Re: For those who believe in electricity

On 4/7/2025 11:56 AM, sms wrote:

On 4/7/2025 8:16 AM, Zen Cycle wrote:

On 4/6/2025 10:22 PM, Frank Krygowski wrote:

 <snip>
 A battery puts out DC, it does not provide "half of a sine wave."
 An LED dynamo light would be rectifying the AC into DC, though there are ways around this if the light has multiple LEDs (two LEDs each conducting for half the cycle). If there is only a single LED it can still be powered by the AC from the dynamo but it would be wasteful as it would only be lit for half the cycle.

First, here's what I said: "I had hoped to diagnose it using DC, figuring a 6 volt battery would essentially supply half of the sine wave so half of the input circuit. That naturally works with incandescents, and it worked with one Avenir LED dyno headlight that I repaired."
My reference to "essentially half the sine wave" meant that electron flow from a DC battery would be in the same direction as the flow during half the sine wave, and might serve to determine what part of the circuit was open.
And as I said, the DC source has worked with other LED dyno headlights. It works with the Avenir I own, it works with a B&M Lyt that I just tested. Both are single LED headlamps. It didn't work with the B&M Eyc I'm trying to repair. But maybe that's related to its inconsistent and intermittent fault.
As I mentioned in discussions here years ago, one LED dyno headlight I own has a very simple circuit: IIRC just a bridge rectifier, a voltage regulator, a resistor and a capacitor feeding one LED.
It's obvious from my photos of this B&M lamp that the electronics are much more complicated. I'm disappointed that the electronics experts here have never commented on what the likely functions of all that complexity.
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- Frank Krygowski