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Main => Main Forum => Topic started by: dcware on July 04, 2004, 06:12:39 pm

Title: I-Pac LEDs
Post by: dcware on July 04, 2004, 06:12:39 pm

what kind of circuit would i need to make the iPAC able to power 12v bulbs instead of 5v LEDS? My coin mech and start buttons use 12v bulbs.

I don't care how advanced it is, and i'm willing to take risks.

Thanks,
DCWare

Title: Re:I-Pac LEDs
Post by: RayB on July 04, 2004, 06:27:57 pm

I don't know that much about electronics, so I may be wrong in saying this, but you can't INCREASE a voltage from 5 to 12.

Title: Re:I-Pac LEDs
Post by: dcware on July 04, 2004, 06:29:54 pm

I mean some sort of circuit so that the 5v current turns the 12v current on. I've seen it on Mameworld a long time ago but cannot find now.

DCWare,

Title: Re:I-Pac LEDs
Post by: bdsjake on July 04, 2004, 06:32:48 pm

its on oscar's website:

www.oscarcontrols.com

Title: Re:I-Pac LEDs
Post by: dcware on July 04, 2004, 06:42:22 pm

thanks for the useful link but that still outputs at 1.9 volts only a higher amp.

Title: Re:I-Pac LEDs
Post by: Bgnome on July 04, 2004, 07:09:41 pm

Quote from: dcware on July 04, 2004, 06:29:54 pm

I mean some sort of circuit so that the 5v current turns the 12v current on. I've seen it on Mameworld a long time ago but cannot find now.

DCWare,

use a relay.  get one thats normally open, hook it to the 12v line and your lights, then hook the 5v from the ipac to it.  whenever the ipac leds want to light up, it will turn on the 12v line..
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F011%5F002%5F013%5F000&product%5Fid=275%2D232
im not completely sure about how the specs work for these but i believe that one operates with 5v for the switch part..

Title: Re:I-Pac LEDs
Post by: SoundDoc on July 05, 2004, 02:00:15 am

You can use the design at Oscars site for the Ipac LED Interface. 3 transistors is a lot cheaper than relays, and I doubt you need to switch 5 or 10 amps. a standard transistor should be good for a couple of bulbs. 1K resistor between the ipac output and the base of the transistor, 12V from the PC, (same connector pin on the other side) to the emitter, and from the collector, forget the resistor, go straight to the bulbs, then to ground (common ground with PC PSU.
Should be fine.
If you want to go with relays, forget a standard relay at 5V as it will draw more current than a led on the IPAC, you would still need the circuit, again minus the resistor on the collector to drive the relay. You could use a 5vdc Reed relay though, digikey is the cheapest at around $8-9 each, and they draw down around 15-20ma, which should be ok on the IPAC.
I'd just use a couple of transistors though.

sd