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LED support with Hagstrom KE72 (pics)
Sasquatch!:
--- Quote from: RandyT on March 01, 2003, 01:43:32 pm ---I just want to give you guys a "heads up" on this. 1.5ma is virtually nothing when being considered for driving LEDs.
Fortunately, the write-up Kelsey so graciously provided for boosting the LEDs on the IPAC should also work for the KE72 as both are "active-low". You might have to change the value of the resistors that sit between the output of the KE72 and the LED driver board though.
But if you are thinking that sending your KE72 back in for this connector will keep you from having to solder, I'm afraid that won't be the case in the end. You'll still have more to do afterwards unfortunately.
Just trying to save someone some money in case they didn't quite understand the LED situation with this card.
RandyT
--- End quote ---
Randy,
Thanks for the info. I'm figuring on still using Oscar's writeup if I go with super-bright LEDs, since his scematic only used the IPAC for controlling (and not powering) the LEDs.
BTW, I know that the KE72 is 1.5ma...what's the IPAC?
My understanding (and please correct me if I'm wrong) is that I would be able to use the KE72 "as is" with standard LEDs (much like the IPAC), but I'd have to have a driver (like Oscar's plan" for super-bright LEDs. Correct?
Thanks again.
RandyT:
--- Quote ---[quote author=Sasquatch! link=board=1;threadid=5322;start=0#35358
BTW, I know that the KE72 is 1.5ma...what's the IPAC?
My understanding (and please correct me if I'm wrong) is that I would be able to use the KE72 "as is" with standard LEDs (much like the IPAC), but I'd have to have a driver (like Oscar's plan" for super-bright LEDs. Correct?
Thanks again.
--- End quote ---
I can't answer this with 100% accuracy but from what I know about the hardware driving the IPAC, I'm guessing it puts out at least 10ma, which is quite a bit more than what you are dealing with.
That's why you might have to use different resistors with Oscar's circuit.
If you want to use it "as-is" the LEDs you can use won't have a lot of output. Also, if you try to overdrive it with brighter LEDs, you can damage the controller.
RandyT
Sasquatch!:
--- Quote from: RandyT on March 01, 2003, 04:12:30 pm ---I can't answer this with 100% accuracy, but from what I know about the hardware driving the IPAC, I'm guessing it puts out at least 10ma, which is quite a bit more than what you are dealing with.
That's why you might have to use different resistors with Oscar's circuit.
--- End quote ---
AHA! You're online right now! ;)
But again, isn't Oscar's plan only using the IPAC (in my case, it would be the KE72) for the signaling, and not to power the LEDs? So why would it matter?
RandyT:
--- Quote from: Sasquatch! on March 01, 2003, 04:14:25 pm ---
--- Quote from: RandyT on March 01, 2003, 04:12:30 pm ---
That's why you might have to use different resistors with Oscar's circuit.
--- End quote ---
But again, isn't Oscar's plan only using the IPAC (in my case, it would be the KE72) for the signaling, and not to power the LEDs? So why would it matter?
--- End quote ---
The resistors limit the current going to the transistors. If the resistance is too high for the weaker output, there might not be enough juice to turn on the transistor.
But then again, it might work fine :) You'll have to experiment or do some research.
RandyT
MannyTC:
Just got an email from Hagstrom and they added in my LED header and upgraded my firmware and shipped it back today. 1 Day turnaround!. Will let you all know how it works when I get it.