my LEDs kinda strobe


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f1xrupr
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Motorcycle: 1980 gl 1100 Std. Vetter

my LEDs kinda strobe

Postby f1xrupr » Fri Oct 30, 2015 6:01 pm



Gl1100-been changing over to LEDs, and I notice they kinda flicker a little relative to the charging system. It is really noticeable on my LED fog lights-it's like it needs a capacitor. I was just wondering if anyone else noticed that with your bike? I don't think it will bother my vision, and I guess it will make me more noticeable. It didn't do it with the tungston bulbs.


My exercise bike is a goldwing.

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virgilmobile
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Re: my LEDs kinda strobe

Postby virgilmobile » Fri Oct 30, 2015 6:47 pm

Is this just most noticable near the idle to 1500 rpm range or all the way?What is the battery voltage at a idle and 3k rpm.?
There is a pulsing generated by the charging system..it is a AC device that is rectified and "filtered" by the battery.
The regulator does constantly switch on and off to do its job to keep the volts stable...remember that LED turn on and off very fast compared to a incandescent lamp (there slow to warm up and cool off)so slight changes in voltage will show easier.
You may also go over the battery ground cable at both ends as well as the regulator ground,dog bone fuse,2 big red wire connections,etc,etc.

f1xrupr
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Re: my LEDs kinda strobe

Postby f1xrupr » Fri Oct 30, 2015 7:15 pm

Yeah... I get what you're saying. I just took it for a spin in the dark-I can't notice it at all from the cockpit (while I'm riding that is). I'm well maintained on my conections,but my battery is old. It would seem that the battery should have the capasidence to filter it out. You know, it don't seem to pulse relative (directly) to rpm-could be the rr. It's probably the sensitivity of the LEDs.....it's just something I noticed......
My exercise bike is a goldwing.

f1xrupr
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Re: my LEDs kinda strobe

Postby f1xrupr » Sun Nov 01, 2015 6:23 pm

Ok-so I just Googled "LED flicker....", and it's all over the internet for low and high voltage applications.
I ordered me a standard alt capacitor-going to try connecting it to my charge wire at my rr. Less than 7.00 on ebay.
My exercise bike is a goldwing.

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virgilmobile
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Re: my LEDs kinda strobe

Postby virgilmobile » Mon Nov 02, 2015 10:22 am

If it doesn't stabilize it there,hook it as close to the led,s as possible.

f1xrupr
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Re: my LEDs kinda strobe

Postby f1xrupr » Mon Nov 02, 2015 10:47 am

virgilmobile wrote:If it doesn't stabilize it there,hook it as close to the led,s as possible.

Yeah, I agree.
I wonder-since there's evidently not a "flat" dc flow, I think it's safe to assume that-a DVM registers at the highest point of the sine, and the system may not be charging as good as we think! I wonder if the factory rr even has a capacitor in it? I'm excited to try it (it's not that I have charge problems)!....it may prove beneficial!
I do have a concern however-capacitor discharging upstream.
A diode for safety would prove effective if "needed".
But then of course-there's a power lose for the diode (but I think only if it switches).
One would assume that, the diodes within the rr would suffice....any thoughts?
My exercise bike is a goldwing.

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virgilmobile
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Re: my LEDs kinda strobe

Postby virgilmobile » Mon Nov 02, 2015 11:11 am

Don't know about the r/r module having caps,I would think so to stabilize the ripple for the regulator part.The battery is the real capacitor.
A diode would drop the volts by 0.6 volts or so.Power going through it is the problem.
Having a cap close to the lights will actually help to slow the on/off switching.LED lighting tend to crash with voltage spikes.

f1xrupr
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Re: my LEDs kinda strobe

Postby f1xrupr » Mon Nov 02, 2015 11:21 am

virgilmobile wrote:Don't know about the r/r module having caps,I would think so to stabilize the ripple for the regulator part.The battery is the real capacitor.
A diode would drop the volts by 0.6 volts or so.Power going through it is the problem.
Having a cap close to the lights will actually help to slow the on/off switching.LED lighting tend to crash with voltage spikes.

I agree.
I'm thinking I might benefit more by putting it close to the rr, and was wondering about any potential adverse effect by placing it there...
My exercise bike is a goldwing.

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virgilmobile
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Re: my LEDs kinda strobe

Postby virgilmobile » Mon Nov 02, 2015 12:18 pm

Depends on the cap ratings.
It needs to absorb voltage spikes (ripples) and should be rated at 125% above that.Then there's the capacity.As large as possible.
Hooking it to the r/r module would be very close to the battery.Im not sure you'll see much benifit.Try it tho.If the pulsing is still apparent,attach it to the wire feeding the led's.Theres always more loss in the little wires than those big #12 red ones and easier to stabilize.
Some have go as far as building a Filter network.A couple of caps on either side of a low resistance coil to level the volts out.

f1xrupr
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Re: my LEDs kinda strobe

Postby f1xrupr » Mon Nov 02, 2015 12:41 pm

virgilmobile wrote:Depends on the cap ratings.
It needs to absorb voltage spikes (ripples) and should be rated at 125% above that.Then there's the capacity.As large as possible.
Hooking it to the r/r module would be very close to the battery.Im not sure you'll see much benifit.Try it tho.If the pulsing is still apparent,attach it to the wire feeding the led's.Theres always more loss in the little wires than those big #12 red ones and easier to stabilize.
Some have go as far as building a Filter network.A couple of caps on either side of a low resistance coil to level the volts out.

....."low resistance coil"....are you referring to an inductor?
My exercise bike is a goldwing.

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virgilmobile
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Re: my LEDs kinda strobe

Postby virgilmobile » Mon Nov 02, 2015 12:47 pm

Yes.Built like a noise suppressor,just larger caps.

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Re: my LEDs kinda strobe

Postby f1xrupr » Mon Nov 02, 2015 1:17 pm

virgilmobile wrote:Yes.Built like a noise suppressor,just larger caps.

I found that on Google-Bachmann Heisler noise suppression....I think I'll just try 1 cap.
Kinda funny-in my simple brain, that kinda seems like a resonant (tank) circuit.
My exercise bike is a goldwing.

f1xrupr
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Joined: Mon Jan 13, 2014 6:13 am
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Re: my LEDs kinda strobe

Postby f1xrupr » Thu Nov 05, 2015 3:09 pm

Ok...I had ordered that capacitor from ebay, and today I got a message that,"the seller issued you a full refund", but the funny thing is-I didn't ask for one! Turns out I didn't need the cap anyway!
I took time today to do some checking.
My bike is a standard, with a Vetter farring. I have it wired to the assesory terminal at the fuse block. My fog light circuit comes from the farring (LEDs). I also am using a pulsating type electric fuel pump, which is also connected to the accessory terminal. That's where the "flicker" is coming from. I didn't catch it earlier because, the fuel pump has a oil pressure switch in its circuit (not the oil light switch), so the fuel pump only stays on while the engine is running!
If it don't blow bulbs, I'm going to leave it like that for added visibility ( seen by other drivers).


My exercise bike is a goldwing.


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