Sam

All ADC have to sample and quantize. If I sample first, then quantize, will I get a different output than if I quantize, then sample?

I need help finding the datasheet for this SCR (picture below). The number on it is 70210 522940-1 Y11. I can't find anything with Google. Is there a database of these types of parts? Maybe the company who makes them? Thanks.

http://i47.tinypic.com/1qpid0.jpg

I recently purchased this circuit breaker:

http://www.goldmine-elec-products.com/prodinfo.asp...

I was using it with DC and it tripped around 15 amps. I figure it would probably trip around 2.5 amps AC since that's what it says on the website and on the device. Is it unsafe for the circuit breaker to use it to protect against excessive DC current when it was designed for much less AC current?

I recently purchased a few of these capacitors:

http://www.bgmicro.com/01uf4000wvdc.aspx

They are labeled:

3460M103K

.01 MFD

4000 WVDC

43-7611

They have no arrows, no + or -, both leads are the same length, both wires go into a blue plastic insulator on the side. It is rated in DC volts so it's polarized, right? How do I test it to see which side is + and which is -?

Thanks in advance,

-Sam

I have a solar cell hooked up to an oscilloscope and the wave form is a sine wave at 120 htz. The only serious light source are the CFLs in the light on my ceiling. I know the wall is 120VAC at 60 Htz so why are my lights twice that?

Thanks

-Sam

120VAC into the primary of an MOT gives 2000VAC on the secondary. People often remove the secondary and replace it with a few turns of heavy wire to a create low voltage and high current spot welder. Could I simply hook the secondary to 120VAC and use the primary as low voltage, high current? What could go wrong?

I know if i have a 1:10 transformer with 10VAC on the primary, I'll get 100VAC on the secondary. Can I put that 100VAC into the primary of another 1:10 transformer and get 1000VAC?

Schematic:

http://dl.dropbox.com/u/1462842/Screen%20shot%2020...

I can understand variable power supplies having 2 channels for different output voltages but why do some single-output power supplies have 2? I have a 24V power supply with -V -V +V +V. are they isolated? can I hook them up in series and get 48V?

I know that applying a voltage higher than the voltage rating on a capacitor can destroy it but if I have an ultracapacitor, which charges slowly with the power supply I have, can I apply twice the voltage and then disconnect it once it reaches the limit?

More info: I have a 2600 farad capacitor rated at 2.5 volts. My power supply can supply 0-15 volts at 3 amps. Charging it at 2.5 volts would take a while but charging it at 15 volts might be faster (but possibly hazardous). Should I stick with 2.5 volts or can I charge it at 15 volts if I keep an eye on it?

Thanks

-Sam

http://farm6.static.flickr.com/5124/5374127094_ea9...

Should I be worried?

i would like to design circuit boards for a living and want to know what steps i should take to get there.

1. should i look into computer or electrical engineering?

2. what are some good colleges for said major in the USA?

3. what are some classes i could take within that major to focus specifically on circuit board design?

thank you very much. you may end up deciding my future

:-)

thanks again

-sam

For a few years now I have had a compulsive urge to stretch my neck, back, wrists, and ankles every few minutes. It used to be less often but it's been getting more frequent as time goes on. (I stretch my neck side to side. Not up and down or twisted)

Stretching my ankles, wrists, and back aren't as annoying as I can hold off for a few moments until it is unnoticeable to stretch but my neck is more embarrassing and noticeable.

This feeling resembles the feeling of restless leg syndrome. Kind of itching sensation that causes me to strain or stretch.

I am worried that doing this, especially to my neck, will cause long term injury. A few times while stretching, my neck has cracked or popped. I don't think this is a good sign.

Thank you for your time

-Sam