4559Re: ST7E and G-11
- Dec 1, 2001In addition to Ron's comments, the SBIG relay box uses reed relays;
the circuit referenced uses opto-couplers. Both are equally
effective in isolating the G-11 from the camera. BTW, for AC
operation, I used a 12v 1 A power supply (wall brick) from Radio
Shack for the mount.
--- In ccd-newastro@y..., "Jim Rucker" <yvonnejim@a...> wrote:
> --- In ccd-newastro@y..., "John Smith" <johnzonie@e...> wrote:
> > Hi Jim,
> > Depending on power systems and grounding, you may run into a
> > with guiding a G-11 with the ST-7E. Most often, an isolation
> > is needed. I built the circuit described at
> > http://www.mindspring.com/~dlakey/Optical-Isolation-Circuit.html
> > and had good luck using it with my ST-8E. Alternatively, you
> > need to purchase SBIG's relay box.
> > Some folks have burned out a chip or two in the G-11 due to
> > inconsistent grounding. Losmandy gets a fortune for the board,
> > although if you are handy, you can change out the chup yourself.
> > Best bet - use an isolation circuit!
> > HTH,
> Thanks, will the relay box from SBIG be as good as an isolation
> or is the relay box the same thing.
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