Digest for sci.electronics.repair@googlegroups.com - 11 updates in 6 topics

avagadro7@gmail.com: Aug 30 06:40AM -0700

On Monday, August 29, 2016 at 12:30:22 AM UTC-4, whit3rd wrote:
 
> Most auto manufacturers wire power and speakers to a proprietary connector.
> Different for Ford, Chrysler, etc... but auto sound shops can get a
> harness for any make or model.
 
I'm burned out on harnessing: direct wire to batt n ground. the connectors are for removing the unit for parking in high crime areas eg trailheads, boat ramps, suburban Chicago, California, Oregon .....
Micky <NONONObobbyburns1111@gmail.com>: Aug 29 02:23PM -0400

On Mon, 29 Aug 2016 09:48:54 -0400, Micky
 
>What should I do now? I measured again and both sides had 31.2
 
Mostly never mind. Dave, you weren't here in my crisis, so I went
ahead without you.
 
;-)
 
That is, I installed it anyhow. I tried to do it before it got sun
got bright and hot, but I'd forgotten to glue the 'gasket' to the
front**.
 
And I had to let the glue dry and it took a few minutes to solder the
cut wire.
 
I only played it a couple minutes with talk and it sounded okay. Too
hot to go for a drive; this evening.
 
Could it have read low ohms because the voice coil moved from the
center and touched something on the side the hole? It's been decades
since I tore apart a speaker, but I think it was metal on both sides
of the coil.
 
Or if the ohms are high, 31 instead of 7 or 4, how come they're both
the same amount of high, now?
 
** (It doesn't do anything much, because the speaker doesn't touch
anything in front of it, but maybe it will help keep the foam from
detaching, and I don't know where else to put the gasket ring.)
 
 
avagadro7@gmail.com: Aug 30 06:37AM -0700

if speaker ohms doahn match amp ohms then the mismatch will blow the amps output circuit ....
 
speakers are cheap.
 
read:
 
https://www.google.com/#q=bcae+speaker+wriring
 
glue is not glue....glue is ADHESIVES search: adhesives...there's a sheet.
"Ron D." <Ron.Dozier@gmail.com>: Aug 29 10:23PM -0700

On Monday, August 29, 2016 at 12:13:42 AM UTC-4, Micky wrote:
 
> My mother had a '65 Plymouth Fury II with an aftermarket AC. I think
> it worked pretty well. Not all the vents of factory AC, I think, but
> it wasn't so hot back then.
 
That too.
 
Sorry about the ice expansion thing: Yep the volume of ice is larger than the volume of water used to create the ice.
avagadro7@gmail.com: Aug 30 06:30AM -0700

On Tuesday, August 30, 2016 at 1:23:27 AM UTC-4, Ron D. wrote:
> > it wasn't so hot back then.
 
> That too.
 
> Sorry about the ice expansion thing: Yep the volume of ice is larger than the volume of water used to create the ice.
 
water volume changes, weak bonding are foundations of life on earth ....
"Michael A. Terrell" <mike.terrell@earthlink.net>: Aug 29 08:43PM -0400

> sorta in the market for one of those 1090 ohm jobs but the ones
> I see are a little to high for something that might get used once
> a year.
 
 
The self contain HV probes are easy to change polarity. Either
reverse the meter leads, or connect a small bridge rectifier between the
meter and the probe and ground lead.
 
 
--
Subject: Spelling Lesson
 
The last four letters in American.........I Can
The last four letters in Republican.......I Can
The last four letters in Democrats.........Rats
 
End of lesson. Test to follow in November, 2016
 
Remember, November is to be set aside as rodent extermination month.
jurb6006@gmail.com: Aug 29 08:01PM -0700

>"The self contain HV probes are easy to change polarity. Either
>reverse the meter leads, or connect a small bridge rectifier between >the
>meter and the probe and ground lead. "
 
Not so fast. These things had a current detect function for the horizontal output TUBE (vale for those overseas). Now if you put a DPDT switch there and reverse the meter coil polarity that would work.
 
However, a bridge rectifier would introduce error, and that error would be greater at lower voltages. Many meter movement barely need a volt but a standard diode drops .6 of that. At scope cathode voltages which might only be like 2 KV or less, this is significant.
 
