Confused Beginner
Posted: Fri Feb 02, 2007 9:42 am
Hi,
I'm a complete novice and I'm trying to build my first mecahnical television. I'm using a Peter Smith design (from the NBTVA website http://www.nbtv.wyenet.co.uk/beginners.htm )
However, I'm confused to tha choice of resistors used in the LED arrays. The circuit shows 2 rows of 3 LED's in parallel, each row with a 22R resistor in it. If the supply voltage is 12V, the LED's 2V 20mA I work out that the 2 resistors need to be 330R. Am I right or am I missing something?
Many Thanks
David
I'm a complete novice and I'm trying to build my first mecahnical television. I'm using a Peter Smith design (from the NBTVA website http://www.nbtv.wyenet.co.uk/beginners.htm )
However, I'm confused to tha choice of resistors used in the LED arrays. The circuit shows 2 rows of 3 LED's in parallel, each row with a 22R resistor in it. If the supply voltage is 12V, the LED's 2V 20mA I work out that the 2 resistors need to be 330R. Am I right or am I missing something?
Many Thanks
David