how to get started learning about electronics.?

my overall goal is to make electronic devices and 100% custom computers as a hobby (or a career later on) I am learning about microcontrollers such as arduino and I am learning how to program. where should I start if I want to get on track learning about electronics? i already know a little bit about what components do but not much about integrated circuits and how they play their roles. Where could i go to independently study it and what would I search for? by the way i’m in highschool.
thanks.
For clarification I wanted to know because I have an image of a motherboard design in my mind with all of the details but I don’t know how to actually get started making it.

What is the main idea of this?

Hello everyone.

I have to extract the main idea of the following text, but I’m utterly confused. Take a look:

Computers are electronic machines for processing data. Data are pieces or items of information that have been proper prepared so that the machine can work with them. Processing means handling or manipulating the material that has been presented to the machine in such ways as performing calculations, classifying information or making comparisons. A computer is made of millions of electronic devices that can store the date or switch them through complex circuits with differentes functions at incredible speeds.

The collection of devices that constitute a computer are technically known as a computer system. This system consists of functional components, or parts, for input, storage, control, processing, and output. All general-purpose computer systems has these components, but their physical characteristics may vary

The main storage, control and processing components constitute the heart of the computer system. The central processing unit (CPU) has been designed by the manufacturer to control and carry out basic instructions to that particular computer. It is here that the data processing is done. The C.P.U has two components, called the control and arithmetic units. Input and output are handled by machines that are called I/O devices.

What confuses me is that I do not see a real main idea, except for the components of a computer.
So, what do you think is the main idea? (I have to underline it)

Thanks in advance

3A fuse on furnace board keeps blowing.?

I’ve got an Amana 93HQ furnace, a Goodman CKL36-1L AC unit, and a Robertshaw (unk model) digital thermostat. All are about 2-3 years old.

Several days ago, we lost power to my house during an electrical storm. The power was off for several hours. Eventually, the utility company replaced the (ancient) transformer and restored power. I do not know what else they may have done, as I was at work when power was restored. I know a loud lightning strike woke me, but I do not see any evidence of an actual strike at the house.

Upon returning home, I found that my DSL modem, my garage door opener motor, and my digital thermostat were not functioning. All other electronic devices seem fine (TV, Wii, etc).

The modem power supply had been humming for a while, and my electrician friend said that garage door motors seem to be sensitive to the surge after a transformer hookup. Particularly if they hooked the house to the transformer, and -then- hooked the transformer to the grid. He said this seems to create issues more often than hooking the transformer to the line, and then the house to the transformer. I have no idea how things were connected, obviously.

Upon looking into the thermostat issue, I found that the 3A fuse on my furnace board was blown. Replace, blows again. With some trial and error, I found that the circuit is -fine- in the heat, or fan-only settings. It’s only when the thermostat tries to activate the AC that an issue occurs. Discussion with an HVAC acquaintance of mine led me to think it may be the contactor.

I pulled the access cover from my AC unit, and manually pushed the contactor…everything seems to work normally. Fan spins, I can hear the compressor fire up, etc. Try to activate from the thermostat, though, and the 3A fuse blows. I also pulled the low-voltage wires at the furnace board (wires which run out to contactor on AC unit). When this is done, the thermostat can be switched to "Cool" without issue. Obviously the AC unit doesn’t engage, but no fuses blow.

Ideas? Could the surge of power (after transformer replacement) have hosed the coil in the contactor? Is there a way to test this, prior to replacing the contactor? Is there a way to get 24V power to the contactor (to see if it engages) without tripping the fuse on the furnace board?

Other thoughs, suggestions, or advice?

Learning how to build electronic things?

Hi everyone, I am interested in learning how to build electronic devices such as radio controlled cars, flashing lights, anything. I would like it if anyone could post good books, tuts, online lessons, and dvds.
I want stuff that starts from the very beginning that teaches how capacitors, transistor, Integrated circuits, micro-controllers, anything of the sort, works. I know nothing about electronics and would like to learn thanks.

Can one proof read this essay?

