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From: Frank Krygowski <frkrygow@sbcglobal.net>
Newsgroups: rec.bicycles.tech
Subject: Re: For those who believe in electricity
Date: Tue, 8 Apr 2025 12:35:27 -0400
Organization: A noiseless patient Spider
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On 4/7/2025 6:16 PM, sms wrote:
> On 4/7/2025 9:28 AM, Zen Cycle wrote:
> 
> <snip>
> 
>> "PWM DC"? PWM by definition isn't DC. PWM generators even at maximum 
>> drive aren't 100% duty cycle (yes, effectively DC considering the 
>> response of the LED, but still not exactly DC).
> 
> Yes. PWM is a DC voltage with varying pulse widths. It never goes below 
> 0V like AC.
> 
> BTW, Frank could have just used a transformer like <https:// 
> www.amazon.com/dp/B094NRRKC1> to simulate a 6VAC dynamo, or even a 
> 16-24VAC doorbell transformer with some resistors to divide the voltage 
> and limit the current...

I considered that. I'm not an electronics guy, so I didn't want to get 
into calculations to mimic the current limiting reactance of a typical 
bicycle dynamo. It was easier to chuck a roller into my drill press and 
use it to drive an actual dynamo.


-- 
- Frank Krygowski