+5V from a psx pad to P360?

[mrbasdf]

I just finished wiring my new arcade stick, and I ran into a problem. This is the first time I've used a P360 stick, and I know that they need +5V. I found a point on the psx pad where i can get +5V, but when I wire it to the P360, nothing seems to work. I checked it with a volt meter, and it only shows about 1.5 volts. When i take the wire off, the buttons work again. Is there a certain point on the controller where i can get the needed volts, or do I have to use an external power supply?

[AlanS17]

Are you using a digital or analog controller?

[mrbasdf]

I'm using an analog controller, Mad Catz brand.

[IIOIOOIOO]

Pretty sure that you want to use a digital PS1 controller, so that the button circuits aren't all dragging. Let us know though, as I am about to approach a side project and that info will be useful.

[grafixmonkey]

The controller probably can't supply enough current through the pin you found, to power the p360.  (if that's the case, the voltage drops when you plug it in.  And sometimes things start frying, but not always...)

If you find a 5v pin that's directly connected to the 5v lead of the USB port, then it should work from there.  Look over close to where the USB wire comes in, and test things directly connected to the wires.

[mrbasdf]

http://www.gamesx.com/controldata/psxcont/psxcont.htm

According to that site, the VCC pin has 5V. Are you saying that I should connect a wire directly to that pin?

[grafixmonkey]

Yes, that VCC pin is what  you should tap.  That wire, directly, or a trace on the controller board that's directly connected to it.

VCC refers to whatever voltage supply is in a circuit that corresponds to logic-high...   5v in this case, but there are circuits where VCC is 3v or even 1v with some new chips I've seen.  (so vcc doesn't always mean 5v...  just to be clear)

What I'm guessing is going on with the voltage drop is that either something is shorted out, or an LED is between vcc and ground with no resistor,  or you tapped a pin that's being held at 5v, but isn't directly connected to the VCC power line.  (like a logic high coming from a chip).