Everyday tons of hazardous electronic waste is dumped in China and other developing countries. These wastes come from various items that we use in our everyday life; some include batteries, kitchen appliances, used computer equipment, and other worn out electronic devices. These items contain chemicals, heavy metals, dangerous pathogens, and other toxins. Many places like the U.S. or the UK have not officially banned exportation of these electronic items, and countries like China still do not enforce their rules of banning e-waste importation. China allows a city like Guiyu to collect, dissemble, and produce toxic e-waste because they are a developing country who needs the money that they receive by taking in this e-waste. Since recent booms in sales of electronic items more of this e-waste is being made, which makes it hard to enforce exportation of it; because of the rate that e-waste is filling into landfills also makes it harder to discard of it. (“Toxic Waste”)

In the city of Guiyu an environmental problem has spiraled out of control, citizens are being allowed to dismantle electronic waste (most imported) in their homes and near by workshops. In China recycling e-waste is not taken as a threat to the environment or health and safety regulations. Even though the Chinese law prohibits the importation of e-waste and Beijing is part of the Basle Agreement, (an international treaty that is banning the shipment of e-waste from developed countries to developing countries), they still import e-waste. Only in Guiyu are officials allowing this importation of e-waste, because it provides the cities residents with income; and so far China has not put a stop to it, because they are so hungry for all sorts of metals and the money that they earn for taking the metals and electronic items. (“In The ‘Toxic City of Guiyu, Children Play Among The Waste”)

Developed countries like the U.S. (which did not sign the Basle Agreement) could keep their e-waste and properly dispose of it, but the cost of doing so does not outweigh environmental and health problems that are appearing in developing countries like China. (“In The ‘Toxic City of Guiyu, Children Play Among The Waste”) Even though the U.S. has tried to put a stop to the exportation of e-waste, corporate businesses argue to congress that environment and health problems are not a big deal, and the government is being too strict. Plus the government would be taking away from earnings that they receive every year. Communities and environmentalists are still complaining about law enforcement of regulations of hazardous e-waste. (“Toxic Waste”)

The impact that e-waste is having on the wellbeing of the people in Guiyu is disastrous, and much of this could be stopped with a few e-waste regulations. “Computer carcasses line the streets, awaiting dismemberment. Circuit boards and hard drives lie in huge mounds. At thousands of workshops, laborers shred and grind plastic casings into particles, snip cables and pry chips from circuit boards. Workers pass the boards through red-hot kilns or acid baths to dissolve lead, silver and other metals from the digital detritus.” (“Chinese City Is World’s Digital Scrap Heap”)

In Guiyu, workers are dismembering various electronic items. Most of them are equipped with only small hand tools; which they use to take apart old computers, monitors, printers, DVD players, telephones, MP3 players, and other electronic objects. Several of these items come from brand named companies (like HP, LG, Apple, and Compaq) who say they recycle their products. Workers that are unaware of these toxins tear apart each piece of electronic items to its smallest components, and melt the items in open fires to extract metals. Others take the remaining pieces of scrap metals and dump them in water ways. (“Toxic Tea Party”)

All of this e-waste has an effect on the environment in Guiyu. “Water sources are black and pungent and choked with industrial waste, says Kevin Brigden. Brigden (Greenpeace Research Laboratories) tested streams in Guiyu and found out that acid was leaking into them. The streams had soaring levels of toxic heavy metals, which were powerful enough to disintegrate a penny in a few hours.” (Toxic Tea Party”) In Guiyu the price of water is ten times more than in other surrounding places. Water is usually brought to the people of the city by truck, because the streams are so heavily polluted that it turns a dark black color in seconds. (“Toxic Tea Party”) Local bosses pay little regard to workers’ health or regulations that prohibit dumping acid baths into rivers.

