- Resistor colours - 14 Updates
- More EPROM stuff - 1 Update
- Robbins&Myers wiring diagram Kl167 1/2hp - 1 Update
| tabbypurr@gmail.com: Dec 11 12:10PM -0800 On Wednesday, 11 December 2019 15:33:48 UTC, Ralph Mowery wrote: > 10% range. Some not much , some are around 30% off. Hard to believe > that some could change so much while never used and only a few inches > away in the same package. Think about the construction, I'm not surprised the high R ones tend to drift high NT |
| John Robertson <spam@flippers.com>: Dec 11 12:24PM -0800 > It is not random. > Peter Wieck > Melrose Park, PA And if you are colour blind or deficient it is not information that we can see... Not picking a fight (I like your posts), just saying colour doesn't work for all of us here! John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
| Ralph Mowery <rmowery28146@earthlink.net>: Dec 11 03:45PM -0500 In article <802a7db3-cf40-4a1f-b9db-947f24855ec8@googlegroups.com>, tabbypurr@gmail.com says... > Think about the construction, I'm not surprised the high R ones tend to drift high I have found some in the 470 ohm and a few in the 100 and under ohm range have changed values more than the 10% they are rated for. Those were new ones in the 25 pack. They were checked with a Fluke 87 that had been sent out about 6 months before to a lab that verified it to the NIST to be in caliberation. |
| Trevor Wilson <trevor@rageaudio.com.au>: Dec 12 08:58AM +1100 On 11/12/2019 9:30 am, John Robertson wrote: > so green and brown can look the same at the best of times... I use an > ohmmeter to verify as I can't trust my colour vision. > John :-#)# **The very first test I had to pass, before entering the electronics biz, was a colour blind test. -- Trevor Wilson www.rageaudio.com.au |
| Ralph Mowery <rmowery28146@earthlink.net>: Dec 11 06:10PM -0500 In article <h5d73nFmmc7U1@mid.individual.net>, trevor@rageaudio.com.au says... > **The very first test I had to pass, before entering the electronics > biz, was a colour blind test. As most electronics have now gone to the SMD the color code is not worth too much. Most of the SMD resistors I have seen are marked as to resistance. However the SMD capacitors have no markings at all. Sort of backwards to me. Almost everyone will have a meter that can measure resistance, but maybe not the capacitors at hand. |
| Trevor Wilson <trevor@rageaudio.com.au>: Dec 12 12:21PM +1100 On 12/12/2019 10:10 am, Ralph Mowery wrote: > However the SMD capacitors have no markings at all. Sort of backwards to > me. Almost everyone will have a meter that can measure resistance, but > maybe not the capacitors at hand. **True enough now. I started in 1971. Digital meters were the realm of seriously cashed laboratories only. Even then, NIXIE tubes ruled. -- Trevor Wilson www.rageaudio.com.au |
| Michael Terrell <terrell.michael.a@gmail.com>: Dec 11 06:50PM -0800 On Wednesday, December 11, 2019 at 8:21:29 PM UTC-5, Trevor Wilson wrote: > > maybe not the capacitors at hand. > **True enough now. I started in 1971. Digital meters were the realm of > seriously cashed laboratories only. Even then, NIXIE tubes ruled. The first one that I saw was Non Linear Systems, in the late '60s. It had just been purchased by the local steel mill for their research center. One of their engineers brought it to our high school Electronics class to show it to us. It used an electro mechanical display that was slow to update. I wasn't impressed. https://stevenjohnson.com/nls/index.htm is an example. |
| John Robertson <spam@flippers.com>: Dec 11 11:34PM -0800 On 2019/12/11 6:50 p.m., Michael Terrell wrote: >> seriously cashed laboratories only. Even then, NIXIE tubes ruled. > The first one that I saw was Non Linear Systems, in the late '60s. It had just been purchased by the local steel mill for their research center. One of their engineers brought it to our high school Electronics class to show it to us. It used an electro mechanical display that was slow to update. I wasn't impressed. > https://stevenjohnson.com/nls/index.htm is an example. Sounds like telephone steppers running the display tubes - one stepper per tube... The same sort of display and stepper was used in some 1960s arcade games - Nutting's COMPUTER QUIZ was one of them. Here is a video I did of that machine from a year or two ago: https://www.youtube.com/watch?v=zr98ASLdbZQ I didn't go into the scoring with the Nixie tubes and the telephone steppers in that video, should do that if I make another... John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
