VCF videos ahoy
Tonight we posted a bunch of old (1997-2007) VCF West videos. Please see http://vcfed.org/wp/2016/09/03/many-more-videos-are-posted/. Many more will be posted soon.
Re: DEC Indicator Panels page
On Thu, Aug 18, 2016 at 8:56 AM, Noel Chiappa wrote: > So, I've been working for a while on a page about DEC indicator panels (the > standardized 36x4 light arrays which go into a 19" rack, with an inlay to > customize it to a particular device). It's online now, here: > > http://ana-3.lcs.mit.edu/~jnc/tech/DECIndicatorPanels.html > > Does anyone happen to have a good image of an RK08 panel, or an RF11, which I > can use here? > > Even better, does anyone know of, or have images of, panels which are not > listed here? (I am not including the unknown 'RK' panel in the RSTS document, > which will be the subject of a separate message.) > > Thanks! > > Noel Noel I have taken better pics of the pdp-15 panels. FP15: http://www.corestore.org/FP15ind.jpg RP15: http://www.corestore.org/RP15ind.jpg TC59: http://www.corestore.org/TC59ind.jpg I'll take some more when I'm at the point where I can light them up :-) http://www.corestore.org 'No greater love hath a man than he lay down his life for his brother. Not for millions, not for glory, not for fame. For one person, in the dark, where no one will ever know or see.'
Power Supply capacitor physical size
Hi folks, Looking at the PSU of my Lisa's ProFile after it died gracefully not so long back and it obviously needs new caps since one of the 1000uF 16V ones has bulged badly. While I'm replacing that one I'll do the 47uF 250V ones too. And the mains filters but I've got a stock of spares for them already. Apologies for what's probably a dumb question, but when it comes to cap replacement I know I can go up a notch if the required capacitance or voltage isn't available so 25V and 400V is ok, but what about physical size? I can get the correct capacitance/voltage but they're physically much smaller than the ones I'm replacing, like 10mm instead of 16mm diameter. If I go up to 25V I can get 16mm diameter which is the size of the old ones. Am I worrying for nothing? Cheers, from a room not filled with RIFA smoke for once :) -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?
RE: Power Supply capacitor physical size
> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Adrian > Graham > Sent: 03 September 2016 14:03 > To: Discussion: On-Topic and Off-Topic Posts > Subject: Power Supply capacitor physical size > > Hi folks, > > Looking at the PSU of my Lisa's ProFile after it died gracefully not so long back > and it obviously needs new caps since one of the 1000uF 16V ones has > bulged badly. While I'm replacing that one I'll do the 47uF 250V ones too. > And the mains filters but I've got a stock of spares for them already. > > Apologies for what's probably a dumb question, but when it comes to cap > replacement I know I can go up a notch if the required capacitance or voltage > isn't available so 25V and 400V is ok, but what about physical size? > I can get the correct capacitance/voltage but they're physically much smaller > than the ones I'm replacing, like 10mm instead of 16mm diameter. If I go up > to 25V I can get 16mm diameter which is the size of the old ones. Modern caps are physically smaller so folks who want to preserve the look of objects resort to Capacitor Stuffing.. .. put a new modern cap inside the old case... > > Am I worrying for nothing? > Personally I think that it's a valid question. > Cheers, from a room not filled with RIFA smoke for once :) > > -- > Adrian/Witchy > Binary Dinosaurs creator/curator > Www.binarydinosaurs.co.uk - the UK's biggest private home computer > collection? > Dave G4UGM
Big Apple/Atari/Commodore/TRS-80 sale today in Orange, CA
https://orangecounty.craigslist.org/gms/5763569283.html I went to this sale last week and picked up a DECmate and some Mac stuff, the amount of stuff he had was remarkable. Sale is today only. Some of the cool stuff I saw last week: - 2 x ADM-3 terminals - Quadra 950, WGS 95, WGS 9150 - 2 x Macintosh Portrait Display - lots of classic Macs, some PPC AIOs (52xx), G3/G4 iMacs - Apple Studio Display (the original blue-colored LCD) - Centris 650, beige G3s - so much other Atari/Commodore/TRS-80 stuff Brendan
Re: Power Supply capacitor physical size
On 09/03/2016 08:02 AM, Adrian Graham wrote: Hi folks, Looking at the PSU of my Lisa's ProFile after it died gracefully not so long back and it obviously needs new caps since one of the 1000uF 16V ones has bulged badly. While I'm replacing that one I'll do the 47uF 250V ones too. And the mains filters but I've got a stock of spares for them already. Apologies for what's probably a dumb question, but when it comes to cap replacement I know I can go up a notch if the required capacitance or voltage isn't available so 25V and 400V is ok, but what about physical size? I can get the correct capacitance/voltage but they're physically much smaller than the ones I'm replacing, like 10mm instead of 16mm diameter. If I go up to 25V I can get 16mm diameter which is the size of the old ones. Am I worrying for nothing? Maybe not. Capacitors that are subjected to high AC ripple current may need the large surface area for cooling. Possibly using a low-ESR capacitor will help reduce heating, but might have other undesirable effects. So, you need to know a bit about the circuit and the stresses placed on the capacitors to decide. if the ripple current is low, then smaller caps are no problem at all. Jon
Re: Power Supply capacitor physical size
> From: Jon Elson >> needs new caps since one of the 1000uF 16V ones has bulged badly. >> ... >> If I go up to 25V I can get 16mm diameter which is the size of the old >> ones. > Capacitors that are subjected to high AC ripple current may need the > large surface area for cooling. Interesting point - but in his particular case, he should be OK replacing the old 16V cap with a similar-sized modern 25V cap? Noel
Re: Power Supply capacitor physical size
On 09/03/2016 10:56 AM, Noel Chiappa wrote: > From: Jon Elson >> needs new caps since one of the 1000uF 16V ones has bulged badly. >> ... >> If I go up to 25V I can get 16mm diameter which is the size of the old >> ones. > Capacitors that are subjected to high AC ripple current may need the > large surface area for cooling. Interesting point - but in his particular case, he should be OK replacing the old 16V cap with a similar-sized modern 25V cap? Similar size - then no problem! But, some new cap types are VASTLY smaller than the caps from 40 years ago. Jon
Re: Power Supply capacitor physical size
On 03/09/2016 17:39, "Jon Elson" wrote: > On 09/03/2016 10:56 AM, Noel Chiappa wrote: >>> From: Jon Elson >> needs new caps since one of the 1000uF 16V ones has bulged badly. ... If I go up to 25V I can get 16mm diameter which is the size of the old ones. >> >>> Capacitors that are subjected to high AC ripple current may need the >>> large surface area for cooling. >> >> Interesting point - but in his particular case, he should be OK replacing the >> old 16V cap with a similar-sized modern 25V cap? >> >> > Similar size - then no problem! But, some new cap types are > VASTLY smaller than the caps from 40 years ago. Hence my question, I'll stick with the same size but higher voltage. Cheers! -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?
