There's two more differences between this pcb and schematic. I'm not
sure if the differences will matter, so I'll ask.
In the reset area of schematic shows: 15V to 110n cap, other side
of cap to 100K-gnd and the anode of diode. Cathode is connected to
junction of pin3 of opamp, 100k to ground and a 15K. The pcb has the
cathode connected to the other side of the 15K resistor (junction of
the 15K resistor and the 10n cap). PCB is connected before the 15K
resistor, the schematic is connected after the 15K.
The next difference has to do with the End Out section. Schematic
shows emitter through 1K resistor, then to the end out jack, and a
10K to ground. On the pcb the emitter connects to both the 1K and 10K.
Can you forsee any problems ? It looks pretty easy to mod the pcb
if necessary...I'd just rather do it before I get everything soldered
in.
Thanks,
P.v3
sure if the differences will matter, so I'll ask.
In the reset area of schematic shows: 15V to 110n cap, other side
of cap to 100K-gnd and the anode of diode. Cathode is connected to
junction of pin3 of opamp, 100k to ground and a 15K. The pcb has the
cathode connected to the other side of the 15K resistor (junction of
the 15K resistor and the 10n cap). PCB is connected before the 15K
resistor, the schematic is connected after the 15K.
The next difference has to do with the End Out section. Schematic
shows emitter through 1K resistor, then to the end out jack, and a
10K to ground. On the pcb the emitter connects to both the 1K and 10K.
Can you forsee any problems ? It looks pretty easy to mod the pcb
if necessary...I'd just rather do it before I get everything soldered
in.
Thanks,
P.v3
--- In cgs_synth@yahoogroups.com, sasami@h... wrote:
>
> Hmm.... interesting.....
>
> Just built it as is. 1.4 is the latest revision. I don't remember
why that
> diode was added. It prevents the reset pulse from being greater
than the
> supply voltage. It may have been added for a case when the engine
was being
> run off a lower voltage than the rest of the synth, or it may be an
artifact
> left over from the revision process. The truth is I don't remember.
>
> Ken
>
> >
> >
> > This question is regarding the components around the reset input
on
> >the 'M' board. I have REV1.4 pcb. Some component connections are
> >different than the schematic. For instance: At the junction of the
> >reset input-100K to gnd-10n cap there is a diode (anode)
connected
> >with cathode to +V. There's a couple others but It's hard to put
> >schematics into words.
> > Are these improvements on the design and the schematics are not
yet
> >updated or do I need to make adjustments to the pcb.
> >
> >Thanks,
> >P.v3
> >
> >
> >
> >
> >
> >
> >See the following URLS for the CGS Modular Synth home page:
> >Main: http://www.cgs.synth.net/
> >Secondary: http://otherunicorn.0catch.com/synth/
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
______________________________________________________________________
_
> Ken Stone sasami@h... or sasami@c...
> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies
<http://www.blaze.net.au/~sasami/>