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Windows 7: Quiz on capacitors

14 Jul 2014   #51
ICIT2LOL

Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10
 
 

Hmm might just try that Jeannie I have quite a few speakers hooked up to that system (some I made up myself) so losing some of the bass would not bother me too much and as I live on five acres on the edge of a small town neighbours are not a problem

But as you say working out where the hum is coming from is probably best found and eradicated.
My System SpecsSystem Spec
14 Jul 2014   #52
poorguy

windows 7 pro 32bit
 
 

good morning to all, a lot of post since I have slept.

ICit2lol, I would 1st check my wall electric receptacle for proper grounding and polarity hot to hot and neutral to neutral. then make sure that your 2 wire power cords are polarized properly again hot to hot and neutral to neutral. try connecting without surge protector to eliminate that it is not the problem. from there I would connect each component up by itself to eliminate each component is not at fault. from there I would check all of my audio input and output cables and cable tv coax to eliminate them. I have found that bad cables can cause noise issues. if none of this works then you might have an issue in one of your pieces of audio/video devices. I have also seen cable tv coax create ground loops that can produce hum between audio and video components. depending on how old you components are it is possible to have a leaky electrolytic causing this hum. hard to say without being where you are having this problem. as Lady Fitzgerald said earlier grounds and neutrals are connected together for noise suppression through coupling capacitors and that could also be an issue if the cap went bad not real likely but possible.

will get back with you guys later I am going to the doctor to get some blood taken.
see you guys in a little bit.
damn interesting conversation we have going on here.
if this thread gets moved let me know some how.
poorguy
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14 Jul 2014   #53
strollin

W10 Pro desktop, W10 laptop, W10 laptop, W10 Pro tablet (all 64-bit)
 
 

A little story regarding only using 1 hand when working with electricity.

When I was attending electronics school in the army in 1972, we would be asked to "test" each other by going to a rack of comm equipment and "messing it up" then the other guy would need to correct everything and get the comm equipment back on-line. My favorite thing to do was to disconnect the braided grounding straps that connected adjacent racks together to keep their grounds from floating. I would then chuckle when watching my fellow classmates attempt to reconnect the ground strap. They'd grab the strap attached to rack 1 in left hand, then grab the wing nut on rack 2 to connect the strap but immediately jump back complaining of being shocked. I would then grab strap attached to rack 1 in left hand, touch it to the wing nut on rack 2 then use right hand to tighten wing nut. After that I would use right hand to loosen wing nut then left hand to remove strap. My classmate would then repeat the left hand on strap, right hand on wing nut, shock procedure. Some would not ever pick up what I was doing from observing me and I would have to explain it to them, otherwise they would think that I was simply immune to the shock.
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.

14 Jul 2014   #54
ICIT2LOL

Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10
 
 

Quote   Quote: Originally Posted by poorguy View Post
good morning to all, a lot of post since I have slept.

ICit2lol, I would 1st check my wall electric receptacle for proper grounding and polarity hot to hot and neutral to neutral. then make sure that your 2 wire power cords are polarized properly again hot to hot and neutral to neutral. try connecting without surge protector to eliminate that it is not the problem. from there I would connect each component up by itself to eliminate each component is not at fault. from there I would check all of my audio input and output cables and cable tv coax to eliminate them. I have found that bad cables can cause noise issues. if none of this works then you might have an issue in one of your pieces of audio/video devices. I have also seen cable tv coax create ground loops that can produce hum between audio and video components. depending on how old you components are it is possible to have a leaky electrolytic causing this hum. hard to say without being where you are having this problem. as Lady Fitzgerald said earlier grounds and neutrals are connected together for noise suppression through coupling capacitors and that could also be an issue if the cap went bad not real likely but possible.

will get back with you guys later I am going to the doctor to get some blood taken.
see you guys in a little bit.
damn interesting conversation we have going on here.
if this thread gets moved let me know some how.
poorguy
Right had not thought of the TV coax cable mate and I did check out the earthing on the power sockets and even went to the length of shoving a metal rod into the ground outside and passing the wire back inside and hook it in but that did nothing.
I am guessing now it may well be the age of the stereo as it was purchased in1984 although it was costly at the time it could well be gone.
My System SpecsSystem Spec
14 Jul 2014   #55
poorguy

windows 7 pro 32bit
 
 

ok I am back from the doctor.

good story strollin also very true grounding is very important on any piece of energized electrical equipment. speak from hard hitting experience.

