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So  I replaced the lights on my Mth subway train, But for some reason there is a weird "Buzzing" sound when I run the train along the tracks and some flickering, But I did install a capacitors, Although im not sure if it does the trick, its a 220uf 35v capacitor. Is it because the LED draw more power then incandescent bulbs?. Watch video to see what it does.

https://flic.kr/p/nsAD6F

 

Last edited by nycboy
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Originally Posted by nycboy:
The strips are meant to flex, and the sound is coming from the pick up dollars. If I cut the voltage down to 11-13volts on my cw-80 the sound is gone but the lights are very dim. I don't think it's.operating at 24 volts cause then the leds would pop

Are you using a single diode (ie a half wave rectifier) in your circuit? Or are you using a full wave bridge rectifier?

Originally Posted by nycboy:
The strips are meant to flex, and the sound is coming from the pick up dollars. If I cut the voltage down to 11-13volts on my cw-80 the sound is gone but the lights are very dim. I don't think it's.operating at 24 volts cause then the leds would pop

Are you saying that the sound is coming from the centre rail pickup rollers?

 

if so, then I would think that you might have a bad or dirty connection there, and the extra current draw is causing some arcing. Have you tried thoroughly cleaning the pickups, and checking for good connections? (Under load) 

Originally Posted by gunrunnerjohn:

If the pickups are making that sound, I can only guess you're drawing more current than is good for the LED's!  I have a bunch of passenger cars with those strips with proper current limiting, and I've never heard them scream for mercy as they roll.

 

Are you using a resisitor or a voltage regulator or LM2596 Module?

Originally Posted by gunrunnerjohn:

If there's that much repeated inrush current to the cap, a lot of current is being consumed by the lighting.  Given that these LED strips should be using a maximum of 20ma for every three bulb group, I'd suspect that means they're getting way more power than they are rated for.

 

So I should do one of these 2 things?
Remove the capacitor Or

Reduce the amps coming to the LED lights? If so what Would I use to reduce amps but not voltage, If thats possible.

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