is there a way to draw 9v current from a molex connector?

[pen^2]

if there is a way, please let me know; that would help me drastically on battery hassle/expenditure on my headphone amp...

 

[pen^2]

found it! google rox

 

[TunaBoo]

Ya just take the 12V line and drop it to 9V.

 

[ThisIsMatt]

9v current? 9v.

 

[Bozz]

The author of that article isn't too cluey on how much CURRENT the negative voltage rails on a typical PS will give, usually it is in order of half an amp... put more load than that on the rails and often the supply's protection circuits will stop it from firing up.

So what does this mean? Dont try to power an amplifier from the negative rails. Those negative rails are rarely used by computers anymore, they were implemented in the old days for RS232 and RS434 communications that required positive and negative signals. The motherboard doesn't use the negative rails, but they are supplied to all the slots in case a card requires the use of one.

Cheers

 

[Xe0n]

all electronics sells 12v to 9v converters..

http://www.allelectronics.com/cgi-bin/category.cgi?category=search&item=DC-18&type=store

 

[lotust]

i know how to make 7v but you really need 9v?

to get 7v you use the yellow=pos and red=neg that makes 7v

edit: yes allelectronics rules!! some stuff is dirt cheap

 

[Bozz]

A dead simple solution would be to get a few power diodes and connect them in series with the 12V line, a power diode will drop approximately 0.5v under load so 6 of them will bring it down to the required 9volts needed, simple cheap and effective.

 

[Bozz]

Or a 7809 voltage regulator from any electronics tech store, without a heatsink it will give up to 100mA, with a heatsink it can supply just over an amp continuously, email me if you want more info.