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From: Zen Cycle <funkmaster@hotmail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: bike light optics
Date: Tue, 9 Apr 2024 08:36:46 -0400
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On 4/9/2024 1:57 AM, Jeff Liebermann wrote:
> On Fri, 5 Apr 2024 09:36:27 -0700, sms <scharf.steven@geemail.com>
> wrote:
> 
>> What would be nice is a higher-end battery powered light that could be
>> charged with a dynamo, and operate at lower power directly from the
>> dynamo, but there is no such animal. A dynamo to USB-C PD adapter would
>> be perfect but all the dynamo USB commercial products are to 5VDC only.
> 
> Good idea, but the dynamo might need to be enlarged to handle the
> combined load of charging the battery and powering the light.  It is
> possible to do both with the existing 3 watt dynamos using PWM (pulse
> width modulation), where the waveforms for powering the light and
> charging the battery are interlaced so that the dynamo sees only one
> load at a time. 

I don't think I've ever heard of a PWM multiplexing scheme before. Is 
there such a thing?

Maybe you can build mux a cable tester in there too.