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Post by JohnnyBlue on Feb 23, 2010 12:31:45 GMT
I replaced the LED and since then the NiMH batteries seem to be holding up much better: I've already got twice as much playing time as previously, and they're still going strong (and they're only on their third charge/discharge cycle).
I know that diodes only let electricity flow in one direction, and that light-emitting ones, er , emit light. But what happens when they are broken/fused (in my case, by shorting across the LED's terminals when the amp was on)? Could this broken LED have led to a power drain, causing the batteries to flatten prematurely?
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robertkd
Been here a while!
Electronics Engineer from sunny Queensland
Posts: 111
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Post by robertkd on Feb 23, 2010 12:57:51 GMT
Simple answer yes! I might suggest you change the 1Kr (1000 ohm) resistor to a 10K, this will reduce current draw substantially form about 15mA to about 2mA which will increase battery life, doing so will substantially dim the LED as well. For me the LED is a power waster doubly so on the small 9 V NiMH.
You will also see improvements of the battery capacity over the first few charge/discharge cycles that's fairly normal.
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Post by JohnnyBlue on Feb 23, 2010 13:23:30 GMT
Thanks for the tip: the LED is very bright! I had assumed that increasing the resistor value would dim the bulb but not reduce battery drain (as you can see, my knowledge of electronics is very limited!).
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Post by JohnnyBlue on Feb 25, 2010 17:20:33 GMT
Just when I was going to sit back and enjoy the fruits of my labour, I get this message on another forum! Aaaargh!
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