Someone has already probably said, watch out for switching regulators. BTW, almost all the Hp instruments I have from the 80's era run hot as heck. I have put on fans and piggybacked more fins (and more fins, and more fins...). A Military version of the 5328A counter I have has what sounds like a leaf blower in it, with a proportional controller added. If you do some work with switchers, I'm sure the list would be very interested! Don
Don Perry Sandeen via time-nuts > Hi, > Wrote: Since the front end chips are mixed signal ASIC’s, it will take more > than a bit of time to replace them directly. Re-doing the entire front panel > board is the most likely way to “fix”the problem. The question is - why do > that at all? Just do a PC instrument that does the same thing as the counter > with way less effort….. > Well, I have two reasons not to. > First I have about $1800 invested in my 3 5370’s including the new CPU boards > and blowing that off is not in my budget. I’ll kludge the living daylights out > of my units before blowing off my investment. > Second, I haven’t the slightest clue on how to do a PC instrument and I have > to many other projects to finish to learn something new. > Also there was much discussion about A and B cooling in the past and it seems > the only things some did to their units was the addition of fan(s) on the > cooling fins. I had an external fan on a B I was running and the thing still > was too hot. > IMNSHO, I believe the front end chip failure is aggravated by the high > interior heat level. I’m committed to a number of other projects so it will > be a while before I can work on mine. > I’ll either rip the whole PS out and put it on another chassis, try better 3 > terminal regulators instead of the installed pass transistors, install > switching regulator PS’s in place of the original PS, cut holes in the top lid > and install 10 or 12 computer fans. Or a combination of the afore mentioned. > I don’t give a rat’s behind how it will look. I’m only interested in it > working properly. I’ve spent 50 years in the electronics industry and I will > find a way to skin this cat. I’ve done this to other equipment before. And > when done I’ll tell the list how I did it. > Regards, > Perrier > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > -- Felix qui potuit rerum cognoscere causas. Lucky is he who has been able to understand the causes of things. Virgil ------------------------------- "Noli sinere nothos te opprimere" Dr. Don Latham, AJ7LL Six Mile Systems LLC, 17850 Six Mile Road Huson, MT, 59846 mailing address: POBox 404 Frenchtown MT 59834-0404 VOX 406-626-4304 CEL 406-241-5093 Skype: buffler2 www.lightningforensics.com www.sixmilesystems.com _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