We now have a Keithley HV probe but acn't really use it. Dude found a good deal on it, but it has a 350 meg output resistance which means you need an electrometer to use it. A regular VTVM will not work without alot of math, and even then... We do have one meter is would work on and it is seriously aged. (two syllables there, really) Actually it agrees with the best of the Flukes we got, but nobody is going to do the NIST routine on it and certify it.
 
I have seriously considered building one, but not with 1090 megs. The meter is 10 megohm, so 90 megs gives it enough range to measure scope CRT voltages. We are sort of committeds to repairing and restoring CROs. I do not like DSOs, let alone LCD based scopes. I believe that every electronics class in highschool should have a CRO for the kids to play with, once they know enough to not fuck it up of course. I also think they should not graduate without certain other knowledge, like the different types of firearms ad how to at least unload them and make sure there is not one in the chamber. If we are going to have guns here, dammit, make sure people know how to be safe with them.
 
They should know how to change a tire on the care, some at least simple mechanics. How many times has someone called on a neighbor or whatever to do one of the simplest of tasks claiming that are "not mechanically inclined" ? We put a Man on the moon and now we are down to this ? No wonder conspiracy theorists think it was fake.
 
But I can tell you the moonshot was real. Not that I was there but it is not hard to figure out. This was a milestone in human history, a worldwide event. There were Russian kids with telescopes all over the place and it was during the cold war. If ANY ONE of them caught even one little piece of evidence that it was faked they would be rich and the USSR would have never let us live it down. And if you really think about it, and I mean really, it would have cost more to fake it than to actually do it. Plus they really did want to do it.
 
But I have digressed quite a bit. As I look at my old 561A Tek that was built before I was born with dual trace and dual time base, sometimes I wonder just how far we have come. They have minuturized things and packed more transistor and other devices into one case, but what have they really done ?
 
When I was young my Uncle gave me the basic books from the air force. Whatever branch of the US military you serve(d) in, if it was the air force you usually had the least risk and got the best jobs when you got out. At least back then.
 
But those books said there are only three electronic circuits, rectifier, amplifier and oscillator. And every circuit to this day you see can be described as one of those. It might be gated or controlled, fancied up in all kinds of ways but it is still the same thing. Consider the function, a computer gate can be considered rectifiers feeding an amplifier.
 
But anyway, I am probably boring the OP (et al) so it is time to stop.
 
To the OP, do you got 15 volts ? Do you got 130 volts ? Before tearing into the HV shit that doesn't like to be touched, make sure you got everything else.
"Michael A. Terrell" <mike.terrell@earthlink.net>: Aug 30 07:56AM -0400

>> meter and the probe and ground lead. "
 
> Not so fast. These things had a current detect function for the horizontal output TUBE (valve for those overseas). Now if you put a DPDT switch there and reverse the meter coil polarity that would work.
 
> However, a bridge rectifier would introduce error, and that error would be greater at lower voltages. Many meter movement barely need a volt but a standard diode drops .6 of that. At scope cathode voltages which might only be like 2 KV or less, this is significant.
 
Not all of them have a current function. The bridge rectifier would
introduce a little over 1 volt error. There is a shunt in the ones that
monitor cathode current for the horizontal output. You have no need for
hat in a scope repair. The reason I wouldn't use the switch is that
there isn't enough wetting current, so after a few years it can start
arcing. Even at low current, you don't want to create plasma. Calculate
the current, through the resistor for the full scale range. It is quite
low to keep from loading the HV supply and affecting the reading.
 
 
--
Subject: Spelling Lesson
 
The last four letters in American.........I Can
The last four letters in Republican.......I Can
The last four letters in Democrats.........Rats
 
End of lesson. Test to follow in November, 2016
 
Remember, November is to be set aside as rodent extermination month.
"Michael A. Terrell" <mike.terrell@earthlink.net>: Aug 29 07:28PM -0400

>> " Do you really think that the spammer comes back to look for >replies?"
 
> He even said he doesn't. Some people are so stupid, how do they even live ? Someone must be there to remind them to breathe.
 
