 | | Re: Need Electrical Help —Mathew Clayson
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| | | (...) If the voltage is going to vary, don't use a resistor as current source, consider a current regulator instead. That way the LED stays brightly lit over a wide voltage range without getting burned out at max voltage. This works for one or more (...) (16 years ago, 24-Oct-08, to lugnet.trains)
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| | | | | Re: Need Electrical Help —Rob Hendrix
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| | | | (...) Great idea. I hadn't thought about whether Tom was going to use a variable speed control. I just assumed batteries for some reason. Have you had any brightness issues with the seemingly low 15mA output for multiple LEDs or are you hooking 1 to (...) (16 years ago, 24-Oct-08, to lugnet.trains)
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| | | | | | Re: Need Electrical Help —Mathew Clayson
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| | | | | (...) Hey Rob, It would be safer to place a regular doide in series with this if the voltage is going to be reversed some of the time. But the circuit shown in the link handles reverse voltage up to 9v fine. The LED acts as a reverse protection (...) (16 years ago, 24-Oct-08, to lugnet.trains, FTX)
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| | | | | | | Re: Need Electrical Help —Tom Keenan
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| | | | | | I appreciate all your suggestions. Is there a website you can suggest that has more information on this stuff? Also, beside Jameco, what are some othe good places to buy parts? Thanks, Tom (16 years ago, 25-Oct-08, to lugnet.trains, FTX)
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| | | | | | | | Re: Need Electrical Help —Wayne Jackson
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| | | | | | (...) Farnell, Sparkfun, DigiKey, Radio Shack (Tandy/Dick Smith for AU crowd), Mouser (16 years ago, 26-Oct-08, to lugnet.trains)
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| | | | | | | | Re: Need Electrical Help —Tom Keenan
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| | | | | | (...) THANK YOU! (16 years ago, 2-Nov-08, to lugnet.trains)
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| | | | | | Re: Need Electrical Help —Wayne Jackson
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| | | | (...) As a crazy idea, use a MAX882/3/4 configured to output the required voltage. It is a step-up regulator that will work with as little as 1.5 volts. There are also PWM solutions. (16 years ago, 26-Oct-08, to lugnet.trains)
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