ICit2lol, the age of your amp could be a factor. I own a lot of old electronic stuff and have had to work on most of it because it is old. hell I have recapped my tube test instruments all of them. they are 20 to 40 years old, parts go bad. instead of using a grounding rod in the earth take the ground to your electric panel grounding bus bar see if that makes any change.

Lady Fitzgerold, playing with oscilloscopes is fun. I own quite a few of them and connect multiple signal generators to and make all kinds of waveshapes. real bummer no one to help out with the color code, you sound as though you know your way around in this field.

have a great day folks, I am going to work now.

poorguy
My System SpecsSystem Spec
14 Jul 2014   #56
Indianatone

Windows 7 x64 Ultimate and numerous virtual machines
 
 

I did the same as you guys. Went to the TV shop when I was 13 or 14 and asked them if I could help myself to some of the TV sets they threw away. Used to get some of them going and watch them. At the time (early 70's) colour TV had started in our area from the 1 megawatt Sandy Heath transmitter so everyone was throwing out there old B&W TV's. Learnt all about them from books and fixing them and got a job fixing TV's at a rental TV chain. Refurbishing colour TV's and mono sets both with valves (tubes) and all transistor. Some sets had the first IC's available to TV manufacturers and also mechanical tuners that covered only the UHF band in some budget sets. The better sets had varicap diodes in the tuners. The old 405 VHF system was finally shut down in 85 and no one noticed apart from an old dear in London with a Philips TV that was 40 years old and Philips gave her a new colour TV and placed her set in a museum. Oh the stuff we fixed in those days, the sets would break down 3 or 4 times a year.

Jonz Old Telly Page

Television History - The First 75 Years

Some of you may find these links of interest
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14 Jul 2014   #57
Ranger4

Windows 7 Home Premium 64 bit sp1
 
 

Quote   Quote: Originally Posted by ICit2lol View Post
Hmm might just try that Jeannie I have quite a few speakers hooked up to that system (some I made up myself) so losing some of the bass would not bother me too much and as I live on five acres on the edge of a small town neighbours are not a problem

But as you say working out where the hum is coming from is probably best found and eradicated.
Over the years I have spent a lot of time & money on audio equipment & I have found that hum problems are often caused by earth loops between pieces of equipment.
If they are connected by RCA plugs, you can sometimes just ease the plug out so it's still connected on the centre pin but the earth is open, which may be worth trying on each piece of equipment after disconnecting all the other ones. In other words a process of elimination.
My System SpecsSystem Spec
14 Jul 2014   #58
A Guy

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x64 SP1
 
 

I fix TVs every day. We just swap out boards these days. Changing caps in power supplies is the only component level repair we do these days. And those are few and far between. A Guy
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15 Jul 2014   #59
poorguy

windows 7 pro 32bit
 
 

hey all, yeah the last tv shop I worked at we could still do component level repair and most of those were cold solder joints on the high voltage transformer or horizontal output transistor. the printed circuit boards were so flimsy and cheaply made that they created their own problems over a short time.

I am pretty fortunate to work part time at a music store that repairs amplifiers tube and transistor. I am 1 of the 2 techs that are there and I only get the tube amp repair because the other tech doesn't know enough about tubes to troubleshoot them. he is however sharp as hell on the new modern amps and such he just never learned anything about tubes. but still there really isn't enough work to keep both of us there 40 hours a week so part time is good. I'm old.

yeah I remember the old tv repair shop days we would get peoples old tv sets and repair them and sell them used on the floor and most of them were better then the newer sets. old electronics was designed to be repaired and it was made to last. that is why I like working on the old farm tube radios and the old table top tube radios.

have a good day.
poorguy
My System SpecsSystem Spec
15 Jul 2014   #60
NoN

Windows 7 Professional SP1 - x64 [Non-UEFI Boot]
 
 

Was too early this morning when answered the quizz so got caught by some (radio, farads)...

Meanwhile, last year i bookmarked for my knowledge the Capacitor Lab page which could be always handy when your board ran out of its warranty, since we're almost concerned by electronics devices involving computing hardwares.
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