[Solved] Dropping molex voltage to 9v

hey guys... my old account was pruned for inactivity so i'm starting new haha. i am not sure if this is the appropriate area for this post, so please move it if you see fit. basicly i am trying to do this: http://www.overclock.net/case-mods [...] e-dvd.html .

i have everything except i am lost as far as the whole diode and resistors part is concerned. i am wondering if anyone could give me a crash course in what i am looking for in these two departments as far as radioshack goes... i just got back from there and it was OVERWELMING how many different diodes and resistors they had haha.

What is the exact resistor and what are the exact diodes i need for this project?

Thanks,
Nick

alright. thanks for the info shadow. however i have come to realize in the tutorial he says that each diode will reduce the current by .7volts... sounds good. now i just need to know what diode out of the 20 they have at radioshack to buy

Just get a 7809 IC a +9 V regulator). It has 3 wires. (1) input - Connect +12 Here. (2) Ground (also is connected to metal tab and is heat sink). (3) output - Regulated +9 V. PS should onl be a couple of bucks, but have not bougth for a while and Radio shack did carry. Wattag on 7809 = 3 Volts times load curret, ie 500 mills x 3 volts = 1.5 Watts should be no problem.

Ref to Diodes. Must be Si and not Ge as Forward voltage drop for Ge is only +0.3 Volts

Added as to Resistors - Looking at them (without calculating) 1/4 W should be fine.

As to leds, yes forward E drop is approx 1.4 V @20 to 30 Mills, They do not like high current like 100 mAmps. They tend to glow just before winking out.