Jordan&tiffany

Hello RFamateur

and welcome to the form.

Here are a few.
These have stuff some good lot outdated.

http://www.goldmine-elec.com/default.htm
http://unicornelectronics.com/prod.htm
http://www.mpja.com/category/LEDs/LEDs.asp
http://www.futurlec.com/index.shtml
http://www.allelectronics.com/
http://www.danssmallpartsandkits.net/
http://www.alltronics.com/assortments.htm


These are good suppliers
http://www.mouser.com/index.cfm?handler=home
http://www.futureelectronics.com/en/Pages/index.aspx
http://www.web-tronics.com/
http://www.jameco.com/webapp/wcs/stores/servlet/StoreCatalogDisplay?storeId=10001&catalogId=10001&langId=-1

        That should get you going.

                        gogo

Here is the book in pdf for you all. You can press the free button and you have to wait about a minute then it gives you the links. Just pick one.

http://rapidshare.com/files/3372603/Practical_Electronics_for_Inventors.pdf

After running across this at the public library in town, I just had
to order my own copy:
"Practical Electronics for Inventors"  by Paul Scherz

It covers just about everything from DC to Microcontrollers and is well illustrated.

http://www.metalstorm.com/

[i would not encourage children to develop high tech weaponry and would firmly discourage them from using them on themselves or others.]  I saw a project online once that took a page from the XREF taser shotgun rounds, concept.  It used pressurized air to propel a charged disposable camera capacitor, prongs first out of a simple barrel.  Interesting concept, though from what I read, the 330V would be far to little to achieve the taser effect.  That and I understand a specific waveform is needed to affect strictly skeletal muscle and not cardiac muscle.  Seems like a safety concern to me.

Hi Shantanu,
Electrolytic capacitors have a vent on top to slowly release gasses that build up when the capacitor is connected with backwards polarity then has a high current.
With a very high current, the vent cannot release the gasses slowly so the capacitor explodes.

A 9V battery cannot provide a very high current. Maybe a battery made with series-connected AA Ni-Cad or Ni-MH cells would provide enough current for a backwards electrolytic capacitor to explode. Bad-smelling "fluff" comes out.

I have a 12v transformer for interior lights and a few lights for it, but want to make it a dimmer light. the working amps are 250mA.

I would like to know how to wire up these three ways, so i can try each one and see if its any good and use the best....

Touch lamp. touch the metal to turn on dimmest. press again for brighter and again for brighter and again for off.

Manual pot adjuster.

and digital potentimeter. press up to turn up and make brighter and down for darker / off, and a reset button to turn instant off.

Any help and sche... will be helpfull.
Thanks in advance

I have some questions I was hoping someone would help me work through. I am building an outdoor fountain that I want powered by a solar cell. Can I run the solar cell wires directly into the BLDC motor and have it operate only when sun is shining? The brighter the sun the faster the motor turns. Or do I need more circuitry to make it work?

If I do hook up a small 3.7 v  2000 mAh Li Ion battery, I need a charge controller? And what?
Pump
Voltage VDC - 6.0 Nominal
Current Draw: 0.27 Amps
Power Usage: 7.0 Watts
Solar cell
Output Voltage: 0.5 volts (Vmax)
Output Current: 3.5 Amps (Imax)
Average Power: 1.75 Watts

Is there any way to turn the motor on for 1 minute every hour on the hour? Miniature controller or driver of some sort? System as compact and concealable as possible. Any help out there For this one?

Oh one more thing, is there a micro charge controller out there that would protect the battery when it was full by dumping the load into some LED’s or something of that nature?