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Topic: Digitize Sound from 8MM?
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Steve Klare
Film Guy
Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003
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posted December 29, 2017 09:50 PM
Something you have to be careful of, especially with the Eumig 800 series is ground loops. The hum performance with these is not the best (usually good enough), but when you connect them to another grounded device it can get downright awful!
A big part of the problem is the main transformer is pretty well grounded, but there isn't any ground wire directly to the frame of the machine. That connection is through the mounting screws. What you can do to improve this is take (at least) one of the transformer mounting screws out and slip a star washer under it and tighten it down snugly. You should also plug your computer into the same outlet as the projector.
I have pretty decent ground loop rejection with my sound system yet a few weeks ago my Eumig 800 actually succeeded in overwhelming it and putting a buzz In my speakers. I measured the voltage between the Eumig chassis and good ground and saw almost a volt! I put in some star washers, measured it again, and the voltage dropped down to .03 Volts. The buzz hasn't been back ever since.
If you connect everything up and this happens to you, please just remember this post. You may get even a good one and not have the problem too, it's just a problem of variability.
-and while I'm at it, the Eumig 800s are by and large very good machines, you just need to work with small issues like this and you'll do just fine!
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All I ask is a wide screen and a projector to light her by...
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Pere Pasqual
Film Handler
Posts: 43
From: Gandia, València, Spain
Registered: May 2017
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posted January 02, 2018 02:22 PM
Hi people, I'm not sure if this is the best place to write this; I was about to open a thread for this but I see you seem to be experts on Eumig s810d. I got one of these real cheap some weeks ago from a flea market, I thought the lens was broken but it was simply out of place and it turned to be in a very good condition - after cleaning its internals, it was intact on the inside and even the bulb was working!
Unfortunately, after 10 minutes of playing or so, a big "pop" sound made appearance and sound disappeared from then. I examined the mechanism and noticed a fuse was burned - replaced it and the new one immediately got fused too after turning on. So it's clear that something is broken on the sound PCB.
Do you have any recommendation on what to check for on these boards? Any common faulty component? Is this defect common on these machines? Is it easy to repair?
I could attach some picture but at first sight I don't seem to spot any abvious exploded or burned component, other than the recurrent fuse.
Also I have a dismantled Bolex SP80E I've been restoring for the last 6 months or so ![[Big Grin]](biggrin.gif) (I tend to approach these tasks with great patience and often I never finish them ![[Razz]](tongue.gif) ) which, appart from having a slightly smaller casing, a 50 W bulb and a smaller lens, looks to me exactly the same on the inside, and I could try swapping the boards, but I'd like to keep both machines operative if possible and also I'm not totally sure they are 100% compatible...
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