 
 
Far left Liberals! What else can you expect from them? :(
 
 
--
Subject: Spelling Lesson
 
The last four letters in American.........I Can
The last four letters in Republican.......I Can
The last four letters in Democrats.........Rats
 
End of lesson. Test to follow in November, 2016
 
Remember, November is to be set aside as rodent extermination month.
jurb6006@gmail.com: Aug 29 05:55PM -0700

Don't tell me actually found some common ground.
 
Really, some liberals did some good things, but they are out of hand, and I am thinking possibly out of touch with reality. I think in the old days if you asked them "How are you going to pay for that ?" they might say "Tax and borrow". Now I think you'll just get a blank stare, like a deer being spotlighted.
 
I actually liked Bernie Sanders, he is a socialist liberal but he is a non-interventionist and plus he is not an Israel firster unlike Clinton, despite the fact that he is Jewish. But the party didn't like him and it really looks like there is going to be a President Trump next year.
 
But what people do not understand is that we are not electing a dictator. The President can do two things other than sign or veto what congress sends him. One is to start a war. The other is to issue executive orders and while they are rarely challenged they can be struck down by the judiciary branch of the government. If I remember correctly it has only happened a couple of times but I think of the choices we have now it might just start happening more. The other problem is the appointments to the supreme court, but they have to be confirmed by congress which means neither Alan Sharpton or David Duke is getting in.
 
People better pay attention to this congressional race. Many seats up for grabs. Those people are what keeps the President from being a dictator. I think if you have a republican President you need a democrat congress, and vice versa. But if Trump gets in it doesn't matter because neither party wants him in. Actually, that is a big part of the reason I want to see him get in. It would be like a kick in the balls to both parties. Teach them who's boss. The people who ruin the political parties were not elected, and the ones who run the media are not elected. They have no business having so much power.
 
I fuck with the Brits sometimes like - give up your guns and pay your telly tax, and that is a point. But the telly tax in Britain goes to fund a Citizen's oversight committee which evaluates the quality of their news outlets. As such the BBS is one of the most respected and trusted news outlets in the world. Meantime, Fuck Snooze goes to court to get the right to outright lie on the air with impunity, AND WINS.
 
What does that mean ? That means if they know a severe thunderstorm is coming and decide to lie and you go out and get a cookout started and ten people get hit by lightning they have zero legal culpability. Even if it kills someone. How the court could ever issue that judgement in good conscience is beyond me. How do they sleep at night ?
 
If we are going to change this country for the better we need Citizens oversight groups for the government, the cops and the media. No more cop shoots n____r and gets a paid vacation, he goes to jail under investigation. We needed that with Carl Stokes, one of the biggest crooks in Cleveland history, but it is politically incorrect to say that because he is Black. We The People need the right to call them on the carpet for the shit they do.
 
It is ridiculous,they allow the sale of prescription drugs (even for smoking cessation) that make people suicidal and some to shoot up schools and even army bases, while putting people in prison for selling pot that grows in the ground ? What is wrong with this picture ?
 
I have thought about it and the answer is because to those MFs it is all about money. We got judges who invest in companies that run private prisons. We got industry insiders on the boards of the USDA and FDA, and look at all the class action lawsuits.
 
Do other countries have that ? they do not have a Constitution like ours but they do get a response when they petition or get out and demonstrate. Britains got Brexit on the ballot, China changed some plans because people demonstrated in the streets. Now what was their response to OWS here ? Free country my fucking ass. That was pretty big and not a fucking thing changed.
 
I am sorry you fought for this country because they are wrecking it as fast as they can. If your physical maladies are due to your service I am even sorrier. I don't know your age, but if you are old now you pretty much fought for a different country than it is today.
mhooker32@gmail.com: Aug 29 10:03AM -0700

> > whatever signals it outputs, rather than looking at EDID data the way a
> > PC would.
 
> will that affect what i'm trying to do?
 
i made up the cable as per jeff's chart, and the lcd monitor displayed a very nice image. now i can go thru the machine and test all its functions. with the image on the original monitor as described above, do you think a cap kit will do the trick?
 
thanks
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