| Trevor Wilson <trevor@rageaudio.com.au>: Dec 12 07:09PM +1100 On 12/12/2019 1:50 pm, Michael Terrell wrote: >> seriously cashed laboratories only. Even then, NIXIE tubes ruled. > The first one that I saw was Non Linear Systems, in the late '60s. It had just been purchased by the local steel mill for their research center. One of their engineers brought it to our high school Electronics class to show it to us. It used an electro mechanical display that was slow to update. I wasn't impressed. > https://stevenjohnson.com/nls/index.htm is an example. **Cool. I learned my craft as a trainee with an Aussie quasi-government agency called The Overseas Telecomunications Commission. They were responsible for all communications in and out of Australia. That included satellite, cable and, HF radio They had so many cool toys, including: * An entire floor dedicated to a large mainframe. Which included a 2 Metre long computer drum drive. * The very first ink jet printer I had ever seen (1972-ish). As I recall, the ink was accelerated to the paper via a 2.5kV potential difference. The printer was VERY slow and the print quality was appalling. Cost over 2.5 Grand, if I recall. * Huge page printers, churning out print at quite respectable speeds. * A thing called T.A.S.I. Time Allocation, Speech Interpolation. Multiple racks of tubed equipment, which examined the incoming and outgoing voice comms and shuffled bits of voice into quiet parts of different conversations. Bandwidth of the cable was doubled. Astonishing technology. * A HUGE 2.5kV power supply for the tube cable repeaters between Sydney and New Zealand. VERY reliable tubes were chosen (obviously, as repair was expensive). * A massive (600mm X 600mm X 600mm frequency counter, using tubes and NIXIE tubes as readouts. Something like 10 digits. * A huge battery room, full of Pyrex™ glass lead/acid batteries. The room also had four, 2 Metre high CO2 cylinders and a 2 Tonne fire door. We were told that, if there was a fire, run like Hell and, if the door closed, climb onto the Diesel generator (about 2 Metres high) and hope the CO2 doesn't suffocate us. Prolly and urban myth to scare trainees. -- Trevor Wilson www.rageaudio.com.au |
| "pfjw@aol.com" <peterwieck33@gmail.com>: Dec 12 03:44AM -0800 No fight perceived. Just attempting to point out to the OP and other speculators that these colors are not by accident, and in some cases convey critical information, such as fusible and/or flameproof resistors, not to be replaced with standard types. In any case, enjoy your holidays! Peter Wieck Melrose Park, PA |
| Michael Terrell <terrell.michael.a@gmail.com>: Dec 12 04:52AM -0800 On Thursday, December 12, 2019 at 3:09:55 AM UTC-5, Trevor Wilson wrote: > We were told that, if there was a fire, run like Hell and, if the door > closed, climb onto the Diesel generator (about 2 Metres high) and hope > the CO2 doesn't suffocate us. Prolly and urban myth to scare trainees. I used the 'White Alice Network', back in the early '70s. It was built during WW-II as the first, Over the Horizon, Microwave telephone system to connect the various military bases in Alaska. It used huge dishes, and the refraction of mountain peaks to get their signals over the various mountains. The audio was remarkably clear, for telephone service, considering it was almost 30 years old. Our telephone, teletype and radio network feeds were delivered by this system. A lot of people died, building it but it made more sense than trying to build thousands of miles of lead covered aerial cable, or even worse, burying it in a region that varied from below -40F, to +80F during the year. The last traces of the old sites are mostly gone now, but there are websites dedicated to its history. It took dedicated and rugged engineers and technicians to build and maintain a huge system, like this. I used it from what had been 'Delta Field' in WW-II. It was one of the major transfer sites for the Lend-Lease program, where Russian pilots picked American built aircraft and weapons to fight Germany from the Russian Front. The