Moderators: Kent, lisa, luketeaford, Joe.
, it seems the opamps blow out fairly easily. Also, some transistors too. 
Can you name one product that has a boxed header oriented the wrong way? All the ones I've seen have been oriented the same way. With pin 1 at -12v. The problem comes from people using ribbon cables that were not made correctly for use with boxed headers. Many manufacturers made (make) their ribbons with no care about the female connectors being oriented correctly because traditionally Doepfer and early manufacturers never used box headers, so the orientation wasn't important.... Maybe a good idea seeing as module manufactureres can't agree on the correct way to orient a boxed header.
This. Euro with boxed headers is the safest of all because it is so hard to force any contact between the pins when the key says no. Considering these connectors were the standard for hard drives for 20 years it's amazing that manufacturers can't orient a cable striple to the "1" marker on an IDC line socket...daverj wrote:Can you name one product that has a boxed header oriented the wrong way? All the ones I've seen have been oriented the same way. With pin 1 at -12v. The problem comes from people using ribbon cables that were not made correctly for use with boxed headers. Many manufacturers made (make) their ribbons with no care about the female connectors being oriented correctly because traditionally Doepfer and early manufacturers never used box headers, so the orientation wasn't important.
Now that boxed headers are becoming more popular it is important for manufacturers to start paying attention to how they make their ribbons. But even more importantly, the users have to pay attention to the ribbons they own if they have bus boards with boxed headers. They shouldn't just plug the ribbons in blindly. They should check that they were made correctly for use with boxed headers. And if not, replace the ribbon (or remake them).
OT, but I used to work for Philips Medical Systems on the development of MRI scanners, we had a complete hall with test systems, and always people working on them. Really had to pay attention! Only managed to get all my bank cards erased once :-)decaying.sine wrote:MRI safety at the imaging research center at UCSD. You see it all the time. People just tend to forget they are dealing with technology that is powerful and destructive. Well trained folk walk into the magnet room with cameras, as an example, which does not end well.
Even worse is not caring about your OWN standards: I recently bought my first non-DIY module - a Doepfer A-119. It came with a ribbon cable where the 16 pole end was flipped. i.e. the red wire was aligned to +12V on the module, but -12V on the Doepfer busboard...Can you name one product that has a boxed header oriented the wrong way? All the ones I've seen have been oriented the same way. With pin 1 at -12v. The problem comes from people using ribbon cables that were not made correctly for use with boxed headers. Many manufacturers made (make) their ribbons with no care about the female connectors being oriented correctly because traditionally Doepfer and early manufacturers never used box headers, so the orientation wasn't important.
Doepfer should really use box headers, but it won't help if they flip their ribbon cables...
The screwbit would be a nasty little projectile. Worst thing I ever witnessed was...I was testing out some new things for my research. I had the chief technologist (basically, the head scanner operator for the facility and in charge of safety) put me in the scanner for some tests. I heard this big "thunk" noise. I said "what the heck was that." He said, "shit, I forgot to take my pocket knife out of my pocket." Basically, it got sucked out of his pocket and whizzed by my head and onto to the side of the bore of the magnet. No harm, no foul, I guessJarno wrote:OT, but I used to work for Philips Medical Systems on the development of MRI scanners, we had a complete hall with test systems, and always people working on them. Really had to pay attention! Only managed to get all my bank cards erased once :-)decaying.sine wrote:MRI safety at the imaging research center at UCSD. You see it all the time. People just tend to forget they are dealing with technology that is powerful and destructive. Well trained folk walk into the magnet room with cameras, as an example, which does not end well.
Somehow an ordinary screwbit wound up in a box with non-magnetic tools one day, and when somebody opened it in the vicinity of a 1.5T system, instant bullet flying through the bore, luckily nobody got hurt.
But lots of pictures of office chairs and floor polishers stuck to a MRI systems at hospitals, looks funny, but probably pretty scary if you are in the vicinity of it happening.
On topic, I have a MFOS VCA which I had to replace discretes a couple of times because one of the rails failed, not even reverse polarity. But I had some TL074 survive reverse polarisation without a hitch (usually replace them anyway).
I have an ASol MX61 module that has a boxed header the wrong way around. I had to make my own cable for it.daverj wrote:Can you name one product that has a boxed header oriented the wrong way?... Maybe a good idea seeing as module manufactureres can't agree on the correct way to orient a boxed header.
