PDA

View Full Version : Power Conversion from jamma harness.



Berty
28th June 2006, 03:16 PM
Hi,

I need some pointers on how to(i.e. what i need) to derive +5v, +9v, + 3.3v solely from the jamma edge connectors. I know that 5v is no probs though :p

The load is only 0.3amps on 9v and about 0.6amps on the 3.3v line. Also, anything i do is strictly size limited so the smaller i can do this, the better.

MadMikeAU
29th June 2006, 06:42 AM
If its on a circuit, you could use power regulator ICs ... 7809 will give exactly 9V from the 12V line. Dunno if you can get a 7803 for the 3V.

These things are only 3 pins...input voltage (must be more than what your after), output voltage and common (ground).

For the 3.3V, you could use a LM317T. Same as above, but can be adjusted to the exact voltage you're after.

Dick Smith has both kinds of regulators quite cheap (7809=$1.20, LM317T=$2.10).

Most arcade and console PCBs use the 7805 to get exactly 5V. You will often see a fuse put just before the input voltage, because these things can only handle 1A.

Berty
29th June 2006, 09:01 AM
Thanks mate, looks alot easier now.