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Will 5v to the ground... EE help with RGB Topfire... see post #22

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DaOld Man:

I think using an opto-isolator to replace the relay in popcorrin's circuit would be by far the easiest and cheapest way to do this.

Edit:
Does the led wiz have a ground on it? If so the led of the opto isolator needs to connect to it. (pic posted)

Bender:

Transistor no good? I already got one of those :-\

Yes the LEDWiz does have a ground

more quick and dirty please >:D

seriously more quick and dirty pics (nice already done)

What size resistor?
what kind of opto-isolator?

DaOld Man:

This might work


Bender:

sorry to be so dim, could you label the BCE on the transistor
Can't thank you guys enough :applaud: :applaud:

oh yeah, and what size resistor

DaOld Man:

Im not real sure about resistor size, maybe 1000 ohms?
Before you do this, make sure that both devices, led wiz and minipac, have the same power supply ground feeding them.
Both supply grounds need to be negative. And there should be no voltage between them.
If you are feeding both from a 5 vdc power in your computer, you should be ok.
I just dont want to see you fry something expensive.

I still think opto isloator would be the best way to go with this.
Both circuits would be isolated from each other.

Also:
With the transistor, you may have to add another higher value resistor from base to emitter to prevent mis-fires.
This "bias" resistor would pull the base to ground, to keep it turned off until the + 5v is applied via the pushbutton.

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