building I worked at had been the pilot's mess hall, barracks and the original boiler plant for the airfield. Considering the age and severe weather conditions, I don't recall a time that it ever gave us problems, other that high audio loss on dedicated audio feeds. It was never designed to handle a Network radio feed, and it was around -20dB depending on the time of year. That wasn't unexpected, on 30 year old Arial lead cable. I had a spare mag phone preamp on hand, so I added it to the feed, to bring it up to the required level. The station was AM, and played mostly Rock, so no one complained about the bad equalization. :) Prior to that modification, it was a sight to watch the DJ switch from Network to local feed. The levels had to be reset at three points, in just a couple seconds, and they were all on different racks. They loved just flipping a switch, instead. |
| Michael Terrell <terrell.michael.a@gmail.com>: Dec 12 04:59AM -0800 > No fight perceived. Just attempting to point out to the OP and other speculators that these colors are not by accident, and in some cases convey critical information, such as fusible and/or flameproof resistors, not to be replaced with standard types. Peter, Ii can remember when those Flameproof resistors first went into use. Some consumer equipment had notices to use them for repairs, instead of the Carbon Comp. Others had warnings to only replace them with Flameproof, but as usual most of the hacks ignored the OEMs, because the resistors cost more, and weren't as well stocked by the wholesalers. These were the same losers who refused to properly hand MOSFETs and static sensitive ICs. I got tired of hearing, 'If they can't make good parts, let them go out of business.' If it were up to them TVs would still be all tube. |
| Stephen Wolstenholme <steve@easynn.com>: Dec 12 02:14PM On Thu, 12 Dec 2019 04:59:11 -0800 (PST), Michael Terrell >'If they can't make good parts, let them go out of business.' That's what my first company was often told. The "power" resistors were white with the value printed on them in black. After some exchange of messages I discovered that of our main customer wanted green rather than white. We started encapsulating the resistors in a ceramic that was green. Then we got complaints that black writing on green was difficult to read. So far as I know the company is now using imported components! Steve -- http://www.npsnn.com |
| Michael Terrell <terrell.michael.a@gmail.com>: Dec 12 08:07AM -0800 On Thursday, December 12, 2019 at 9:14:21 AM UTC-5, Stephen Wolstenholme wrote: > ceramic that was green. Then we got complaints that black writing on > green was difficult to read. So far as I know the company is now using > imported components! Some want odd combinations as a cheap trademark, or to make it impossible to repair something without leaving any evidence. They could have dyed the bare white ceramic any color they wanted, or do like Western Electric did, and manufacture their own. Many US suppliers are gone, because their customers didn't want to pay for quality. Sprague was one of them. OEMs could get parts that barely lasted through the warranty for half what a long life US made capacitor cost when they closed their plant near Orlando. Now, it is a division of Vishay along with other well known American brand names. BTW, I hate light green signs with white printed text. Over time, the green fades, and the white discolors or is covered by mold that grows on the paint. |
| Chris Jones <lugnut808@spam.yahoo.com>: Dec 12 11:24PM +1100 > test the copies and if they work I'll keep the originals in a safe > place and just use the copies. > Eric My only piece of advice: Always double check the orientation of the chip in the socket when you are putting it into the machine. It is very frustrating to see through the window the brief incandescence from the melting VDD bondwire. |
| steve <f6ceedb9c75b52f7fcc0a55cf0cfbf5d_1159@example.com>: Dec 12 04:37AM Hello i Have a Robbins Frame KL 167 1/2hp 1725 115/230 serial # MM15621 any body have wiring Diagram ? is it supposed to have a run capacitor , ? thanks steve -- |
| You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com. |
No Response to "Digest for sci.electronics.repair@googlegroups.com - 16 updates in 3 topics"
Post a Comment