A fuse is a device designed to break a circuit, usually by melting when the current exceeds a certain value. Fuses are widely used in electronic equipment, but have been replaced by circuit breakers in household wiring. In the "old days" people would sometimes replace a blown fuse with a penny, which happened to be the same size as a fuse. Was this a safe practice? Why

High-voltage power supplies are sometimes designed to have a rather large internal resistance as a safety precaution. Why is such a power supply with a large internal resistance safer than one with the same voltage, but lower internal resistance?

Can all combinations of resistors be reduced to series and parallel combinations?

Old-time Christmas tree lights had the property that, when one bulb burned out, all the lights went out. How are these lights connected, in series or in parallel? How could you rewire them to prevent all the lights from going out when one of them burned out?

For college class

Simple circuits like power supply, charger, op amps – all analog circuitry.

I was hooking my 360’s DVD drive up to my motherboard via a SATA cable– and the dvd drives SATA port totally ripped off from the PCB. The spot where it was soldered in was completely stripped down to the plastic. I need to somehow get the SATA cable wires connected to the PCB again, even if it is a permanent connection.
Luckily all of the paths on the board have thru holes I can use, but Im not sure if they can be used as solder points. I could only come up with 2 plans to get this dvd drive working again, either use the strands from a straned wire I completely stripped to try to solder each individual SATA wire to its proper path OR follow the paths to the terminal of the first component and just solder into those since it would still be the same node.
Im wondering if anyone knows any other tips/tricks that I could use that might be easier or just better in general. Im open to trying anything at this point because I dont want to have to buy a new 360 dvd drive for .
Here is a link to a page a threw together to show the damage.

http://bonesaw.kicks-ass.org/PCB.html

ok, I didn’t relize yahoo would block part of my web address. I have to reveal the black portion in 3 parts so it wont be blocked again……. here it is
a** + *s* + **s
sorry for the 50 additions

the missing connector was actually the power supply and not a SATA port like my original question stated. Its a 12 pin connector with multiple pins going to ground and some are not used.

is often referred to as the: [chip board, motherboard, integrated circuit(IC), or power supply]

Audio book is a plus, must cover all this topic.
Kirchhoff’s and Ohm’s Laws
Series Circuits
Parallel Circuits
Series and Parallel Combination
Alternating Current
Capacitive Reactance
Inductive Reactance
Resonance
Filters
Diodes
Transistors
Transistor Regulated Power Supply
Transistor Amplifiers
Differential Amplifiers
Operational Amplifiers

I want to run an electronic device that is supplied with a power supply delivering 9vAC @ 3.2 Amps. This device is the fourth in a long generation of similar devices who have used 9vAC @ 700Ma. I was told that the new device has higher output only to supply one new feature (which isn’t even installed on my device) and that using the lower current will be more than adequate to power the LCD screen and other things which are essentially the same as the older models.

Does this sound accurate to you guys?

P.S. the device is an alarm system, with only basic components, just a small circuit board, backup battery, and an LCD screen.

Thanks
The problem is that the new 3.2A transformer doesn’t support X10 technology yet, and GE may not be able to get a 3.2A transformer that is compatible with X10 through the UL approval process anytime soon.

There are transformers with 700ma available for the previous models that already have X10 compatible transformers.

I have a house full of X10 devices and want the newer alarm. Heard it would work from some alarm tech who said he has done it… but wanted to check other sources first.

I’m trying to mod my keyboard by adding back lighting. I was going to to use the scroll lock key for a switch and the LED indicatr light for the power supply. i counted 30 LED spots. I was wondering if i cud over load the circuit board on it.
im trying to add a backlight with 30 LED bulbs and i was thinking of using 1 led slot on the circuit board for the power supply. so was wondering if i cud overload or short circuit or cause any other damage to circuit board doing so

http://www.elecfree.com/electronic/wp-content/uploads/2007/11/lm555powerdelay.gif

Using either of the top two circuits, how do I make a shut off timer? I Built the second one and it works perfectly but with my design I don’t want any power flowing. So when the relay activates to shut down it’s own power supply all it will do is reset itself and turn into an oscillator, right?

How do I do this so that the power stays off.

Thanks,
Jake

http://www.elecfree.com/electronic/wp-content/uploads/2007/11/lm555powerdelay.gif

Using either of the top two circuits, how do I make a shut off timer? I Built the second one and it works perfectly but with my design I don’t want any power flowing. So when the relay activates to shut down it’s own power supply all it will do is reset itself and turn into an oscillator, right?

How do I do this so that the power stays off.

Thanks,
Jake

The resistors are all labeled with R# and it seems the capacitors are named accordingly with C#. What could a part with the labeling D2 be? it looks like a black cylinder with 2 small metal pieces holding it slightly above the board.
any help is greatly appreciated .

oh ya, and its a LCD power supply, looked for the schematic but couldn’t find it.