1. I want explain of (Frequencies Bands)?
2. AC and DC?
3. I want simple circuit because i want to learn how to soldering ...etc?

sorry for this request because i am new in this field

 

1.

http://www.daviddarling.info/encyclopedia/F/frequency_bands.html

http://www.altair.org/labnotes_RadioBands.html

2.

http://www.allaboutcircuits.com/vol_1/index.html

http://www.allaboutcircuits.com/vol_2/index.html

3.

http://wild-bohemian.com/electronics/flasher.html

http://www.allelectronics.com/cgi-bin/item/LEDKIT/305/LED_FLASHING_KIT_.html