The e-waste has had a negative effect on the health of the people that live around it. This e-waste can harm humans and animals if they encounter these toxins. Some toxins persist in the environment and accumulate; humans or animals often absorb them. Organizations say that dangerous levels of the metals found in Guiyu have negative effects on children. (“Toxic Waste”) A group found "Over 10 poisonous metals, such as lead, mercury and cadmium, in Guiyu” said Lai Yun, a campaigner. (“Chinese City Is World’s Digital Scrap Heap”) “Professor Hun Xia (Shantou University Medical College) tested 165 children for concentrations of lead in their blood. Eighty two percent of Guiyu children had blood/ lead levels of more than 100. Anything above that figure is considered unsafe by health experts. The average reading for these children was 149” (“Toxic Tea Party”)
These high levels of lead in adults and children can lead to lower IQ’s and the development of the central nervous system. It also can cause headaches, nausea, miscarriages, and skin damage. Many of these symptoms that these people are having have not been treated properly, and the peasants do not understand what damage e-waste does to them. Clearly people suffer but that does not mean that they get paid good wages, on average workers earn about 200 to 300 yuan (US$ 24-US) per month in Guiyu. (“Toxic Tea Party”)
Some 60,000 laborers toil in Guiyu for e-waste recycling, even as the work imperils their health. “About 2.3 million PCs, 2.7 millions computer displays and 1.35 million printers were dumped in 2002.” (“In The ‘Toxic City’ Of Guiyu, Children Play Among The Waste”) Environmentalists say in Guiyu alone, one million tons of e-waste has been treated each year. Despite all the toxins that come from e-waste, its business provides Guiyu’s locals with a more profitable living. Many residents have had better opportunities since they started recycling e-waste. City officials are proud of the e-waste industry but sensitive about its reputation as a dirty business that feeds off smuggled waste and abuses labor rights. Visitors quickly find themselves detained by the local police officers, and their video or digital photographs erased. (“Toxic Tea Party”)

In Guiyu most discarded computers and electronic devices from all over the world often end up there, this may be why it’s the e-waste capital of the world. Some developed countries have banned exportation of e-waste, but even if e-waste exports stopped Guiyu recycling would not stop; because China is generating more of its own e-waste. While we may consider the environmental and health problems that e-waste poses for people there, citizens in Guiyu do no think this way; because doing this work is their way of life. Conditions in Guiyu have changed little despite the efforts of the central government to crack down and enforce the long-standing e-waste import ban. The developed countries need to stop exporting e-waste to poorer developing countries; and the U.S. needs to reduce the toxicity and amount of e-waste that is being dumped there every year. (“Toxic Villages”)
I do have a works cited page!

How could electric eel makes an electric shock?

How is that possible? I read in wikipedia and they say it's about 650 volts! And that means fishes are a step ahead us because they have known and controlled electricity much longer than human being! (haha)

By the way, back to the topic. I just don't understand how it works, because they swim on water but they don't get a "short circuit" (you know what I mean, imagine if you soak electronic devices on water) and they can "turn" the electricity on everytime they want.

Another stupid question, if 1 electric eel could make 650 volts, could we use that energy? Like take a lot of electric eels and put them together in a bucket and then make them angry so they make electricity and we use that energy?

Stupid question number 2, what happens if we juice 'em with electricity? Are they gonna die?

Sorry for the stupid questions, I'm just curious, thanks!

N.B. : I would really appreciate it if someone could explain it in simple english and without scientifical term because I'm not a scientist and I easily could get lost in a hard explanation.

Thanks again!

What is Q point in Electronic Devices & Circuits?

Electronic Devices & circuits

Define these science terms?

Define

• Electronic devices-

• Electronic appliances-

• Cathode-ray tubes -

• Vacuum tubes-

• Integrated Circuits-

computer and electronics engineers plz….?

hello and thank you for looking into this question.
actually i had some plans for my future career. Currently i am doing Bachelor's of Computer Engineering. At different sites CE is defined as Engineer who's focus is less on Power electronics.
Keeping this definition in mind I thought after BCE i can go for Masters in Mircroelectronics and do the same job as Electronics engineers do (designing electronic circuits and electronic devices such as chips and transistor etc.).
I just need some guidance from you guys. Do you seem to find any thing wrong with my plan for future. is it ok for me to go for masters in microelectronics? or should i go for masters in electronics engineering? which one do you find better.

thanks alot

What I am asking is;
I have old electronic devices and I want to replace the guts with newer parts. for example; big resistor with a smaller modern equivalent. a flash tube with whatever will do the same thing.
so… where can I find information on how to find the modern equivalents of the old electronics? How do you know what to replace the part with?
for example; will a 1/4W 10K resistor from radio shack really work to replace a resistor that is rated the same but is three times bigger or does it only work in theory?

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