synth@yahoogroups.com, Richarius Molindarius
> > >> <richmolindarius@> wrote:
> > >> >>
> > >> >> Use a well lit magnified lamp. Especially for that board. Hard to find
> > >> >> small trace breaks and bad solder joints.
> > >> >>
> > >> >>
> > >> >> [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/>
> > >> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
> > >>
> > >
> > >
> > >
> > >
> > >------------------------------------
> > >
> > >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/>
> > Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
> >
>